Communicating method and transmitting device
Abstract
This record has no abstract on file.
Term
Projected expiry 16 May 2028.
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16 claims: 4 independent, 12 dependent
- 1基地局から送信されるOFDM方式の信号を受信し復調する受信信号復調方法であって、前記OFDM方式の信号は、複数のキャリア群に対して、複数の端末宛の送信データが割り当てられ、前記複数のキャリア群の各々のフレーム構成として、1つの変調信号が送信される第1のフレーム構成、又は、複数の変調信号が複数のアンテナを用いて送信される第2のフレーム構成が用いられた信号であり、前記複数のキャリア群の各々は複数のキャリアを含むものであり、受信した信号に含まれる制御情報に基づいて、自己宛の送信データが割り当てられたキャリア群を特定し、前記特定したキャリア群について、前記第1のフレーム構成を用いて送信された前記1つの変調信号を復調することにより、又は、前記第2のフレーム構成を用いて送信された前記複数の変調信号を復調することにより、受信データを生成する受信信号復調方法。
- 2前記受信した信号から伝搬路状況を推定し、 前記推定した伝搬路状況に関する電波伝搬環境情報を前記基地局へ送信する 請求項1に記載の受信信号復調方法。
- 3前記電波伝搬環境情報は、受信信号電界強度、又は、チャネル状態情報である請求項2に記載の受信信号復調方法。
- 4前記変調信号は、前記複数の端末のいずれかに対する送信データを送信するためのデータシンボルと、前記データシンボルよりも時間軸において前方に配置され、前記変調信号を受信した端末が、前記送信データを復号する際に利用する制御シンボルと、を有する請求項1乃至3いずれか一項に記載の受信信号復調方法。
- 5前記変調信号は、前記複数の端末のいずれかに対する送信データを送信するためのデータシンボルと、前記データシンボルよりも時間軸において前方に配置され、時間同期、周波数オフセット、伝送路歪みの少なくともいずれかを推定するための推定シンボルと、を有する請求項1乃至3いずれか一項に記載の受信信号復調方法。
- 6前記OFDM方式の信号の受信は、複数の端末側アンテナを用いて行われる請求項1乃至5いずれか一項に記載の受信信号復調方法。
- 7前記第2のフレーム構成では、前記複数の変調信号が、前記基地局が有する複数の基地局側アンテナから送信される請求項1乃至6いずれか一項に記載の受信信号復調方法。
- 8前記第2のフレーム構成では、前記複数の変調信号が、前記複数の基地局側アンテナを用いて、同一周波数帯域で送信される請求項7に記載の受信信号復調方法。
- 9基地局から送信されるOFDM方式の信号を受信し復調する受信信号復調装置であって、前記OFDM方式の信号は、複数のキャリア群に対して、複数の端末宛の送信データが割り当てられ、前記複数のキャリア群の各々のフレーム構成として、1つの変調信号が送信される第1のフレーム構成、又は、複数の変調信号が複数のアンテナを用いて送信される第2のフレーム構成が用いられた信号であり、前記複数のキャリア群の各々は複数のキャリアを含むものであり、受信信号が入力される入力部と、前記入力部に入力された受信信号に含まれる制御情報に基づいて、自己宛の送信データが割り当てられたキャリア群を特定し、前記特定したキャリア群について、前記第1のフレーム構成を用いて送信された前記1つの変調信号を復調することにより、又は、前記第2のフレーム構成を用いて送信された前記複数の変調信号を復調することにより、受信データを生成する復調部と、 を具備する受信信号復調装置。
- 10前記受信信号から伝搬路状況を推定する伝搬路状況推定部と、 前記推定した伝搬路状況に関する電波伝搬環境情報を前記基地局へ送信する送信部と、 をさらに具備する請求項9に記載の受信信号復調装置。
- 11前記電波伝搬環境情報は、受信信号電界強度、又は、チャネル状態情報である請求項10に記載の受信信号復調装置。
- 12前記変調信号は、前記複数の端末のいずれかに対する送信データを送信するためのデータシンボルと、前記データシンボルよりも時間軸において前方に配置され、前記変調信号を受信した端末が、前記送信データを復号する際に利用する制御シンボルと、を有する請求項9乃至11いずれか一項に記載の受信信号復調装置。
- 13前記変調信号は、前記複数の端末のいずれかに対する送信データを送信するためのデータシンボルと、前記データシンボルよりも時間軸において前方に配置され、時間同期、周波数オフセット、伝送路歪みの少なくともいずれかを推定するための推定シンボルと、を有する請求項9乃至11いずれか一項に記載の受信信号復調装置。
- 14前記OFDM方式の信号の受信は、複数の端末側アンテナを用いて行われる請求項9乃至13いずれか一項に記載の受信信号復調装置。
- 15前記第2のフレーム構成では、前記複数の変調信号が、前記基地局が有する複数の基地局側アンテナから送信される請求項9乃至14いずれか一項に記載の受信信号復調装置。
- 16前記第2のフレーム構成では、前記複数の変調信号が、前記複数の基地局側アンテナを用いて、同一周波数帯域で送信される請求項15に記載の受信信号復調装置。
Independent claims16
495 paragraphs, as filed
The present invention relates to a terminal receiving method and a terminal receiving device.
FIG. 60 is a block diagram showing an example of the configuration of a conventional wireless transmitter and receiver. The modulation signal generation unit 02 takes the transmission digital signal 01 as an input and outputs the modulation signal 03.
The radio unit 04 receives the modulated signal as an input and outputs the transmission signal 05.
The power amplification unit 06 takes the transmission signal 05 as an input, amplifies the transmission signal 05, outputs the amplified transmission signal 07, and outputs the amplified transmission signal 07 as a radio wave from the antenna 08.
The radio unit 11 receives the received signal 10 received from the antenna 09 as an input, and outputs the received orthogonal baseband signal 12.
The demodulation unit 13 receives the reception orthogonal baseband signal 12 as an input and outputs the reception digital signal 14.
For example, there is a wireless communication method shown in Non-Patent Document 1.<nplcit num="1"><text>"Proposal of SDM-COFDM method for wideband mobile communication that realizes 100Mbit / s by MIMO channel" IEICE, IEICE Technical Report RCS-2001-135, October 2001</text></nplcit>
<p> However, in the conventional apparatus, a plurality of modulated signals are not multiplexed. Further, when a plurality of modulated signals are multiplexed and transmitted by the transmitting device, there is a problem that the receiving device needs to perform high-precision separation and demodulation when separating and demodulating the transmitted multiple modulated signals.</p><p> The present invention has been made in view of the above points, and an object of the present invention is to provide a terminal receiving method and a terminal receiving device capable of achieving both data transmission speed and transmission quality.</p>
<p> Of the present invention<u style="single">Received signal demodulation</u>One aspect of the method is the base<u style="single">Is it a station?</u>Will be sent<u style="single">OFDM method</u>Receive signal<u style="single">Received signal demodulation method to demodulate</u>And<u style="single">In the OFDM signal, transmission data addressed to a plurality of terminals is assigned to a plurality of carrier groups, and one modulation signal is transmitted as a frame configuration of each of the plurality of carrier groups. A signal using a configuration or a second frame configuration in which a plurality of modulated signals are transmitted using a plurality of antennas, and each of the plurality of carrier groups includes a plurality of carriers and is received. Based on the control information included in the signal, the carrier group to which the transmission data addressed to the self is assigned is specified, and the identified carrier group is transmitted using the first frame configuration.</u>Demodulate the one modulated signal<u style="single">Or by using the second frame configuration</u>The plurality of modulated signals<u style="single">Generate received data by demodulating</u>。 </p><p> Of the present invention<u style="single">Received signal demodulation</u>One aspect of the device is the base<u style="single">Is it a station?</u>Will be sent<u style="single">OFDM method</u>Receive signal<u style="single">Received signal demodulator to demodulate</u>And<u style="single">In the OFDM system signal, transmission data addressed to a plurality of terminals is assigned to a plurality of carrier groups, and one modulation signal is transmitted as a frame configuration of each of the plurality of carrier groups. A signal using a configuration or a second frame configuration in which a plurality of modulated signals are transmitted using a plurality of antennas, and each of the plurality of carrier groups includes a plurality of carriers and is a received signal. Based on the input unit to which is input and the control information included in the received signal input to the input unit, the carrier group to which the transmission data addressed to itself is assigned is specified, and the specified carrier group is described as described above. Received data is generated by demodating the one modulated signal transmitted using one frame configuration or by demodating the plurality of modulated signals transmitted using the second frame configuration. Modulation unit</u>And, the configuration is adopted.</p>
<p> According to the present invention, it can be configured by either a method of transmitting one modulated signal or a method of multiplexing and transmitting a plurality of modulated signals depending on the frequency and time. Further, by transmitting information of high importance by the method of transmitting one modulated signal, the communication partner can obtain the information accurately. In addition, depending on the communication status, the method of transmitting one modulated signal and the method of multiplexing and transmitting a plurality of modulated signals can be switched on the frequency axis or the time axis for communication to improve the transmission speed and transmission quality of information. It has the effect of being compatible.</p>
The gist of the present invention is achieved by improving the data transmission speed by multiplexing and transmitting a plurality of modulated signals in a transmitting device and separating and demodulating the transmitted multiple modulated signals in a receiving device. To. In addition, it is a method of transmitting one modulated signal of the communication method by configuring it by either a method of transmitting one modulated signal or a method of multiplexing and transmitting a plurality of modulated signals according to frequency and time. By transmitting highly important information, the communication partner can obtain the information accurately. In addition, depending on the communication status, the method of transmitting one modulated signal and the method of multiplexing and transmitting a plurality of modulated signals can be switched between frequency bands and time zones for communication to improve the transmission speed and transmission quality of information. It can be compatible.
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(Embodiment 1) In the present embodiment, in the multi-carrier communication system, a carrier that is not multiplexed in a transmission frame, a transmission device that transmits the multiplexed carriers, and a reception device that can demodulate the modulated signal of either carrier will be described.
FIG. 1 is a diagram showing an example of a frame configuration on the frequency-time axis of each channel in the first embodiment of the present invention. In FIG. 1, the vertical axis represents frequency and the horizontal axis represents time. Further, 101 is a guard symbol, 102 is an information symbol, 103 is an estimation symbol, and 104 is a control symbol.
In FIG. 1, the guard symbol 101 is a symbol in which no modulated signal exists. Further, the estimation symbol 103 is, for example, a pilot symbol for estimating time synchronization, frequency synchronization, and distortion due to a transmission line, or a unique word or preamble, and a known symbol, for example, a BPSK-modulated signal is suitable. .. The control symbol 104 is a symbol for transmitting information for the terminal to use for control, and is a symbol for transmitting information by the information symbol 102.
The communication method of the present embodiment is characterized in that one carrier 1 transmits only symbols of one channel, and another carrier multiplexes and transmits information symbols of a plurality of channels.
That is, in FIG. 1, only the information symbol of channel A is transmitted from carrier 1 to carrier 6, and the information symbol of channel A and the information symbol of channel B are multiplexed and transmitted from carrier 7 to carrier 12.
Similarly, only the estimation symbol of channel A is transmitted from carrier 1 to carrier 6, and the estimation symbol of channel A and the estimation symbol of channel B are multiplexed and transmitted from carrier 7 to carrier 12.
Hereinafter, a transmission device that transmits a signal in the frame configuration shown in FIG. 1 will be described. FIG. 2 is a block diagram showing a configuration of a transmission device according to the present embodiment.
The frame configuration signal generation unit 221 generates frame configuration information based on the input control signal 223, and outputs the frame configuration signal 222 composed of the frame configuration information to the serial parallel conversion unit 202 and the serial parallel conversion unit 212.
Hereinafter, a portion of the serial-parallel transform unit 202, the inverse discrete Fourier transform unit 204, the radio unit 206, the power amplification unit 208, and the antenna 210 for processing and transmitting the signal of channel A in FIG. 1 will be described. In channel A, as shown in FIG. 1, information symbols, estimation symbols, and control symbols are arranged on carriers 1 to 12 to transmit signals.
The serial-parallel conversion unit 202 converts the transmission digital signal 201 of channel A into parallel data arranged according to the frame configuration signal 222, and outputs the converted parallel signal 203 to the inverse discrete Fourier transform unit 204. Specifically, as shown in FIG. 1, the serial-parallel conversion unit 202 arranges information symbols, estimation symbols, and control symbols on carriers 1 to 12.
The inverse discrete Fourier transform unit 204 performs an inverse discrete Fourier transform on the parallel signal 203 of the channel A, and outputs the converted signal 205 to the radio unit 206. The radio unit 206 converts the signal 205 into a radio frequency to obtain the transmission signal 207, and outputs the transmission signal 207 to the power amplification unit 208.
The power amplification unit 208 amplifies the power of the transmission signal 207, and the power-amplified transmission signal 209 is transmitted from the antenna 210 as a radio wave.
Next, a part in which the serial-parallel transform unit 212, the inverse discrete Fourier transform unit 214, the radio unit 216, the power amplification unit 218, and the antenna 220 process and transmit the signal of channel B in FIG. 1 will be described. In channel B, as shown in FIG. 1, guard symbols are arranged on carriers 1 to 6, and information symbols, estimation symbols, and control symbols are arranged on carriers 7 to 12 to transmit signals.
The serial-parallel conversion unit 212 converts the transmission digital signal 211 of the channel B into parallel data arranged according to the frame configuration signal 222, and outputs the converted parallel signal 213 to the inverse discrete Fourier transform unit 214.
The inverse discrete Fourier transform unit 214 performs the parallel signal 213 inverse discrete Fourier transform, and outputs the converted signal 215 to the radio unit 216.
The radio unit 216 converts the converted signal 215 into a radio frequency to obtain a transmission signal 217, and outputs the transmission signal 217 to the power amplification unit 218.
The power amplification unit 218 amplifies the power of the transmission signal 217, and the power-amplified transmission signal 219 is transmitted from the antenna 220 as a radio wave.
In this way, in one channel, the carrier on which the guard symbol is placed and the carrier on which the information symbol is placed are separated, and in another channel, the information symbol is placed on all the carriers and the same carrier is shared (multiplexed) by a plurality of channels. ).
Hereinafter, the operation of the transmitter of FIG. 2 to transmit a signal in the frame configuration of FIG. 1 will be described.
The serial-parallel conversion unit 202 receives the transmission digital signal 201 and the frame configuration signal 222 as inputs, and arranges symbols according to the frame configuration of channel A in FIG. 1, that is, information symbols and control symbols from carriers 1 to 12. The estimation symbols are arranged to form a frame, and the parallel signal 203 of channel A is generated.
The serial-parallel converter 212 of channel B receives the transmission digital signal 211 and frame configuration signal 222 of channel B as inputs, and arranges symbols according to the frame configuration of channel B in FIG. 1, that is, information symbols from carriers 7 to 12 , Control symbols, and estimation symbols are arranged to form a frame, and the parallel signal 213 of channel B is generated.
The estimation symbol 103 is inserted for time synchronization and frequency offset estimation. Further, the estimation symbol of the carrier 1 to the carrier 6 of the channel A is used in the receiving device to estimate the transmission line distortion and demodulate the information symbol of the carrier 1 to the carrier 6 of the channel A. At this time, the estimation symbol is not inserted into carriers 1 to 6 on channel B.
Then, the estimation symbol of the carrier 7 to the carrier 12 of the channel A and the channel B is a symbol for separating the information symbol of the carrier 12 from the carrier 7 of the channel A and the channel B. For example, by using orthogonal symbols for estimation consisting of carriers 7 to 12 of channel A and carriers 7 to 12 of channel B, carriers 7 to 12 of channel A and channel B can be used. It becomes easy to separate the information symbols.
Here, comparing the information symbols of carriers 1 to 6 of channel A with the information symbols of carriers 7 to 12 of channel A and channel B, in the receiving device, the information symbols of carriers 1 to 6 of channel A are channels. Better quality than the carrier 7 to carrier 12 information symbols on A and channel B. Considering this, it is suitable for transmitting highly important information in the information symbols of carriers 1 to 6 of channel A. Here, the importance indicates data for which reception quality is desired, for example, information on a modulation method and an error correction method, and information on procedures for a transmitter / receiver.
Further, for example, video information is transmitted by using the information symbol of channel A of carrier 1 to carrier 6, and high-definition video is transmitted by using the information symbols of channel A and channel B of carrier 12 from carrier 7. As described above, one type of information medium can be transmitted on channel A from carrier 1 to carrier 6, and one type of information medium can be transmitted on channel A and channel B on carrier 7 to carrier 12. Further, in the transmission on the channel A from the carrier 1 to the carrier 6, and the transmission on the channel A and the channel B from the carrier 7 to the carrier 12, the same kind of information medium may be transmitted. At this time, the same type of information has different compression rates at the time of coding, for example. Here, the compression rate of channel A is lower than the compression rate of channel B.
In addition, some information is transmitted from the carrier 1 to the information symbol of the channel A of the carrier 6, and the difference information is transmitted using the information symbols of the channel A and the channel B of the carrier 7 to the carrier 12 and so on. Information can also be transmitted to.
Hereinafter, a receiving device for receiving the signal transmitted in the symbol arrangement described above will be described.
FIG. 3 is a block diagram showing the configuration of the receiving device of the present embodiment. FIG. 3 shows an example of the configuration of the receiving device according to the present embodiment. In FIG. 3, the radio unit 303 converts the received signal 302 received by the antenna 301 into a baseband frequency, and outputs the converted received orthogonal baseband signal 304 to the Fourier transform unit 305 and the synchronization unit 334.
The Fourier transform unit 305 Fourier transforms the received orthogonal baseband signal 304 and converts the converted parallel signal 306 into the transmission line distortion estimation unit 307, the transmission line distortion estimation unit 309, the signal processing unit 321, the selection unit 328, and the frequency offset. Output to the estimation unit 332.
The transmission line distortion estimation unit 307 estimates the transmission line distortion of channel A from the estimation symbol of the parallel signal 306, and outputs the transmission line distortion parallel signal 308 of channel A to the signal processing unit 321.
The transmission line distortion estimation unit 309 estimates the transmission line distortion of channel B from the estimation symbol of the parallel signal 306, and outputs the transmission line distortion parallel signal 310 of channel B to the signal processing unit 321.
The radio unit 313 converts the received signal 312 received by the antenna 311 into a baseband frequency, and outputs the converted received orthogonal baseband signal 314 to the Fourier transform unit 315 and the synchronization unit 334.
The Fourier transform unit 315 Fourier transforms the received orthogonal baseband signal 314 and transfers the converted parallel signal 316 to the transmission line distortion estimation unit 317, the transmission line distortion estimation unit 319, the signal processing unit 321, the selection unit 328, and the frequency offset. Output to the estimation unit 332.
The transmission line distortion estimation unit 317 estimates the transmission line distortion of channel A from the estimation symbol of the parallel signal 316, and outputs the transmission line distortion parallel signal 318 of channel A to the signal processing unit 321.
The channel distortion estimation unit 319 estimates the channel distortion of channel B from the estimation symbol of the parallel signal 316, and outputs the channel distortion parallel signal 320 to the signal processing unit 321.
The signal processing unit 321 separates the parallel signals 306 and 316 into the signals of channel A and channel B based on the transmission line distortion parallel signals 308 and 318 of channel A and the transmission line distortion parallel signals 310 and 320 of channel B. That is, the signal processing unit 321 separates the signals of the carrier 12 and the channel B from the carrier 7 in which the channel A and the channel B are multiplexed in FIG. 1, and the parallel signal 322 of the carrier 7 to the channel A of the carrier 12 Is output to the demodulation unit 324, and the parallel signal 323 of the channel B of the carrier 12 from the carrier 7 is output to the demodulation unit 326.
The demodulation unit 324 demodulates the parallel signal 322 of channel A of the carrier 12 from the carrier 7 and outputs the received digital signal 325 after the demodulation.
The demodulation unit 326 demodulates the parallel signal 323 of channel B of the carrier 12 from the carrier 7 and outputs the demodulated received digital signal 327.
The selection unit 328 takes the parallel signals 306 and 316 as inputs, selects, for example, the parallel signal having the larger electric field strength, and outputs the selected parallel signal as the parallel signal 329 to the demodulation unit 330.
The demodulator 330 estimates the transmission line distortion from the estimation symbol 103 of the carrier 6 from the non-multiplexed carrier 1 in FIG. 1 for the selected parallel signal 329, and the carrier 1 to the carrier 6 from the estimated transmission line distortion. The parallel signal of is demodulated, and the received digital signal 331 after demodulation is output.
The frequency offset estimation unit 332 estimates the frequency offset amount of the parallel signals 306 and 316 from the estimation symbol of FIG. 1, and outputs the frequency offset estimation signal 333 to the radio unit 303 and the radio unit 313. For example, the frequency offset estimation unit 332 inputs the frequency offset estimation signal to the radio units 303 and 313, and the radio units 303 and 313 remove the frequency offset of the received signal.
The synchronization unit 334 synchronizes the reception orthogonal baseband signals 304 and 314 with the estimation symbols in FIG. 1 in time, and outputs the timing signal 335 to the Fourier transform unit 305 and the Fourier transform unit 315. That is, the synchronization unit 334 can synchronize the time with the transmission device by detecting the reception orthogonal baseband signal 304 and the estimation symbol 103 of FIG. 1 in the reception orthogonal baseband signal.
Further, the frequency offset estimation unit 332 estimates the frequency offset from the estimation symbol 103 of FIG. 1 in the parallel signals 306 and 316.
The signal processing unit 321 separates the multiplexed signals of channel A and channel B for the carriers 7 to 12 in FIG. 1, and outputs them as the parallel signal 322 of channel A and the parallel signal 323 of channel B, respectively.
The demodulation unit 324 demodulates the parallel signal 322 of channel A of the carrier 12 from the carrier 7. Further, the demodulation unit 326 demodulates the parallel signal 323 of the carrier 12 channel B from the carrier 7.
The demodulator 330 estimates the transmission line distortion of the selected parallel signal 329 from the non-multiplexed carrier 1 to the estimation symbol 103 of the carrier 6 in FIG. 1, and from the estimated transmission line distortion, the carrier 1 to the carrier 6 Demodulate the parallel signal of.
At this time, the received digital signals 325 and 327 obtained from the carrier 7 to the carrier 12 channel A and the channel B are transmitted at a higher speed, although the quality is poorer than that of the received digital signal 331 of the carrier 1 to the carrier 6 channel A. it can. Therefore, it is suitable for the transmission of important information and the transmission of control information in the received digital signal 331 of channel A of carriers 1 to 6.
Further, the received digital signals 325 and 327 obtained from the channels A and B of the carriers 7 to 12 are input to the decoder X (not shown) and decoded. Then, the received digital signal 331 of the channel A of the carrier 1 to the carrier 6 is input to the decoder Y (not shown) and decoded. As a result, different information X and Y can be obtained from different decoders X and Y, and information having the same information but different compression rates can be transmitted in the decoders X and Y.
Then, the video is transmitted by the received digital signal 331 of the channel A of the carrier 1 to the carrier 6, and the difference information for the high-definition video is transmitted by the received digital signals 325 and 327 obtained from the channel A and the channel B of the carrier 7 to the carrier 12. Hierarchical transmission to be transmitted can be performed.
As described above, according to the transmitting device and the receiving device of the present embodiment, a frame for transmitting a plurality of modulated signals from a plurality of antennas and a frame for transmitting a modulated signal from one antenna are created, and important information is input to one. By transmitting the modulated signal transmitted from the antenna, the quality of data can be ensured in the receiving device.
Further, according to the transmitting device and the receiving device of the present embodiment, different information is transmitted in a frame for transmitting a plurality of modulated signals from a plurality of antennas and a frame for transmitting a modulated signal from one antenna to obtain quality. Information with different transmission speeds can be transmitted.
In addition, although the multiple frame of 2 antennas and 2 channels and the non-multiplexed frame are described as examples in FIGS. 1, 2 and 3, the present invention is not limited to this. For example, the same can be performed for a multiple frame having three antennas and three channels, a multiple frame with two antennas and two channels, and a frame having non-multiplexed frames. ..
Moreover, the frame configuration is not limited to FIG. Then, as the communication method, the OFDM method has been described as an example, but if it is a multi-carrier method, it can be implemented in the same manner. Further, the spectral diffusion communication method may be used in the method of each carrier of the multi-carrier. Therefore, it is possible to carry out in the same manner in OFDM-CDM (OFDM-CDM: Orthogonal Frequency Division Multiplex --Code Division Multiplex).
In addition, one antenna may form one antenna with a plurality of antennas.
(Embodiment 2) In the second embodiment of the present invention, when the base station uses a multi-carrier communication method for communicating with a plurality of terminals, carriers that are not multiplexed and carriers that are multiplexed are prepared in the transmission frame of the base station, and each terminal is provided with a carrier. On the other hand, a communication method for transmitting a modulated signal by either carrier, a transmitting device, and a receiving device will be described.
In the present embodiment, the frame configuration shown in FIG. 1 is used, and a signal is transmitted by the base station apparatus shown in FIG. FIG. 4 is a diagram showing an example of the arrangement state of the base station and the terminal in the second embodiment of the present invention. In FIG. 4, 401 indicates a base station, 402 indicates a terminal A, 403 indicates a terminal B, 404 indicates a terminal C, 405 indicates a terminal D, and 406 indicates a communication limit of a transmission signal of the base station 401.
When the positions of the base station and the terminal are as shown in FIG. 4, the terminals A402 and B403, which are far from the base station 401, have poor reception conditions, while the terminals C404 and D405 have poor reception conditions. Since the distance from the base station 401 is short, the reception condition is good.
In consideration of this, the base station provided with the transmission device of the present embodiment is assigned to the communication terminal in units of three carriers, for example, as shown in FIG.
In this case, in FIG. 4, carriers 7 to 9 in FIG. 1 are assigned for communication with the terminal C404 having a good reception state, and carriers 10 to 12 in FIG. 1 are assigned for communication with the terminal D405, and channel A and channel B are assigned. The transmission speed is high because the communication is performed by. Then, carriers 1 to 3 in FIG. 1 are assigned for communication with the terminal A402 having a poor reception state, and carriers 6 to 6 in FIG. 1 are assigned for communication with the terminal B403, and communication is performed on channel A. The transmission speed is low, but the transmission quality is good.
At this time, the control symbol 104 in FIG. 1 transmits information about channel allocation, and the terminal demodulates the control symbol 104 to know where in the frame the information for itself is allocated. be able to.
Next, the receiving device side will be described. FIG. 5 is a block diagram showing an example of the configuration of the receiving device of the present embodiment. However, for those having the same configuration as in FIG. 3, the same numbers as in FIG. 3 are assigned, and detailed description thereof will be omitted.
The radio wave propagation environment estimation unit 501 determines the electric field strength, multipath environment, Doppler frequency, arrival direction, channel variation, interference wave strength, polarization state, and the electric field strength of the received signals received by the antenna 301 and the antenna 311 from the parallel signals 306 and 316. The delay profile is estimated and output as radio wave propagation environment information 502.
FIG. 6 is a block diagram showing an example of the configuration of the transmission device of the present embodiment. The information generation unit 604 generates and transmits a transmission digital signal 605 from the data 601 and the radio wave propagation environment information 602 in accordance with the required information 603 such as transmission speed, modulation method, and transmission quality required by the user or the communication terminal. The digital signal 605 is output to the modulation signal generation unit 606.
The modulation signal generation unit 606 modulates the transmission digital signal 605 and outputs the transmission orthogonal baseband signal 607 to the radio unit 608.
The radio unit 608 converts the transmission orthogonal baseband signal 607 into a radio frequency to generate a modulated signal 609, and the modulated signal 609 is output as a radio wave from the antenna 610.
Next, the operation of the transmitter of FIG. 6 will be described. The radio wave propagation environment information 502 estimated by the radio wave propagation environment estimation unit 501 of the receiving device of FIG. 5 corresponds to the radio wave propagation environment information 602 and is input to the information generation unit 604.
The information generation unit 604 transmits digital from data 601 and radio wave propagation environment information 602, information required by users and communication terminals, for example, information generation unit 604 from request information 603 such as transmission speed, modulation method, and transmission quality. Generate signal 605. As a result, the terminal transmits a signal including the radio wave propagation environment when the terminal receives the modulated signal transmitted by the base station and the request information requested by the user or the terminal.
Further, as an operation different from this, the information generation unit 604 starts from the data 601, the radio wave propagation environment information 602, and the information required by the user or the communication terminal, for example, the required information 603 such as the transmission speed, the modulation method, and the transmission quality. , The communication method is determined and requested, and the transmission digital signal 605 is output. At this time, the transmission digital signal 605 includes information on the required communication method. At this time, the communication method is information on whether to communicate with multiple signals or with non-multiplexed signals.
FIG. 7 is a block diagram showing an example of the configuration of the receiving device of the present embodiment. In FIG. 7, the radio unit 703 converts the received signal 702 received by the antenna 701 into a baseband frequency, and outputs the received orthogonal baseband signal 704 to the demodulation unit 705.
The demodulation unit 705 demodulates the reception orthogonal baseband signal 704 and outputs the reception digital signal 706 to the method determination unit 707.
The method determination unit 707 extracts radio wave propagation environment information and request information included in the received digital signal 706 and transmits the transmission method to the terminal by the base station, that is, a method of transmitting signals of a plurality of channels from a plurality of antennas. Select one of the methods of transmitting the signal of one channel without multiplexing the signals of a plurality of channels, and output it as the control signal 708.
Next, the operation of the receiving device shown in FIG. 7 will be described. In FIG. 7, the method determination unit 707 extracts radio wave propagation environment information and request information included in the signal transmitted by the transmission device of terminal A, or extracts the requested communication method information, and multiple channels from a plurality of antennas. The method of transmitting the signal of 1 channel or the method of transmitting the signal of 1 channel without multiplexing the signals of a plurality of channels is selected and output as the control signal 708.
The frame configuration signal generation unit 221 in the base station transmitter of FIG. 2 inputs the control signal 708 from the receivers for terminals A, B, C, and D as the control signal 223, and outputs the frame configuration signal 222. To do. As a result, the transmitting device of the base station can transmit the modulated signal according to the frame configuration of FIG.
Next, a means for setting a communication method at the start of communication when communicating with the transmitting device and the receiving device will be described.
When considering the reception characteristics for the radio wave propagation environment, the information symbol of channel A from carrier 1 to carrier 6 has better quality than the information symbol of channel A and the information symbol of channel B from carrier 7 to carrier 12.
Therefore, when the terminal and the base station start communication, the base station stabilizes the system by transmitting information to the terminal using the information symbols of channel A from carriers 1 to 6 to maintain the quality of the data. ..
Alternatively, when the terminal and the base station start communication, the base station first transmits the estimation symbol 103 to the terminal as shown in FIG. 1, and the terminal receives the first transmitted estimation symbol 103 and receives radio waves. The propagation environment is estimated, and the terminal transmits the radio wave propagation environment estimation information and the request information.
Then, the base station transmits information with the information symbol of channel A from carrier 1 to carrier 6 based on the radio wave propagation environment information and request information from the terminal, or the information symbol of channel A from carrier 7 to carrier 12. And select whether to transmit information with the information symbol of channel B, and start communication. As a result, the quality of the data can be maintained and the system is stable.
Alternatively, when the terminal and the base station start communication, the base station first transmits the estimation symbol 103 to the terminal as shown in FIG. 1, and the terminal receives the first transmitted estimation symbol 103 and receives radio waves. Estimate the propagation environment, consider the radio wave propagation environment estimation information and the required information, and transmit the information with the information symbol of channel A from carrier 1 to carrier 6, or the information symbol of channel A from carrier 7 to carrier 12. And select whether to transmit information with the information symbol of channel B, and request the base station.
The base station transmits information from the request from the terminal using the information symbol of channel A from carrier 1 to carrier 6, or the information symbol of channel A and channel B from carrier 7 to carrier 12. Select whether to transmit and start communication. As a result, the quality of the data can be maintained and the system is stable.
As described above, according to the transmitting device and the receiving device of the present embodiment, when the base station communicates with a plurality of terminals, the communication with the terminal having a poor reception state is multiplexed in the transmission frame of the base station. By allocating no carriers and allocating multiple carriers for communication with a terminal having a good reception state, the terminal can achieve both data transmission speed and transmission quality.
In the above description, in FIGS. 1, 2, and 3, a multiple frame having two antennas and two channels and a non-multiplexed frame have been described as examples, but the present invention is not limited to this. For example, the same can be performed for a multiple frame having three antennas and three channels, a multiple frame with two antennas and two channels, and a frame having non-multiplexed frames. ..
Moreover, the frame configuration is not limited to FIG. Then, as the communication method, the OFDM method has been described as an example, but if it is a multi-carrier method, it can be implemented in the same manner. Further, the spectral diffusion communication method may be used in the method of each carrier of the multi-carrier. Therefore, it is possible to carry out the same in OFDM-CDM.
In addition, one antenna may form one antenna with a plurality of antennas.
(Embodiment 3) In the third embodiment of the present invention, the receiving device capable of demodulating the modulated signal frequency, the non-multiplexed modulated signal frequency, and the modulated signal of either frequency in the transmission frame of the transmitting device will be described.
FIG. 8 is a diagram showing a frame configuration of a communication signal according to the third embodiment of the present invention. FIG. 8 shows an example of a frame configuration on the frequency-time axis of channel A and channel B of the base station transmission signal in the frequency band f1 in the present embodiment. In FIG. 8, the vertical axis represents frequency and the horizontal axis represents time. Further, 102 is an information symbol, 103 is an estimation symbol, and 104 is a control symbol. At this time, the estimation symbol 103 is a pilot symbol for estimating time synchronization, frequency synchronization, and distortion due to the transmission line, and the control symbol 104 is a symbol for transmitting information for use by the terminal for control. It is a symbol for transmitting information by the information symbol 102.
At this time, the signals of channel A and channel B are transmitted from the two antennas, respectively. The transmitting device of the present embodiment transmits a signal of channel C different from the signal of channel A and channel B by an antenna different from the antenna for channel A and channel B. Hereinafter, the frame configuration of the channel C signal will be described.
FIG. 9 is a diagram showing a frame configuration of a communication signal according to the third embodiment of the present invention. FIG. 9 shows an example of the frame configuration on the frequency-time axis of the channel C of the base station transmission signal in the frequency band f2 in the present embodiment. In FIG. 9, the vertical axis indicates the frequency and the horizontal axis indicates the time. .. Further, 102 is an information symbol, 103 is an estimation symbol, and 104 is a control symbol. At this time, the estimation symbol 103 is a pilot symbol for estimating time synchronization, frequency synchronization, and distortion due to the transmission line, and the control symbol 104 is a symbol for transmitting information for use by the terminal for control. It is a symbol for transmitting information by the information symbol 102.
At this time, the signal of channel C is transmitted from one antenna different from the antennas for channel A and channel B.
Further, the signal of channel C is transmitted at a frequency different from that of channel A and channel B. FIG. 10 is a diagram showing a frequency arrangement of the base station transmission signal in the present embodiment. In FIG. 10, the vertical axis represents power and the horizontal axis represents frequency. Further, 1001 indicates multiple transmission signals of channel A and channel B, and the frequency band is f1. 1002 indicates the transmission signal of channel C, and the frequency band is f2. In this way, the signal of channel C is transmitted at a frequency different from that of channel A and channel B.
In FIG. 10, carriers are arranged at frequencies f1 and f2, and the frequency f1 is assigned for transmission of the base station, and the frame configuration at that time is as shown in FIG.
The frequency f2 is assigned for base station transmission, and the frame configuration at that time is as shown in FIG. At the frequency f1, for example, channel A and channel B are multiplexed and transmitted, and the transmission speed is high, but the transmission quality is poor. On the other hand, at frequency f2, channel C is transmitted and is not multiplexed, so the transmission speed is low, but the transmission quality is good.
Next, a transmission device for transmitting signals of channel A, channel B, and channel C described above will be described.
FIG. 11 is a block diagram showing an example of the configuration of the transmission device of the base station according to the present embodiment. However, for those having the same configuration as that shown in FIG. 2, the same numbers as those shown in FIG. 2 are assigned, and detailed description thereof will be omitted.
In FIG. 11, the serial-parallel conversion unit 1102 generates and outputs a parallel signal 1103 from the transmission digital signal 1101 of the channel C according to the frame configuration signal 222.
The inverse discrete Fourier transform unit 1104 performs inverse Fourier transform on the parallel signal 1103 of channel C, and outputs the signal 1105 after the inverse discrete Fourier transform to the radio unit 1106.
The radio unit 1106 converts the signal 1105 after the inverse discrete Fourier transform of channel C into a radio frequency, and outputs the transmission signal 1107 of channel C to the power amplification unit 1108.
The power amplification unit 1108 amplifies the transmission signal 1107 of the channel C, and the amplified transmission signal 1109 of the channel C is output as a radio wave from the antenna 1110 of the channel C.
Next, the operation of the transmitter of FIG. 11 will be described.
The serial-parallel conversion unit 202 of channel A has information symbols, control symbols, and estimation symbols according to the frame configuration of channel A in FIG. 8 based on the transmission digital signal 201 and frame configuration signal 222 of channel A. Generates a parallel signal 203 for channel A.
The serial-parallel converter 212 of channel B has information symbols, control symbols, and estimation symbols according to the frame configuration of channel B in FIG. 8 based on the transmission digital signal 211 and frame configuration signal 222 of channel B. Generates channel B parallel signal 213.
Then, the signals of channel A and channel B are transmitted at the frequency f1.
The estimation symbol 103 in FIG. 8 is inserted for time synchronization and frequency offset estimation. It is also a symbol for performing channel estimation for separating the signals of channel A and channel B.
The serial-parallel converter 1102 of channel C has an information symbol, a control symbol, and an estimation symbol according to the frame configuration of channel C in FIG. 9 based on the transmission digital signal 1101 of channel C and the frame configuration signal 222. Generates a parallel signal 1103 for channel C.
Then, the signal of channel C is transmitted at the frequency f2.
The estimation symbol 103 in FIG. 9 is inserted for time synchronization and frequency offset estimation.
Comparing the information symbols of channel A with the information symbols of channel A and channel B When comparing the information symbols of channel C, the quality is better than the information symbols of channel C in the receiving device. Considering this, it is suitable for transmitting highly important information in the information symbol of channel C.
A kind of information medium is transmitted on channel C, for example, video information is transmitted using the information symbol of channel C, and high-definition video is transmitted using the information symbols of channel A and channel B. A kind of information medium can be transmitted on A and channel B. Further, in the transmission on channel C and the transmission on channel A and channel B, the same type of information medium may be transmitted. At this time, the same type of information has different compression rates at the time of coding, for example.
Information can also be transmitted hierarchically, such as transmitting some information that is the information symbol of channel C and transmitting difference information using the information symbols of channel A and channel B.
FIG. 12 is a block diagram showing a configuration of a terminal receiving device according to the present embodiment. In FIG. 12, the radio unit 1203 converts the received signal 1202 in the frequency band f1 received by the antenna 1201 into a baseband frequency, and outputs the received orthogonal baseband signal 1204 to the Fourier transform unit 1205 and the synchronization unit 1230.
The Fourier transform unit 1205 Fourier transforms the received orthogonal baseband signal 1204 and outputs the parallel signal 1206 to the transmission line distortion estimation unit 1207, the transmission line distortion estimation unit 1209, the signal processing unit 1221, and the frequency offset estimation unit 1228.
The transmission line distortion estimation unit 1207 estimates the transmission line distortion of channel A from the estimation symbol of the parallel signal 1206, and outputs the transmission line distortion parallel signal 1208 of channel A to the signal processing unit 1221.
The channel distortion estimation unit 1209 estimates the channel distortion of channel B from the estimation symbol of the parallel signal 1206, and outputs the channel distortion parallel signal 1210 to the signal processing unit 1221.
The radio unit 1213 converts the received signal 1212 in the frequency band f1 received by the antenna 1211 into a baseband frequency, and outputs the received orthogonal baseband signal 1214 to the Fourier transform unit 1215 and the synchronization unit 1230.
The Fourier transform unit 1215 Fourier transforms the received orthogonal baseband signal 1214 and transfers the converted parallel signal 1216 to the transmission line distortion estimation unit 1217, the transmission line distortion estimation unit 1219, the signal processing unit 1221, and the frequency offset estimation unit 1228. Output.
The transmission line distortion estimation unit 1217 estimates the transmission line distortion of channel A from the estimation symbol of the parallel signal 1216, and outputs the transmission line distortion parallel signal 1218 of channel A to the signal processing unit 1221.
The channel distortion estimation unit 1219 estimates the channel distortion of channel B from the estimation symbol of the parallel signal 1216, and outputs the channel distortion parallel signal 1220 to the signal processing unit 1221.
The signal processing unit 1221 separates the parallel signals 1206 and 1216 into the channels A and B based on the channel A transmission line distortion parallel signals 1208 and 1218 and the channel B transmission line distortion parallel signals 1210 and 1220. Then, the signal processing unit 1221 outputs the parallel signal 1222 of the channel A to the demodulation unit 1224 and the parallel signal 1223 of the channel B to the demodulation unit 1226 among the separated signals.
The demodulation unit 1224 demodulates the parallel signal 1222 of channel A and outputs the received digital signal 1225.
The demodulation unit 1226 demodulates the parallel signal 1223 of channel B and outputs the received digital signal 1227.
The frequency offset estimation unit 1228 estimates the frequency offset amount from the parallel signals 1206 and 1216, and outputs the frequency offset estimation signal 1229. Ingredients in the body, the frequency offset estimation unit 1228 estimates a frequency offset amount from the estimation symbols 103 in FIG. 8. Then, the frequency offset estimation unit 1228 outputs the frequency offset estimation signal to, for example, the radio units 1203 and 1213, and the radio units 1203 and 1213 remove the frequency offset of the received signal.
The synchronization unit 1230 synchronizes the time with the reception orthogonal baseband signals 1204 and 1214, and outputs the timing signal 1231 to the Fourier transform unit 1205 and the Fourier transform unit 1215. For example, the synchronization unit 1230 synchronizes time with the estimation symbol 103 in FIG.
The radio unit 1234 converts the received signal 1233 in the frequency band f2 received by the antenna 1232 into a baseband frequency, and outputs the received orthogonal baseband signal 1235 to the Fourier transform unit 1236 and the synchronization unit 1244.
The Fourier transform unit 1236 Fourier transforms the received orthogonal baseband signal 1235 and outputs the parallel signal 1237 to the transmission line distortion estimation unit 1238, the demodulation unit 1240, and the frequency offset estimation unit 1242.
The transmission line distortion estimation unit 1238 estimates the transmission line distortion from the parallel signal 1237, and outputs the transmission line distortion parallel signal 1239 to the demodulation unit 1240.
The demodulation unit 1240 removes the transmission line distortion from the parallel signal 1237 of the channel C based on the transmission line distortion parallel signal 1239, demodulates the signal, and outputs the received digital signal 1241 of the channel C.
Next, the operation of the receiving device of FIG. 12 will be described.
The synchronization unit 1230 detects the estimation symbol 103 of FIG. 8 in the reception orthogonal baseband signal 1204 and the reception orthogonal baseband signal 1214, and the receiving device synchronizes with the transmitting device in time.
Further, the frequency offset estimation unit 1228 estimates the frequency offset from the estimation symbol 103 of FIG. 8 in the parallel signals 1206 and 1216.
The signal processing unit 1221 separates the multiplexed signal of FIG. 8 into a channel A signal and a channel B signal.
The synchronization unit 1244 synchronizes the reception orthogonal baseband signal 1235 with time from the estimation symbol of FIG.
The frequency offset estimation unit 1242 estimates the frequency offset of the parallel signal 1237 from the estimation symbol of FIG.
The transmission line distortion estimation unit 1238 estimates the transmission line distortion from the estimation symbol of FIG. 9 for the parallel signal 1237.
The demodulation unit 1240 of channel C takes the transmission line distortion parallel signal 1239 as an input and demodulates the information symbol of the parallel signal 1237.
At this time, the received digital signals 1225 and 1227 obtained from the channels A and B are inferior in quality to the received digital signals 1241 of the channel C, but can be transmitted at high speed. Considering this, the received digital signal 1241 on channel C is suitable for transmission of important information and control information.
Further, the received digital signals 1225 and 1227 obtained from channels A and B are input to a decoder X (not shown) and decoded. Then, the received digital signal 1241 of the channel C is input to the decoder Y (not shown) and decoded. As a result, different information X and Y can be obtained from different decoders X and Y, and information having the same information but different compression rates can be transmitted in the decoders X and Y.
Then, the video is transmitted by the received digital signal 1241 of the channel C, and the difference information for the high-definition video can be transmitted in layers by the received digital signals 1225 and 1227 obtained from the channels A and B.
As described above, according to the transmitting device and the receiving device of the present embodiment, there are a frequency for transmitting a plurality of modulated signals from a plurality of antennas and a frequency for transmitting a modulated signal from one antenna, which is important. Data quality can be ensured in the receiving device by transmitting various information as a modulated signal transmitted from one antenna.
Further, according to the transmitting device and the receiving device of the present embodiment, different information is transmitted depending on the frequency for transmitting a plurality of modulated signals from a plurality of antennas and the frequency for transmitting a modulated signal from one antenna. Therefore, it is possible to transmit information having different qualities and transmission speeds.
Although the explanation has been given in FIG. 8 with a multiple frame having two channels, the present invention is not limited to this. Further, in FIG. 10, two frequency bands have been described, but this is not the case. That is, for example, there are three frequency bands, and frequencies may be assigned for 3-channel multiplex transmission, 2-channel multiplex transmission, and 1-channel multiplex transmission.
From the above, the configuration of two antennas transmitting the number of channels 2 and one antenna transmitting the number of channels 1 in the transmitting device of FIG. 11 has been described, but the present invention is not limited to this. For example, the transmitting device may include two or more antennas for transmitting two channels.
In addition, when there are three frequency bands and frequencies are assigned for 3-channel multiplex transmission, 2-channel multiplex transmission, and 1-channel transmission, the transmitter is equipped with multiple antennas for 3-channel multiplex transmission, and 2 A plurality of antennas may be provided for channel multiplex transmission, and a plurality of antennas may be provided for one channel transmission. The same applies to the receiving device shown in FIG.
Then, as the communication method, the OFDM method has been described as an example, but if it is a multi-carrier method, it can be implemented in the same manner. Further, the spectral diffusion communication method may be used in the method of each carrier of the multi-carrier. Therefore, it can be similarly implemented in OFDM-CDM (OFDM-CDM: Orthogonal Frequency Division Multiplex Code Division Multiplex).
In addition, one antenna may form one antenna with a plurality of antennas.
(Embodiment 4) In the fourth embodiment of the present invention, when the base station communicates with a plurality of terminals, the frequency of the multiplexed modulated signal and the frequency of the non-multiplexed modulated signal are prepared in the transmission frame of the base station, and each terminal is provided with the frequency of the modulated signal. On the other hand, a communication method for transmitting a modulated signal at either frequency, a transmitting device, and a receiving device will be described.
FIG. 13 is a diagram showing an example of the configuration of the receiving device of the terminal according to the fourth embodiment of the present invention. However, for those having the same configuration as that of FIG. 12, the same numbers as those of FIG. 12 are assigned, and detailed description thereof will be omitted. The receiving device of FIG. 13 includes a radio wave propagation environment estimation unit 1301 and a radio wave propagation environment estimation unit 1303, and the point of estimating the propagation environment in the receiving device using the frequency assigned information in the base station is the reception in FIG. Different from the device.
The radio wave propagation environment estimation unit 1301 estimates the radio wave propagation environment of each of the received signals received by the antenna 1201 and the antenna 1211 from the parallel signals 1206 and 1216, and outputs the radio wave propagation environment estimation information 1302.
The radio wave propagation environment estimation unit 1303 estimates the radio wave propagation environment of the received signal received by the antenna 1232 from the parallel signal 1237, and outputs it as radio wave propagation environment estimation information 1304.
FIG. 14 is a diagram showing an example of the configuration of the transmission device of the base station according to the present embodiment. However, for those having the same configuration as that in FIG. 5, the same numbers as those in FIG. 5 are assigned, and detailed description thereof will be omitted. The receiving device of FIG. 14 includes an information generating unit 604, and based on the propagation environment estimated by the receiving device, the base station allocates a frequency that is not multiplexed and receives the communication with the terminal having a poor reception state. It differs from the transmitter in FIG. 5 in that the base station allocates multiple frequencies for communication with a terminal in good condition.
The information generation unit 604 generates a transmission digital signal 605 from the data 601, radio wave propagation environment estimation information 1401 and 1402, and request information 603, and outputs the transmission digital signal 605 to the modulation signal generation unit 606.
The base station apparatus transmits information about channel allocation by the control symbol 104 in FIGS. 8 and 9, and the terminal demodulates the control symbol 104 to allocate information for itself anywhere in the frame. You can know if it is done.
Next, the operation of the receiving device and the transmitting device of the terminal will be described in detail.
In FIG. 13, the radio wave propagation environment estimation unit 1301 receives parallel signals 1206 and 1216 as inputs, and for example, from the estimation symbol 103 in FIG. 8, the electric field strength of the signal received by the antenna 1201 and the signal received by the antenna 1211. , Multipath environment, Doppler frequency, direction of arrival, channel variation, jamming intensity, polarization state, delay profile.
The radio wave propagation environment estimation unit 1303 describes the electric field strength, multipath environment, Doppler frequency, arrival direction, channel fluctuation, interfering wave strength, and polarization state of the signal received by the antenna 1232 from the estimation symbol of FIG. 9 for the parallel signal 1237. , Estimate the delay profile.
The transmitting device of FIG. 14 uses the radio wave propagation environment estimation information 1302 and the radio wave propagation environment estimation information 1304 estimated by the receiving device to determine whether to allocate a non-multiplexed frequency or a base station to allocate a multiplexed frequency. .. The radio wave propagation environment estimation information 1302 estimated by the radio wave propagation environment estimation unit 1301 of the receiving device in FIG. 13 is the radio wave propagation environment estimation information 1401, and the radio wave propagation environment estimation information 1304 estimated by the radio wave propagation environment estimation unit 1303 is the radio wave propagation environment estimation information. It corresponds to information 1402 and is input to the information generation unit 604.
The information generation unit 604 is described by the information generation unit 604 from the data 601, the radio wave propagation environment estimation information 1401 and 1402, and the required information 603 such as the transmission speed, the modulation method, and the transmission quality required by the user and the communication terminal. Generates a transmit digital signal 605. As a result, the terminal transmits a signal including the radio wave propagation environment when the terminal receives the modulated signal transmitted by the base station and the request information requested by the user or the terminal.
Further, the information generation unit 604 inputs data 601 and radio wave propagation environment information 602, and required information 603 such as transmission speed, modulation method, and transmission quality required by the user and the communication terminal, and receives radio wave propagation environment estimation information. The communication method is determined and requested from 1401, 1402 and request information 603. At this time, the transmission digital signal 605 includes information on the required communication method. At this time, the communication method is information on whether to communicate at the multiplex signal and the frequency f1 or the non-multiplexed signal and the frequency f2.
Using the information of this communication method, the base station apparatus determines whether to communicate at the multiplex signal or frequency f1 or to transmit the signal using the non-multiplexed signal or frequency f2.
For example, in the base station of FIG. 7, the method determination unit 707 extracts radio wave propagation environment information and request information included in the signal transmitted in FIG. 14, or extracts the requested communication method information. Then, the method determination unit 707 uses the communication method information to determine the method of frequency f1 for transmitting signals of a plurality of channels from a plurality of antennas, and the method of frequency f2 for transmitting signals of one channel without multiplexing the signals of a plurality of channels. Select one of the methods and output as a control signal 708.
The frame configuration signal generation unit 221 in the base station transmitting device of FIG. 11 controls the control signal 708 of FIG. 7 from the receiving device for each terminal (for example, terminal A, terminal B, terminal C, and terminal D of FIG. 4). A frame is configured as the signal 223, and the frame configuration signal 222 is output. As a result, the transmitting device of the base station can transmit the modulated signal according to the frame configurations of FIGS. 8 and 9.
Next, a means for setting the communication method at the start of communication will be described.
When considering the reception characteristics for the radio wave propagation environment, the information symbol of channel C has better quality than the information symbol of channel A and the information symbol of channel B.
Therefore, when the terminal and the base station start communication, the base station stabilizes the system by transmitting information to the terminal with the information symbol of channel C to maintain the quality of the data.
Alternatively, when the terminal and the base station start communication, the base station first transmits the estimation symbol 103 to the terminal as shown in the frame configurations of FIGS. 8 and 9. Then, the terminal receives the first transmitted estimation symbol 103, estimates the radio wave propagation environment, and the terminal transmits the radio wave propagation environment estimation information and the request information. Then, the base station decides whether to transmit the information by the information symbol of channel C or the information symbol of channel A and the information symbol of channel B based on the radio wave propagation environment information and the request information from the terminal. Select and start communication. As a result, the quality of the data can be maintained and the system is stable.
Alternatively, when the terminal and the base station start communication, the base station first transmits the estimation symbol 103 to the terminal as shown in FIGS. 8 and 9, and the terminal receives the first transmitted estimation symbol 103. Then, the radio wave propagation environment is estimated, and the information is transmitted by the information symbol of channel C or the information symbol of channel A and the information symbol of channel B in consideration of the radio wave propagation environment estimation information and the request information. Select or request the base station. From the request from the terminal, the base station selects whether to transmit information using the information symbol of channel C or the information symbol of channel A and the information symbol of channel B, and starts communication. As a result, the quality of the data can be maintained and the system is stable.
As described above, according to the transmitting device and the receiving device of the present embodiment, when the base station communicates with a plurality of terminals, the communication with the terminal having a poor reception state is multiplexed in the transmission frame of the base station. By allocating frequencies that are not available and assigning multiple frequencies to communication with terminals that are in good reception, the terminals can achieve both data transmission speed and transmission quality.
It should be noted that, although the description was made with a multiple frame having two channels in FIG. 8, the description is not limited to this, and the description is made with two frequency bands in FIG. 10, but the description is not limited to this. That is, for example, there are three frequency bands, and frequencies may be assigned for 3-channel multiplex transmission, 2-channel multiplex transmission, and 1-channel transmission. From the above, the configuration of two antennas that transmit the number of channels 2 and one antenna that transmits the number of channels 1 in the transmitter of FIG. 11 has been described, but the present invention is not limited to this, and in order to transmit the number of channels 2. It may be equipped with two or more antennas. In addition, there are three frequency bands, and when frequencies are assigned for 3-channel multiplex transmission, 2-channel multiplex transmission, and 1-channel multiplex transmission, multiple antennas are provided for 3-channel multiplex transmission, and for 2-channel multiplex transmission. May be provided with a plurality of antennas and a plurality of antennas for one-channel transmission. The same applies to the receiving device shown in FIG. Then, as the communication method, the OFDM method has been described as an example, but either the multi-carrier method or the single-carrier method can be similarly implemented. Further, the spectral diffusion communication method may be used in the method of each carrier of the multi-carrier. Therefore, it is possible to carry out in the same manner in OFDM-CDM (OFDM-CDM: Orthogonal Frequency Division Multiplex --Code Division Multiplex).
In addition, one antenna may form one antenna with a plurality of antennas.
(Embodiment 5) In Embodiment 5 of the present invention, a transmission device that transmits a modulated signal of a non-multiplexed time and a modulated signal of a multiplexed time to a transmission frame, and a receiving device capable of demodulating the modulated signal of either time will be described.
FIG. 15 is a diagram showing an example of a frame configuration on the frequency-time axis of channel A and channel B in the present embodiment. In FIG. 15, the vertical axis represents frequency and the horizontal axis represents time. Further, 101 is a guard symbol, 102 is an information symbol, 103 is an estimation symbol, and 104 is a control symbol. At this time, the guard symbol 101 is a symbol in which no modulated signal exists, the estimation symbol 103 is a pilot symbol for estimating distortion due to time synchronization, frequency synchronization, and transmission line, and the control symbol 104 is controlled by the terminal. It is a symbol for transmitting information for use, and the information symbol 102 is a symbol for transmitting information.
At this time, the information symbol of channel A and the information symbol of channel B are transmitted from time 3 to time 10, and only the information symbol of channel A is transmitted from time 11 to time 18.
The operation of this transmitter will be described below.
According to the frame configuration signal 222, the serial-parallel converter 202 frames the transmission digital signal 201 of channel A so that the information symbol, the control symbol, and the estimation symbol exist as in the frame configuration of channel A in FIG. Configure.
The serial-parallel conversion unit 212 transmits the transmission digital signal 211 of channel B according to the frame configuration signal 222 of the estimation symbol 103 at time time 1 and the information symbol 102 at time 3 to 10 according to the frame configuration of channel B in FIG. The parallel signal 213 of channel B is output.
The estimation symbol 103 is inserted for time synchronization and frequency offset estimation. It is also used for signal separation of frames in which the symbols of channel A and channel B are multiplexed.
Comparing the information symbols of channel A of time 11 to 18 with the information symbols of channel A and channel B of time 3 to 10, in the receiver, the information symbol of channel A of time 11 to 18 is channel A of time 3 to 10. And better quality than channel B information symbols. Considering this, it is suitable for transmitting highly important information in the information symbols of channel A at hours 11 to 18.
Also, for example, video information is transmitted using the information symbols of channel A at times 11 to 18, and high-definition video is transmitted using the information symbols of channel A and channel B at times 3 to 10. A kind of information medium can be transmitted by the information symbols of channel A of hours 11 to 18, and a kind of information medium can be transmitted by the information symbols of channel A and channel B of hours 3 to 10. Further, in the transmission with the information symbol of the channel A of the time 11 to 18, and the transmission with the information symbol of the channel A and the channel B of the time 3 to 10, the same kind of information medium may be transmitted. At this time, the same type of information has a different compression ratio at the time of coding, for example.
Also, hierarchical information such as transmitting some kind of information that is the information symbol of channel A from time 11 to 18 and transmitting difference information using the information symbol of channel A and channel B from time 3 to 10. Can also be transmitted.
The transmitting device of the present embodiment generates and transmits a signal having the frame configuration shown in FIG. 15 with the configuration shown in FIG. FIG. 16 is a diagram showing an example of the configuration of the receiving device according to the fifth embodiment of the present invention. However, for those having the same configuration as in FIG. 3, the same numbers as in FIG. 3 are assigned, and detailed description thereof will be omitted.
The signal processing unit 321 receives the channel A parallel signals 1601 and 1601 of the time when the parallel signals 306 and 316 are multiplexed from the channel A transmission line distortion parallel signals 308 and 318 and the channel B transmission line distortion parallel signals 310 and 320. It is separated into the parallel signal 1604 of channel B, the parallel signal 1601 is output to the demodulator 1602, and the parallel signal 1604 is output to the demodulator 1605.
The demodulation unit 1602 demodulates the separated parallel signal 1601 of channel A and outputs the received digital signal 1603 of channel A.
The demodulation unit 1605 demodulates the separated parallel signal 1604 of channel B and outputs the received digital signal 1606 of channel B.
The selection unit 328 selects, for example, the parallel signal having the larger electric field strength in the time of only the signal of channel A in FIG. 1 among the parallel signals 306 and 316, and outputs the selected parallel signal 1607 to the demodulation unit 1608. To do.
The demodulation unit 1608 demodulates the selected parallel signal 1607 and outputs the received digital signal 1609 of channel A.
As described above, the operations of the transmitting device and the receiving device in the present embodiment will be described in detail with reference to FIGS. 2, 15, and 16.
The operation of the receiving device will be described.
The synchronization unit 334 can synchronize the time with the transmission device by detecting the estimation symbol 103 of FIG. 15 in the reception orthogonal baseband signal 304 and the reception orthogonal baseband signal 314.
Further, the frequency offset estimation unit 332 can estimate the frequency offset from the estimation symbol 103 of FIG. 15 in the parallel signals 306 and 316.
The signal processing unit 321 separates the multiplexed signal of the information symbols of the time 3 to 10 channel A and the channel B in FIG. 15 into the signal of the channel A of the time 3 to 10 and the signal of the channel B of the time 3 to 10. , Output as a parallel signal 1601 on channel A and a parallel signal 1604 on channel B, respectively.
The demodulation unit 1602 of channel A receives the parallel signal 1601 of channel A as an input and outputs the received digital signal 1603 of channel A. Further, the demodulation unit 1605 of the channel B receives the parallel signal 1604 of the channel B as an input and outputs the received digital signal 1606 of the channel B.
The demodulation unit 1608 of channel A takes the selected parallel signal 1607 as an input, estimates the transmission line distortion from the estimation symbol 103 in FIG. 15, and parallels the channel A of time 11 to 18 from the estimated transmission line distortion. The signal is demodulated and the received digital signal 1609 is output.
At this time, the received digital signals 1603 and 1606 obtained from channel A and channel B are inferior in quality to the received digital signals 1609 of channel A, but can be transmitted at high speed. Considering this, the received digital signal 1609 of channel A is suitable for transmission of important information and control information. Further, the received digital signals 1603 and 1606 obtained from channels A and B are input to a decoder X (not shown) and decoded. Then, the received digital signal 1609 of channel A is input to the decoder Y (not shown) and decoded. As a result, different information X and Y can be obtained from different decoders X and Y, and information having the same information but different compression rates can be transmitted in the decoders X and Y.
Then, the video is transmitted by the received digital signal 1609 of the channel A, and the difference information for the high-definition video can be transmitted in layers by the received digital signals 1603 and 1606 obtained from the channels A and B.
As described above, according to the transmitting device and the receiving device of the present embodiment, there are a frame for transmitting a plurality of modulated signals from a plurality of antennas and a frame for transmitting a modulated signal from one antenna, and one important information is transmitted. By transmitting the modulated signal transmitted from one antenna, the quality of data can be ensured in the receiving device.
Further, according to the transmitting device and the receiving device of the present embodiment, different information is transmitted in a frame for transmitting a plurality of modulated signals from a plurality of antennas and a frame for transmitting a modulated signal from one antenna to obtain quality. Information with different transmission speeds can be transmitted.
In FIGS. 2, 15, and 16, multiple frames having two antennas and two channels and non-multiplexed frames have been described as examples, but the present invention is not limited to this. For example, the same can be performed for a multiple frame having three antennas and three channels, a multiple frame with two antennas and two channels, and a frame having non-multiplexed frames. ..
Moreover, the frame configuration is not limited to FIG. Then, as the communication method, the OFDM method has been described as an example, but either the multi-carrier method or the single-carrier method can be similarly implemented. Further, the spectral diffusion communication method may be used in the method of each carrier of the multi-carrier. Therefore, it can be similarly implemented in OFDM-CDM (OFDM-CDM: Orthogonal Frequency Division Multiplex Code Division Multiplex).
In addition, one antenna may form one antenna with a plurality of antennas.
(Embodiment 6) In the sixth embodiment of the present invention, when the base station communicates with a plurality of terminals, a non-multiplexed frame and a multiplexed frame are prepared as transmission frames of the base station, and either frame is used for each terminal. A communication method for transmitting a modulated signal, a transmitting device, and a receiving device will be described.
FIG. 17 is a block diagram showing an example of the configuration of the receiving device of the terminal according to the sixth embodiment of the present invention. However, for those having the same configuration as that of FIG. 3 or 16, the same numbers as those of FIG. 3 or 16 are assigned, and detailed description thereof will be omitted.
The radio wave propagation environment estimation unit 1701 receives the electric field strength, multipath environment, Doppler frequency, arrival direction, channel fluctuation, interference wave strength, and polarization state of each of the received signals received by the antenna 301 and the antenna 311 from the parallel signals 306 and 316. , Estimates the delay profile and outputs it as radio wave propagation environment information 1702.
The radio wave propagation environment information 1702 estimated by the radio wave propagation environment estimation unit 1701 of the receiving device of FIG. 17 corresponds to the radio wave propagation environment information 602 of FIG. 6, and is input to the information generation unit 604.
The information generation unit 604 receives data 601, radio wave propagation environment information 602, and required information 603 such as transmission speed, modulation method, and transmission quality required by the user or communication terminal, and generates a transmission digital signal 605. .. As a result, the terminal transmits a signal including the radio wave propagation environment when the terminal receives the modulated signal transmitted by the base station and the request information requested by the user or the terminal.
Further, the information generation unit 604 inputs data 601, radio wave propagation environment information 602, and information required by the user or communication terminal, for example, required information 603 such as transmission speed, modulation method, and transmission quality, and receives radio wave propagation environment information. From 602 and request information 603, the communication method is determined and requested, and the transmission digital signal 605 is output. At this time, the transmission digital signal 605 includes information on the required communication method. At this time, the communication method is information on whether to communicate with multiple signals or with non-multiplexed signals.
Next, a means for setting the communication method at the start of communication will be described.
In FIG. 15, when considering the reception characteristics for the radio wave propagation environment, the information symbols of channel A at times 11 to 18 are of better quality than the information symbols of channel A and channel B at times 3 to 10.
Therefore, when the terminal and the base station start communication, the base station stabilizes the system by transmitting information to the terminal with the information symbol of channel A of time 11 to 18 to maintain the data quality.
Alternatively, when the terminal and the base station start communication, the base station first transmits the estimation symbol 103 to the terminal as shown in FIG. 15, and the terminal receives the first transmitted estimation symbol 103 and receives radio waves. The propagation environment is estimated, and the terminal transmits the radio wave propagation environment estimation information and the request information. Then, the base station transmits the information with the information symbol of channel A of time 11 to 18 or the information symbol of channel A and channel B of time 3 to 10 based on the radio wave propagation environment information and the request information from the terminal. Select whether to transmit information with the information symbol and start communication. As a result, the quality of the data can be maintained and the system is stable.
Alternatively, when the terminal and the base station start communication, the base station first transmits the estimation symbol 103 to the terminal as shown in FIGS. 8 and 9, and the terminal receives the first transmitted estimation symbol 103. Then, estimate the radio wave propagation environment, consider the radio wave propagation environment estimation information and the request information, and transmit the information with the information symbol of channel A of time 11 to 18, or the information symbol of channel A of time 3 to 10 and Select whether to transmit information with the information symbol of channel B and request the base station.
From the request from the terminal, the base station may transmit information by the information symbol of channel A of time 11 to 18 or the information symbol of channel A and the information symbol of channel B of time 3 to 10. Select to start communication. As a result, the quality of the data can be maintained and the system is stable.
As described above, according to the transmitting device and the receiving device of the present embodiment, when the base station communicates with a plurality of terminals, the communication with the terminal having a poor reception state is multiplexed in the transmission frame of the base station. By allocating frames that are not used and allocating multiple frames for communication with a terminal in a good reception state, the terminal can achieve both data transmission speed and transmission quality.
In FIGS. 2, 15, and 17, multiple frames having two antennas and two channels and non-multiplexed frames have been described as examples, but the present invention is not limited to this. For example, the same can be performed for a multiple frame having three antennas and three channels, a multiple frame with two antennas and two channels, and a frame having non-multiplexed frames. .. Moreover, the frame configuration is not limited to FIG. Then, as the communication method, the OFDM method has been described as an example, but the time unit and frequency unit allocation can be carried out in the same manner by the multi-carrier method and the time unit allocation by the single carrier method. Further, the spectral diffusion communication method may be used in the method of each carrier of the multi-carrier. Therefore, it is possible to carry out the same in OFDM-CDM.
In addition, one antenna may form one antenna with a plurality of antennas.
(Embodiment 7) In Embodiment 7 of the present invention, a method of configuring a coding and a pilot symbol in a transmission method of transmitting a modulated signal of a plurality of channels to the same frequency from a plurality of antennas, and a configuration of a transmitting device and a receiving device thereof will be described.
FIG. 18 is a diagram showing an example of a transmission signal frame configuration transmitted by the base station according to the seventh embodiment of the present invention. In FIG. 18, the vertical axis represents frequency and the horizontal axis represents time.
At this time, the pilot symbol 1801 is regularly inserted into the signal of channel A by arranging it at a predetermined position in the frame. Then, the receiving device demodulates the information symbol 102 of the channel A by estimating the frequency offset and the transmission line distortion of the channel A after separating the signal of the channel A and the signal of the channel B by the pilot symbol 1801. be able to.
At this time, the pilot symbol is not inserted in the signal of channel B. At this time, by encoding the channel A or using the signal of the channel A as a pilot, the receiving device can demodulate the information symbol 102 of the channel B.
FIG. 19 is a block diagram showing an example of the configuration of the transmission device according to the seventh embodiment of the present invention. However, for those having the same configuration as in FIG. 2, the same numbers as those in FIG. 2 are assigned, and detailed description thereof will be omitted.
The coding unit 1901 encodes the transmission digital signal 211 of the channel B based on the transmission digital signal 201 of the channel A, and outputs the encoded transmission digital signal 1902 to the serial-parallel conversion unit 212.
Then, the serial-parallel transform unit 212 converts the encoded transmission digital signal 1902 into parallel data arranged according to the frame configuration signal 222, and outputs the converted parallel signal 213 to the inverse discrete Fourier transform unit 204. Specifically, the serial-parallel conversion unit 212 constitutes a frame with the configuration shown in FIG.
Next, the configuration of the receiving device will be described. FIG. 20 is a block diagram showing an example of the configuration of the receiving device according to the seventh embodiment of the present invention. However, for those having the same configuration as that shown in FIG. 3, the same numbers as those shown in FIG. 3 are assigned, and detailed description thereof will be omitted. The demodulation unit 2003 demodulates the separated parallel signal 2001 of channel A and outputs the received digital signal 2004 of channel A.
The demodulation unit 2005 demodulates the separated parallel signal 2002 of channel B using the separated parallel signal 2001 of channel A, and outputs the received digital signal 2006 of channel B.
Next, an operation of encoding and decoding the channel B signal based on the channel A signal using the transmission device and the reception device will be described.
FIG. 21 is a diagram showing an example of signal point arrangement on the IQ plane when the signal of channel B is differentially coded with respect to the signal of channel A. In FIG. 21, channel A and channel B are QPSK (Quadrature Phase Shift Keying) modulated signals.
The signal points when transmitting information '00' at channel A carrier 1 time 4 are arranged as shown in FIG. 21 (a). At this time, since channel B carrier 1 time 4 is differentially coded with respect to channel A carrier 1 time 4, when transmitting information in '00''01'' 11''10', FIG. 21 (b) ), Arrange the signal points. That is, the position of the symbol received by channel A is set as the reference position when demodulating the symbol of channel B (in other words, the symbol position of information '00' in channel B).
Similarly, the signal points when transmitting information '01' at channel A carrier 1 time 4 are arranged as shown in FIG. 21 (c). At this time, since channel B carrier 1 time 4 is differentially coded with respect to channel A carrier 1 time 4, when transmitting information in '00''01'' 11''10', FIG. 21 (d) ), Arrange the signal points.
Similarly, the signal points when transmitting information '11' at channel A carrier 1 time 4 are arranged as shown in FIG. 21 (e). At this time, since channel B carrier 1 time 4 is differentially coded with respect to channel A carrier 1 time 4, when transmitting information in '00''01'' 11''10', FIG. 21 (f) ), Arrange the signal points.
Similarly, the signal points when transmitting information '10' at channel A carrier 1 time 4 are arranged as shown in FIG. 21 (g). At this time, since channel B carrier 1 time 4 is differentially coded with respect to channel A carrier 1 time 4, when transmitting information in '00''01'' 11''10', FIG. 21 (h). ), Arrange the signal points.
Next, an example of operation coding by BPSK modulation will be described. FIG. 22 is a diagram showing an example of signal point arrangement on the IQ plane when the signal of channel B is differentially coded with respect to the signal of channel A. In FIG. 22, channel A and channel B are BPSK-modulated signals.
The signal points for transmitting information '1' at channel A carrier 1 time 4 are arranged at 2201 as shown in FIG. 22 (a). At this time, since channel B carrier 1 time 4 is differentially coded with respect to channel A carrier 1 time 4, when transmitting information '0', a signal point is set at 2202 as shown in FIG. 22 (b). Place and place the signal point at 2203 when transmitting '1'. That is, the position of the symbol received by channel A is set as the reference position when demodulating the symbol of channel B (in other words, the symbol position of information '1' in channel B).
On the other hand, the signal points when transmitting information '0' at channel A carrier 1 time 4 are arranged at 2204 as shown in FIG. 22 (c). At this time, since channel B carrier 1 time 4 is differentially coded with respect to channel A carrier 1 time 4, when transmitting information '0', a signal point is set at 2206 as shown in FIG. 22 (d). Place and place the signal point at 2205 when transmitting '1'.
Next, an example will be described in which the signal of channel A, which is the reference of coding, is BPSK, and the signal of channel B, which is encoded based on channel A, is QPSK. In FIG. 23, the signal point arrangement on the IQ plane of the multi-valued modulation of channel B (QPSK modulation in this case) is performed based on the PSK modulation of channel A (BPSK (BPSK: Binary Phase Shift Keying) modulation in this case). It is a figure which shows an example at the time. At this time, it is assumed that the modulation methods of channel A and channel B are different. Another feature is that the modulation method of channel A is PSK modulation.
The signal points when transmitting information '0' at channel A carrier 1 time 4 are arranged as shown in FIG. 23 (a). At this time, the channel B carrier 1 time 4 determines the signal point arrangement for the information '00', '01', '11', and '10' with respect to the signal point arrangement of the channel A carrier 1 time 4. The signal point arrangement at that time is shown in FIG. 23 (b). That is, the point whose phase is advanced by 45 degrees from the position of the symbol received by channel A is set as the reference position when demodulating the symbol of channel B (in other words, the symbol position of information '00' in channel B).
Similarly, the signal points when transmitting information '1' at channel A carrier 1 time 4 are arranged as shown in FIG. 23 (c). At this time, the channel B carrier 1 time 4 determines the signal point arrangement for the information '00', '01', '11', and '10' with respect to the signal point arrangement of the channel A carrier 1 time 4. The signal point arrangement at that time is shown in FIG. 23 (d).
Next, an example will be described in which the signal of channel A, which is the reference of coding, is BPSK, and the signal of channel B, which is encoded based on channel A, is 16QAM. In FIG. 24, the signal point arrangement on the IQ plane of channel B multi-level modulation (here 16QAM (16QAM: 16 Quadrature Amplitude Modulation)) is performed based on the PSK modulation of channel A (here, BPSK modulation). It is a figure which shows an example of time. In FIG. 24, it is assumed that the modulation methods of channel A and channel B are different. Another feature is that the modulation method of channel A is PSK modulation.
Channel A Carrier 1 Arrange the signal points when transmitting information '0' at time 4 as shown in FIG. 24 (a). At this time, the channel B carrier 1 time 4 determines the signal point arrangement for the information 4-bit '0000', ..., '1111' based on the position of the signal point received at the channel A carrier 1 time 4. .. The signal point arrangement at that time is shown in FIG. 24 (b).
Similarly, the signal points when transmitting information '1' at channel A carrier 1 time 4 are arranged as shown in FIG. 24 (c). At this time, the channel B carrier 1 time 4 determines the signal point arrangement for the information 4-bit '0000', ..., '1111' with respect to the signal point arrangement of the channel A carrier 1 time 4. The signal point arrangement at that time is shown in FIG. 24 (d).
FIG. 25 is a diagram showing an example of signal point arrangement on the IQ plane of multi-level modulation of channel B (16QAM in this case) based on PSK modulation of channel A (QPSK modulation in this case). .. At this time, it is assumed that the modulation methods of channel A and channel B are different. Another feature is that the modulation method of channel A is PSK modulation.
When transmitting information '00' at channel A carrier 1 time 4, channel B carrier 1 time 4 has information 4 bits '0000', ..., For signal point arrangement 2501 at channel A carrier 1 time 4. Determine the signal point arrangement for '1111'. The signal point arrangement at that time is shown in FIG. 25 (a).
When transmitting information '01' at channel A carrier 1 time 4, channel B carrier 1 time 4 has information 4 bits '0000', ..., For the signal point arrangement 2502 at channel A carrier 1 time 4. Determine the signal point arrangement for '1111'. The signal point arrangement at that time is shown in FIG. 25 (b).
When transmitting information '11' at channel A carrier 1 time 4, channel B carrier 1 time 4 has information 4 bits '0000' for channel A carrier 1 time 4 signal point arrangement 2503, ... Determine the signal point arrangement for '1111'. The signal point arrangement at that time is shown in FIG. 25 (c).
When transmitting information '10' at channel A carrier 1 time 4, channel B carrier 1 time 4 has information 4 bits '0000' for channel A carrier 1 time 4 signal point arrangement 2504, ... Determine the signal point arrangement for '1111'. The signal point arrangement at that time is shown in FIG. 25 (d).
FIG. 26 is a diagram showing an example of a frame configuration of the base station transmission signal of the present embodiment. In FIG. 26, the pilot symbol 1801 is regularly inserted in both channel A and channel B.
At this time, the estimation symbol 103 is a symbol used to separate channel A and channel B in the receiver, and the pilot symbol 1801 of channel A is after the signals of channel A and channel B are separated in the receiver. It is a symbol for estimating distortion components such as transmission line distortion and frequency offset of the signal of channel A in the demodulation unit of channel A.
Similarly, the pilot symbol 1801 of channel B is used to estimate distortion components such as transmission path distortion and frequency offset of the signal of channel B in the demodulation section of channel B after the signals of channel A and channel B are separated in the receiver. Is a symbol of.
In FIG. 26, the estimation symbol 103 for signal separation between channel A and channel B is not multiplexed in channel A and channel B. The pilot symbol 1801 mentioned above is characterized by being multiplexed.
At this time, the estimation symbol 103 and the pilot symbol 1801 are both known reference symbols (known pilots), for example. However, their role in the receiver is different. The estimation symbol 103 is used for signal processing to separate the multiplexed signals of channel A and channel B.
Then, when demodulating the information symbol of channel A, the pilot symbol 1801 of channel A and the pilot symbol 1801 of channel B are used to estimate the transmission line distortion, the frequency offset, the phase in the IQ plane, and the amplitude.
Similarly, when demodulating channel B information symbols, channel A pilot symbol 1801 and channel B pilot symbol 1801 are used to estimate transmission line distortion, frequency offset, phase in IQ plane, and amplitude.
Then, the modulation signal is generated from the information of the frame configuration of FIG. 26 included in the frame configuration signal 222 output from the frame configuration signal generation unit 221 of FIG.
Next, the arrangement of the pilot symbols of the present embodiment will be described. FIG. 27 is a diagram showing an example of signal point arrangement in the IQ plane of the pilot symbol in the present embodiment.
In FIG. 27, 2701 shows a known pilot symbol, which is a signal point arrangement at a specific position. 2702 represents a known BPSK pilot symbol, which is BPSK modulated but regularly arranged.
FIG. 28 is a diagram showing an example of a frame configuration of a base station transmission signal according to the present embodiment. In FIG. 28, the vertical axis represents frequency and the horizontal axis represents time. In FIG. 28, a pilot symbol is not inserted in order to estimate distortion such as transmission line distortion and frequency offset after channel A and channel B are separated. Another feature is that the modulation method of channel A is PSK modulation.
At this time, the channel A is differentially coded on the frequency axis or the time axis. Then, in channel B, information bits are assigned to the signal point arrangement of channel A.
Next, in the frame configuration of FIG. 28, a method of differentially coding channel A and channel B and a method of arranging the signal points of channel B with reference to the signal points of channel A will be described.
In FIG. 28, channel A is PSK modulated and differentially coded with, for example, a symbol next to the frequency axis or time axis. This eliminates the need to insert pilot symbols. Then, for example, as shown in FIGS. 21 and 22, channel A and channel B are differentially coded. Alternatively, as shown in FIGS. 23, 24, and 25, the signal points of channel B are arranged with reference to the signal points of channel A.
By encoding in this way, the receiver can estimate the transmission line distortion, frequency offset, and phase in the IQ plane from the signal of channel A when demodulating the signal of channel B, that is, the pilot. It can be a symbol.
19 and 20 are examples of the configurations of the transmitting device and the receiving device at this time. At this time, the difference in operation from when transmitting and receiving the frame of FIG. 18 is that the transmission digital signal 201 of channel A is differentially coded in FIG. 19, and that of channel A of FIG. 20 The demodulation unit 2003 performs differential detection (delayed detection) and outputs the received digital signal 2004 of channel A.
FIG. 29 is a diagram showing an example of the configuration of the receiving device according to the present embodiment. However, for those having the same configuration as in FIG. 3, the same numbers as those in FIG. 3 are assigned, and detailed description thereof will be omitted.
The demodulation unit 2903 demodulates the separated parallel signal 2901 of channel A and outputs the received digital signal 2904.
The demodulation unit 2905 demodulates the separated parallel signal 2902 of channel B and outputs the received digital signal 2906.
FIG. 30 is a block diagram showing an example of the demodulation unit of the present embodiment. Specifically, FIG. 30 shows the configuration of the demodulation unit of channel B as an example of the configuration of the demodulation unit of channel A and channel B in the present embodiment.
The transmission line distortion estimation unit 3002 estimates the transmission line distortion from the parallel signal 3001 of the channel B, and outputs the transmission line distortion estimation signal 3003 to the information symbol demodulation unit 3006.
The frequency offset estimation unit 3004 estimates the frequency offset from the parallel signal 3001 of the channel B, and outputs the frequency offset estimation signal 3005 to the information symbol demodulation unit 3006.
The information symbol demodulation unit 3006 demodulates the parallel signal 3001 of channel B using the transmission line distortion estimation signal 3003 and the frequency offset estimation signal 3005, and outputs the received digital signal 3007.
FIG. 31 is a block diagram showing an example of the demodulation unit of the present embodiment. Specifically, FIG. 31 shows the configuration of the demodulation unit of channel B as an example of the configuration of the demodulation unit of channel A and channel B in the present embodiment.
The transmission line distortion estimation unit 3102 estimates the transmission line distortion from the parallel signal 3108 of channel A, and outputs the transmission line distortion estimation signal 3103 to the information symbol demodulation unit 3106.
The frequency offset estimation unit 3104 estimates the frequency offset from the parallel signal 3108 of the channel A, and outputs the frequency offset estimation signal 3105 to the information symbol demodulation unit 3106.
The information symbol demodulation unit 3106 demodulates the parallel signal 3101 of channel B by using the transmission line distortion estimation signal 3103 and the frequency offset estimation signal 3105, and outputs the received digital signal 3107 of channel B.
FIG. 32 is a block diagram showing an example of the demodulation unit of the present embodiment. Specifically, FIG. 32 shows the configuration of the demodulation unit of channel B as an example of the configuration of the demodulation unit of channel A and channel B in the present embodiment.
The transmission line distortion estimation unit 3202 estimates the transmission line distortion from the parallel signal 3201 of channel B and the parallel signal 3208 of channel A, and outputs the transmission line distortion estimation signal 3203 to the information symbol demodulation unit 3206.
The frequency offset estimation unit 3204 estimates the frequency offset from the parallel signal 3201 of channel B and the parallel signal 3208 of channel A, and outputs the frequency offset estimation signal 3205 to the information symbol demodulation unit 3206.
The information symbol demodulation unit 3206 demodulates the parallel signal 3201 of channel B by using the transmission line distortion estimation signal 3203 and the frequency offset estimation signal 3205, and outputs the received digital signal 3207 of channel B.
FIG. 33 is a block diagram showing an example of the demodulation unit of the present embodiment. Specifically, FIG. 33 shows the configuration of the demodulation unit of channel B as an example of the configuration of the demodulation unit of channel A and channel B in the present embodiment.
The information symbol demodulation unit 3303 demodulates the parallel signal 3301 of channel B by using the parallel signal 3302 of channel A, and outputs the received digital signal 3304 of channel B.
FIG. 34 is a block diagram showing an example of the configuration of the receiving device according to the present embodiment. However, for those having the same configuration as that of FIG. 3 or 29, the same numbers as those of FIG. 3 or 29 are assigned, and detailed description thereof will be omitted.
The features of FIG. 34 are that the parallel signal 2901 of the separated channel A and the parallel signal 2902 of the separated channel B are input to the demodulator 2903 of the channel A, and the parallel signal of the separated channel A. The demodulation of channel A is performed by the parallel signal 2902 of 2901 and the separated channel B.
Similarly, the demodulation section 2905 of channel B receives the parallel signal 2901 of the separated channel A and the parallel signal 2902 of the separated channel B, and the parallel signal 2901 of the separated channel A and the separation. The feature of FIG. 34 is that the demodulation of channel B is performed by the parallel signal 2902 of channel B.
In FIG. 34, an example of the configuration of the demodulation unit of channel A and channel B is shown in FIG. That is, the demodulation unit 2903 and the demodulation unit 2905 are composed of the demodulation unit shown in FIG. 32. Here, the demodulation unit 2903 of channel A will be described as an example.
The transmission line distortion estimation unit 3202 uses the parallel signal 3201 of channel A corresponding to the parallel signal 2901 of the separated channel A in FIG. 34 and the parallel signal of channel B corresponding to the parallel signal 2902 of the separated channel B in FIG. 3208 The pilot symbols inserted in channel A and channel B are extracted from FIG. 26, the transmission line distortion is estimated, and the transmission line distortion estimation signal 3203 is output to the information symbol demodulation unit 3206.
Similarly, the frequency offset estimation unit 3204 of the parallel signal 3201 of the channel A corresponding to the parallel signal 2901 of the separated channel A in FIG. 34 and the parallel signal 2902 of the separated channel B of FIG. 34 Parallel signal 3208 The pilot symbols inserted in channel A and channel B are extracted from FIG. 26, the frequency offset is estimated, and the frequency offset estimation signal 3205 is output to the information symbol demodulation unit 3206.
Then, the information symbol demodulation unit 3206 uses the transmission line distortion estimation signal 3203 and the frequency offset estimation signal 3205 to remove distortions such as frequency offset and transmission line distortion from the parallel signal 3201 of channel A, demodulate the signal, and demodulate the channel A. The received digital signal 3207 is output.
By estimating the transmission line distortion and frequency offset estimation using the pilot symbols of channel A and channel B in this way, the estimation accuracy is improved and the reception sensitivity characteristic is improved.
As described above, in FIG. 32, the configuration including the transmission line distortion estimation unit and the frequency offset estimation unit has been described, but the same can be applied to a configuration including only one of them.
FIG. 35 is a block diagram showing an example of the demodulation unit of the present embodiment. Specifically, FIG. 35 shows the configuration of the demodulation unit of channel B as an example of the configuration of the demodulation unit of channel A and channel B in the present embodiment. However, for those having the same configuration as that shown in FIG. 32, the same numbers as those shown in FIG. 32 are assigned, and detailed description thereof will be omitted.
Next, the demodulation unit of the receiving device of the present embodiment will be described. FIG. 30 is a block diagram showing the configuration of the receiving device of the present embodiment. Specifically, FIG. 30 is a block diagram showing a detailed configuration of the demodulation unit 2003 of FIG. 20.
In FIG. 30, the transmission line distortion estimation unit 3002 is inserted into a pilot symbol from the parallel signal 3001 of channel A corresponding to the parallel signal 2001 of the separated channel A of FIG. 20, for example, the pilot inserted into the channel A of FIG. The symbol 1801 is extracted and the transmission line distortion is estimated.
Similarly, the frequency offset estimation unit 3004 extracts a pilot symbol, for example, the pilot symbol 1801 inserted in the channel A of FIG. 18 from the parallel signal 3001 of the channel A, and estimates the frequency offset.
Then, the information symbol demodulation unit 3006 uses the transmission line distortion estimation signal 3003 and the frequency offset estimation signal 3005 to remove distortions such as frequency offset and transmission line distortion from the parallel signal 3001 of channel A and demodulate them.
The demodulation unit 2005 of channel B takes the separated parallel signal 2001 of channel A and the parallel signal 2002 of the separated channel B as inputs, demodulates the information symbol 102 of channel B in FIG. 18, and receives the digital signal of channel B. Output 2006. Figures 33 and 35 show the detailed configuration of the demodulation section 2005 of channel B at this time.
In FIG. 33, the information symbol demodulation unit 3303 corresponds to the parallel signal 3302 of the channel A corresponding to the parallel signal 2001 of the separated channel A in FIG. 20, and the channel B corresponding to the parallel signal 2002 of the separated channel B in FIG. Differential detection (delayed detection) is performed using the parallel signal 3301 of.
In FIG. 35, the transmission line distortion estimation unit 3202 has a pilot symbol from the parallel signal 3208 of channel A corresponding to the parallel signal 2001 of the separated channel A of FIG. 20, for example, the pilot symbol 1801 of channel A of FIG. Is extracted and the transmission line distortion is estimated.
Similarly, the frequency offset estimation unit 3204 extracts a pilot symbol, for example, the pilot symbol 1801 of the channel A of FIG. 18 from the parallel signal 3208 of the channel A corresponding to the parallel signal 2001 of the separated channel A of FIG. And estimate the frequency offset.
Then, the information symbol demodulation unit 3206 uses the transmission line distortion estimation signal 3203 and the frequency offset estimation signal 3205 to remove distortions such as frequency offset and transmission line distortion from the parallel signal 3208 of channel A and the parallel signal 3201 of channel B. , The parallel signal of channel B and the parallel signal of channel A are differentially detected (delayed detection), and the received digital signal 3207 of channel B is output.
As described above, according to the transmitting device and the receiving device of the present embodiment, the signal of channel B is differentially coded by the signal of channel A, and the pilot symbol is not inserted in channel B, so that channel B is used. This has the effect of improving the transmission speed compared to a system with a pilot symbol inserted.
The method of differential coding of channel A and channel B is not limited to this. For example, only a specific symbol may be differentially coded. Further, the symbols for differential coding of channel A and channel B do not have to be symbols of the same carrier and the same time. Further, as an example of differential coding, BPSK and QPSK have been described, but the present invention is not limited to this, and it is easy to carry out especially in the case of PSK modulation. In addition, it is necessary to always transmit the reference channel for differential coding. Then, it is suitable for transmitting control information, for example, communication status, channel configuration information, and the like to the channel.
Further, in FIGS. 31 and 35, the configuration including the transmission line distortion estimation unit and the frequency offset estimation unit has been described, but the same can be applied to a configuration including only one of them.
The transmitter and receiver are not limited to the configurations shown in FIGS. 19 and 20, and the multiple frames having two antennas and two channels and the non-multiplexed frames have been described as examples. It is not limited to. For example, the same can be applied to a multiple frame with three antennas and three channels, and a multiple frame with two antennas and two channels. At this time, in the case of 3 channel multiplexing, if the channel to be added is channel C, channel C is differentially coded with channel A. Moreover, the frame configuration is not limited to FIG. Then, as the communication method, the OFDM method has been described as an example, but the multi-carrier method, the spread spectrum communication method, and the single carrier method can be similarly implemented. Further, the spectral diffusion communication method may be used in the method of each carrier of the multi-carrier. Therefore, it is possible to carry out the same in OFDM-CDM.
In addition, one antenna may form one antenna with a plurality of antennas.
Next, a case where channel B is encoded based on the signal of channel A will be described.
Further, the method of encoding the channel A and the channel B is not limited to this, and for example, only a specific symbol may be encoded. Further, the symbols encoded by channel A and channel B do not have to be symbols of the same carrier and the same time. Further, as an example of coding, channel A has been described by BPSK and QPSK, but the present invention is not limited to this, and it is easy to carry out especially in the case of PSK modulation. In addition, it is necessary to always transmit the reference channel for coding. Then, it is suitable for transmitting control information, for example, communication status, channel configuration information, and the like to the channel.
Further, in FIG. 35, the configuration including the transmission line distortion estimation unit and the frequency offset estimation unit has been described, but the same can be applied to a configuration including only one of them.
The transmitter and receiver are not limited to the configurations shown in FIGS. 19 and 20, and the multiple frames having two antennas and two channels and the non-multiplexed frames have been described as examples. It is not limited to. For example, the same can be applied to a multiple frame with three antennas and three channels, and a multiple frame with two antennas and two channels. At this time, in the case of multiplexing 3 channels, if the channel to be added is channel C, channel C encodes channel A and channel A. Moreover, the frame configuration is not limited to FIG. Then, as the communication method, the OFDM method has been described as an example, but the multi-carrier method, the spread spectrum communication method, and the single carrier method can be similarly implemented. Further, the spectral diffusion communication method may be used in the method of each carrier of the multi-carrier. Therefore, it can be similarly implemented in OFDM-CDM (OFDM-CDM: Orthogonal Frequency Division Multiplex Code Division Multiplex).
In addition, one antenna may form one antenna with a plurality of antennas.
In the above description, the coding method of channel A and channel B is not limited to this, and for example, only a specific symbol may be encoded. Further, the symbols encoded by channel A and channel B do not have to be symbols of the same carrier and the same time. Further, as an example of coding, channel A has been described by BPSK and QPSK, but the present invention is not limited to this, and it is easy to carry out especially in the case of PSK modulation. In addition, it is necessary to always transmit the reference channel for differential coding. Then, it is suitable for transmitting control information, for example, communication status, channel configuration information, and the like to the channel.
The transmitter and receiver are not limited to the configurations shown in FIGS. 19 and 20, and the multiple frames having two antennas and two channels and the non-multiplexed frames have been described as examples. It is not limited to. For example, the same can be applied to a multiple frame with three antennas and three channels, and a multiple frame with two antennas and two channels. At this time, in the case of multiplexing 3 channels, if the channel to be added is channel C, channel C encodes channel A and channel A. Moreover, the frame configuration is not limited to FIG. 28. Then, as the communication method, the OFDM method has been described as an example, but the multi-carrier method, the spread spectrum communication method, and the single carrier method can be similarly implemented. Further, the spectral diffusion communication method may be used in the method of each carrier of the multi-carrier. Therefore, it is possible to carry out the same in OFDM-CDM.
In addition, one antenna may form one antenna with a plurality of antennas.
As described above, channel A is differentially coded on the frequency axis or the time axis, the signal of channel B is encoded by the signal of channel A, and no pilot symbol is inserted in channel A and channel B. There is an effect that the transmission speed is improved as compared with the system in which the pilot symbol is inserted in the channel A and the channel B.
Next, a method of inserting a pilot symbol into channel A and channel B will be described with reference to FIGS. 2, 26, 29, 32, and 34.
The transmitting device and the receiving device are not limited to the configurations shown in FIGS. 2 and 34, and a multi-frame having two antennas and two channels and a non-multiplexed frame have been described as an example. It is not limited to. For example, the same can be applied to a multiple frame with three antennas and three channels, and a multiple frame with two antennas and two channels. At this time, when 3 channels are multiplexed, the estimation accuracy is further improved by estimating the transmission line distortion and the frequency offset using the pilot symbols for 3 channels. Moreover, the frame configuration is not limited to FIG. 26. Then, as the communication method, the OFDM method has been described as an example, but the multi-carrier method, the spread spectrum communication method, and the single carrier method can be similarly implemented. Further, the spectral diffusion communication method may be used in the method of each carrier of the multi-carrier. Therefore, it is possible to carry out the same in OFDM-CDM.
In addition, one antenna may form one antenna with a plurality of antennas.
As described above, according to the transmitting device and the receiving device of the present embodiment, the estimation accuracy is improved by estimating the frequency offset and the transmission line distortion by using the pilots of channel A and channel B, whereby the channel is improved. The effect of improving the reception sensitivity of demodulation of A and channel B can be obtained.
(Embodiment 8) In the eighth embodiment of the present invention, in the transmission method of transmitting modulated signals of a plurality of channels from a plurality of antennas in the same frequency band, one frequency source for the transmission baseband and one frequency source for the radio unit are used. A transmitting device provided, and a receiving device including one frequency source for the receiving baseband and one frequency source for the radio unit will be described.
FIG. 36 is a block diagram showing an example of the configuration of the transmission device according to the eighth embodiment of the present invention. However, for those having the same configuration as that shown in FIG. 2, the same numbers as those shown in FIG. 2 are assigned, and detailed description thereof will be omitted.
The frequency source 3601 generates an operating frequency signal 3602 for a transmission baseband signal, and converts the operating frequency signal 3602 into a serial parallel transform unit 202, an inverse discrete Fourier transform unit 204, a serial parallel transform unit 212, an inverse discrete Fourier transform unit 214, And output to the frame configuration signal generation unit 221.
The frequency source 3603 generates an operating frequency signal 3604 for the radio unit, and outputs the operating frequency signal 3604 to the radio unit 206 and the radio unit 216.
The operation of the transmitter of FIG. 36 will be described below. In FIG. 36, the frequency source 3601 produces the operating frequency signal 3602.
Then, the serial-parallel transform units 202 and 212 and the inverse discrete Fourier transform units 204 and 214 perform signal processing in synchronization with the operating frequency signal 3602.
Similarly, the frequency source 3603 produces an operating frequency signal 3604.
Then, the radio units 206 and 216 perform frequency conversion of the signals 205 and 215 after the discrete Fourier transform in synchronization with the operating frequency signal 3604, and output the transmission signals 207 and 217.
As described above, according to the transmitting device of the present embodiment, the frequency sources can be reduced as compared with the case where the frequency sources are separately owned for each antenna. By sharing the frequency source in the transmitting device, frequency synchronization and time synchronization between the channel A signal and the channel B signal in the receiving device can be easily performed. This is because the frequency source is shared by channel A and channel B, so there is no need to synchronize them separately.
Next, the receiving side will be described. FIG. 37 is a block diagram showing an example of the configuration of the receiving device according to the eighth embodiment of the present invention. However, for those having the same configuration as that shown in FIG. 3, the same numbers as those shown in FIG. 3 are assigned, and detailed description thereof will be omitted.
The frequency source 3701 generates an operating frequency signal 3702 for the reception baseband, and outputs the operating frequency signal 3702 to the synchronization unit 334.
The frequency source 3703 generates an operating frequency signal 3704 for the radio unit, and outputs the operating frequency signal 3704 to the radio unit 303 and the radio unit 313.
Next, the operation of the receiving device of FIG. 37 will be described.
The frequency source 3701 for the receive baseband produces the operating frequency signal 3702.
The synchronization unit 334 compares the operating frequency signal 3702 with the synchronization timing acquired by the reception orthogonal baseband signals 304 and 314, and generates a timing signal 335 synchronized with the transmission device.
The frequency source 3703 uses the frequency offset estimation signal 333 to control the frequency in synchronization with the transmitter to generate the operating frequency signal 3704.
The radio units 303 and 314 frequency-convert the received signals 302 and 312 based on the operating frequency signal 3704, respectively.
As described above, according to the receiving device of the present embodiment, the frequency sources can be reduced as compared with the case where the frequency sources are separately owned for each antenna. Then, frequency synchronization and time synchronization between the signal of channel A and the signal of channel B can be easily performed.
The transmitting device and the receiving device are not limited to the configurations shown in FIGS. 36 and 37, and the multiple frames having two antennas and the number of channels 2 and the non-multiplexed frames have been described as examples. It is not limited to. For example, the same can be applied to a multiple frame with three antennas and three channels, and a multiple frame with two antennas and two channels. Then, as the communication method, the OFDM method has been described as an example, but the multi-carrier method, the spread spectrum communication method, and the single carrier method can be similarly implemented. Further, the spectral diffusion communication method may be used in the method of each carrier of the multi-carrier. Therefore, it is possible to carry out the same in OFDM-CDM.
In addition, one antenna may form one antenna with a plurality of antennas.
As described above, in the transmission method of transmitting modulated signals of a plurality of channels from a plurality of antennas in the same frequency band, a transmission device including one frequency source for the transmission baseband and one frequency source for the radio unit. , And, by using a receiving device having one frequency source for the receiving baseband and one frequency source for the radio unit, compared with the case where the transmitting device has a frequency source separately for each antenna, The frequency source can be reduced. Then, by sharing the frequency source between the transmitting devices, frequency synchronization and time synchronization between the channel A signal and the channel B signal in the receiving device can be easily performed.
(Embodiment 9) In the ninth embodiment of the present invention, a communication method for transmitting signals of a plurality of channels from a plurality of antennas and a communication method for transmitting signals of one channel are switched depending on the environment, and a transmitting device and a receiving device. The configuration of is described.
FIG. 38 is a diagram showing an example of the arrangement of base stations in the ninth embodiment of the present invention. In FIG. 38, the base station 3801 transmits a modulated signal at the frequency f1, and its communication limit is 3802. Similarly, base station 3803 transmits a modulated signal at frequency f2, and its communication limit is 3804. In FIG. 38, it is assumed that the base station 3801 that transmits the modulated signal of the frequency f1 and the base station 3803 that transmits the modulated signal of the frequency f2 are installed at substantially the same location.
The base station device and the communication terminal device of the present embodiment adaptively transmit signals of a communication method for multiplexing signals of a plurality of channels using a plurality of antennas and signals of one channel according to a radio wave propagation environment and a communication area. Switch.
The base station 3801 transmits the signal having the frame configuration shown in FIG. 8 at the frequency f1.
Further, the base station 3803 transmits a signal having a frame configuration shown in FIG. 9 at a frequency f2. Then, the frequency f1 and the frequency f2 are arranged as shown in FIG.
It is assumed that the base station 3801 is configured as shown in FIG. 2, and signals of a plurality of channels are multiplexed and transmitted from a plurality of antennas. Here, for example, signals of two channels are multiplexed and transmitted from two antennas in a frame configuration as shown in FIG.
The details of the receiving device of this base station 3801 will be described. FIG. 39 is a block diagram showing a configuration of a receiving device of a base station according to a ninth embodiment of the present invention. FIG. 39 shows an example of the configuration of the receiving device of the base station 3801 and the base station 3803. In FIG. 39, the radio unit 3903 converts the received signal 3902 received by the receiving antenna 3901 into a baseband frequency, and outputs the received orthogonal baseband signal 3904 to the demodulation unit 3905.
The demodulation unit 3905 demodulates the reception orthogonal baseband signal 3904 and outputs the reception digital signal 3906.
Next, the details of the transmitter of the base station 3801 will be described. FIG. 40 is a block diagram showing a configuration of a transmission device of the base station according to the ninth embodiment of the present invention. FIG. 40 shows an example of the configuration of the transmission device of the base station 3803 according to the present embodiment. In FIG. 40, the serial-parallel transform unit 4002 constitutes a frame from the transmission digital signal 4001 and outputs the parallel signal 4003 to the inverse discrete Fourier transform unit 4004.
The inverse discrete Fourier transform unit 4004 performs an inverse Fourier transform on the parallel signal 4003, and outputs the signal 4005 after the inverse Fourier transform to the radio unit 4006.
The radio unit 4006 converts the signal 4005 after the inverse Fourier transform into a radio frequency, and the transmission signal 4007 is output as a radio wave from the antenna 4008.
FIG. 41 is a diagram showing an example of the configuration of the receiving device of the terminal according to the ninth embodiment of the present invention. However, for those having the same configuration as that of FIG. 12 or 13, the same numbers as those of FIG. 12 or 13 are assigned, and detailed description thereof will be omitted. The receiver of FIG. 41 is composed of a receiver for demodulating channel A and channel B of frequency f1 and a receiver for demodulating channel C of frequency f2 with two antennas.
The radio wave propagation environment estimation unit 1301 estimates the radio wave propagation environment of the multiple signals of the frequency f1 channel A and channel B, and outputs the radio wave propagation environment estimation information 1302.
Then, the radio wave propagation environment estimation unit 1303 estimates the radio wave propagation environment of the signal of the channel C of the frequency f2, and outputs the radio wave propagation environment estimation information 1304.
The communication method determination unit 4101 determines whether to communicate with the frequency f1, that is, the base station 3801 or the frequency f2, that is, the base station 3803 from the radio wave propagation environment estimation information 1302 and 1304, and outputs the determination communication method signal 4102. ..
FIG. 42 is a diagram showing an example of the configuration of the transmission device of the terminal according to the ninth embodiment of the present invention. The transmitter of FIG. 42 is composed of a modulated signal transmitter having a frequency f1 and a modulated signal transmitter having a frequency f2.
The communication method selection unit 4203 receives the determination communication method signal 4202 as an input, and outputs the transmission digital signal 4201 to the modulation signal generation unit 4205 or the modulation signal generation unit 4211 by the communication method included in the determination communication method signal 4202. That is, when transmitting at the frequency f1, the communication method selection unit 4203 outputs the transmission digital signal 4201 as the transmission digital signal 4204 for the frequency f1 to the modulation signal generation unit 4205. When transmitting at frequency f2, the communication method selection unit 4203 outputs the transmission digital signal 4201 as the transmission digital signal 4210 for frequency f2 to the modulation signal generation unit 4211.
The modulation signal generation unit 4205 modulates the transmission digital signal 4204 for frequency f1 and outputs the transmission orthogonal baseband signal 4206 to the radio unit 4207.
The radio unit 4207 converts the transmission orthogonal baseband signal 4206 to the radio frequency f1, and the modulated signal 4208 at the frequency f1 is output as a radio wave from the antenna 4209.
The modulation signal generation unit 4211 modulates the transmission digital signal 4210 for frequency f2 and outputs the transmission orthogonal baseband signal 4212 to the radio unit 4213.
The radio unit 4213 converts the transmission orthogonal baseband signal 4212 to the radio frequency f2, and the modulated signal 4214 of the frequency f2 is output as a radio wave from the antenna 4215.
FIG. 43 is a diagram showing an example of the arrangement of base stations in the ninth embodiment of the present invention. However, for those having the same configuration as that in FIG. 38, the same numbers as those in FIG. 38 are assigned, and detailed description thereof will be omitted.
As shown in FIG. 38, at points A and D, the modulation signal transmitted by the base station 3801 that transmits the modulation signal of frequency f1 can be received, and at points B and C, the base station 3803 that transmits the modulation signal of frequency f2. Can receive the modulated signal transmitted by.
At this time, for example, it is assumed that the terminal is at the point A or D. Then, the radio wave propagation environment estimation unit 1301 of the receiving device of the terminal of FIG. 41 outputs a signal indicating that a signal of frequency f1 exists as radio wave propagation environment estimation information 1302. Then, the radio wave propagation environment estimation unit 1303 outputs a signal indicating that the signal of the frequency f2 does not exist as the radio wave propagation environment estimation information 1304.
Also, it is assumed that the terminal is at point B or C. Then, the radio wave propagation environment estimation unit 1301 of the receiver of the terminal in FIG. 41 outputs a signal indicating that the signal of frequency f1 does not exist as the radio wave propagation environment estimation information 1302. Then, the radio wave propagation environment estimation unit 1303 outputs a signal indicating that a signal having a frequency f2 exists as radio wave propagation environment estimation information 1304.
The communication method determination unit 4101 receives the above-mentioned radio wave propagation environment estimation information 1302 and 1304 as inputs, determines that communication is performed at the frequency f1 or f2 in which the modulated signal exists, and outputs the determination communication method signal 4102.
Further, when there is a base station 3801 that transmits a modulated signal of frequency f1 and a base station 3803 that transmits a modulated signal of frequency f2 as shown in FIG. 43, the signal of frequency f1 exists in the radio wave propagation environment estimation unit 1301. The signal indicating that the signal is transmitted is output as the radio wave propagation environment estimation information 1302. Then, the radio wave propagation environment estimation unit 1303 also outputs a signal indicating that a signal having a frequency f2 exists as radio wave propagation environment estimation information 1304.
The communication method determination unit 4101 of FIG. 41 inputs the above-mentioned radio wave propagation environment estimation information 1302 and 1304, selects, for example, a communication method having a high transmission speed, and outputs a determination communication method signal 4102. At this time, if the occupied frequency bands of the modulated signals of f1 and f2 are the same, the frequency f1 that transmits signals of multiple channels with multiple antennas has a faster communication speed, so that the frequency f1 is given priority. The communication method will be selected.
Further, when the terminal wants to select a communication method having error tolerance, the communication method having a frequency of f2 is preferentially selected.
In the above, the configurations of the transmitting device and the receiving device are not limited to the configurations of FIGS. 2, 39, 40, 41, and 42. Further, in the frame configuration of FIG. 8, a multiple frame having two antennas and two channels has been described, but the present invention is not limited to this. For example, the transmitting device may transmit a multiple frame having three antennas and three channels. Then, as the communication method, the OFDM method has been described as an example, but the multi-carrier method, the spread spectrum communication method, and the single carrier method can be similarly implemented. For example, a plurality of channels of signals can be transmitted by a plurality of antennas. The communication method for transmission may be the OFDM method, and the communication method for signals that are not multiplexed may be the spectrum diffusion communication method. Further, the spectral diffusion communication method may be used in the method of each carrier of the multi-carrier. Therefore, it is possible to carry out the same in OFDM-CDM.
In addition, one antenna may form one antenna with a plurality of antennas.
As described above, according to the transmitting device and the receiving device of the present embodiment, the communication method of switching between the communication method of transmitting signals of a plurality of channels from a plurality of antennas and the communication method of transmitting signals of one channel is switched depending on the environment. By using the method, the terminal can perform the desired communication by switching the selected communication method depending on whether the terminal gives priority to the transmission speed or the error tolerance. Further, according to the transmitting device and the receiving device of the present embodiment, both the transmission speed and the transmission quality can be achieved by switching the communication method depending on the radio wave propagation environment.
(Embodiment 10) In the tenth embodiment of the present invention, a wireless communication device having a function of receiving information on the number of antennas provided from a communication partner, having a plurality of antennas, and transmitting a plurality of channels is used for information on the number of antennas. A communication method for transmitting a modulated signal of the corresponding number of channels will be described.
FIG. 44 is a diagram showing an example of a frame configuration of a base station according to the tenth embodiment of the present invention. However, for those having the same configuration as that shown in FIG. 1, the same numbers as those shown in FIG. 1 are assigned, and detailed description thereof will be omitted. In FIG. 44, 4401 is a guard symbol and there is no modulation symbol. Then, in FIG. 44, the modulated signals of channels 1 to 3 are transmitted.
FIG. 45 is a diagram showing an example of a frame configuration of a base station according to the tenth embodiment of the present invention. However, for those having the same configuration as that of FIG. 1 or 44, the same number as that of FIG. 1 or 44 is assigned, and detailed description thereof will be omitted. In FIG. 45, 1 to 2 channels of modulated signals are transmitted.
FIG. 46 is a diagram showing an example of the configuration of the transmission device of the base station according to the tenth embodiment of the present invention. In FIG. 46, the modulation signal generation unit 4602 modulates the transmission digital signal 4601 of channel A to form a frame indicated by the frame configuration signal 4619, and transmits a transmission orthogonal baseband signal 4603 having a frame configuration according to the frame configuration signal 4619. Output to radio section 4604.
The radio unit 4604 converts the transmission orthogonal baseband signal 4603 into a radio frequency, and the transmission signal 4605 is output as a radio wave from the antenna 4606.
The modulation signal generation unit 4608 modulates the transmission digital signal 4607 of the channel B, constitutes the frame indicated by the frame configuration signal 4619, and outputs the modulation signal 4609 of the frame configuration corresponding to the frame configuration signal 4619 to the radio unit 4610.
The radio unit 4610 converts the modulated signal 4609 into a radio frequency, and the transmission signal 4611 is output as a radio wave from the antenna 4612.
The modulation signal generation unit 4614 modulates the transmission digital signal 4613 of the channel C, constitutes the frame indicated by the frame configuration signal 4619, and outputs the modulation signal 4615 of the frame configuration corresponding to the frame configuration signal 4619 to the radio unit 4616.
The radio unit 4616 converts the modulated signal 4615 into a radio frequency, and the transmission signal 4617 is output as a radio wave from the antenna 4618.
As a result, the modulated signals of 3 channels are multiplexed and transmitted on the same frequency.
FIG. 47 is a diagram showing an example of the configuration of the receiving device of the base station according to the tenth embodiment of the present invention. However, for those having the same configuration as that in FIG. 39, the same numbers as those in FIG. 39 are assigned, and detailed description thereof will be omitted.
The data separation unit 4701 separates the received digital signal 3906 into the received data, the antenna information, and the radio wave propagation environment estimation information, outputs the received data 4702, and sets the antenna information signal 4703 and the radio wave propagation environment estimation information 4704 as the frame configuration determination unit. Output to 4705.
The frame configuration determination unit 4705 determines the frame configuration from the antenna information signal 4703 and the radio wave propagation environment estimation information 4704, and outputs the frame configuration signal 4706.
FIG. 48 is a diagram showing an example of the configuration of the receiving device of the terminal according to the tenth embodiment of the present invention. In FIG. 48, the radio unit 4803 converts the received signal 4802 received by the antenna 4801 into a baseband frequency, and converts the received orthogonal baseband signal 4804 into a transmission line distortion estimation unit 4805, a transmission line distortion estimation unit 4807, and a transmission line distortion. Output to the estimation unit 4809.
The transmission line distortion estimation unit 4805 outputs the transmission line distortion estimation signal 4806 of channel A from the reception orthogonal baseband signal 4804 to the signal processing unit 4831.
The transmission line distortion estimation unit 4807 outputs the transmission line distortion estimation signal 4808 of channel B from the reception orthogonal baseband signal 4804 to the signal processing unit 4831.
The transmission line distortion estimation unit 4809 outputs the transmission line distortion estimation signal 4810 of channel C from the reception orthogonal baseband signal 4804 to the signal processing unit 4831.
The radio unit 4813 converts the received signal 4812 received by the antenna 4811 into a baseband frequency, and transmits the received orthogonal baseband signal 4814 to the transmission line distortion estimation unit 4815, the transmission line distortion estimation unit 4817, and the transmission line distortion estimation unit 4819. Output.
The transmission line distortion estimation unit 4815 receives the reception orthogonal baseband signal 4814 as an input, and outputs the transmission line distortion estimation signal 4816 of channel A to the signal processing unit 4831.
The transmission line distortion estimation unit 4817 receives the reception orthogonal baseband signal 4814 as an input, and outputs the channel distortion transmission line distortion estimation signal 4818 to the signal processing unit 4831.
The transmission line distortion estimation unit 4819 receives the reception orthogonal baseband signal 4814 as an input, and outputs the channel distortion transmission line distortion estimation signal 4820 to the signal processing unit 4831.
The radio unit 4823 receives the reception signal 4822 received by the antenna 4821 as an input, and outputs the reception orthogonal baseband signal 4824 to the transmission line distortion estimation unit 4825, the transmission line distortion estimation unit 4827, and the transmission line distortion estimation unit 4829.
The transmission line distortion estimation unit 4825 receives the reception orthogonal baseband signal 4824 as an input, and outputs the transmission line distortion estimation signal 4826 of channel A to the signal processing unit 4831.
The transmission line distortion estimation unit 4827 receives the reception orthogonal baseband signal 4824 as an input, and outputs the channel distortion transmission line distortion estimation signal 4828 to the signal processing unit 4831.
The transmission line distortion estimation unit 4829 receives the reception orthogonal baseband signal 4824 as an input, and outputs the channel distortion transmission line distortion estimation signal 4830 to the signal processing unit 4831.
The signal processing unit 4831 includes receive orthogonal baseband signals 4804, 4814, 4824, channel A transmission line distortion estimation signals 4806, 4816, 4826, channel B transmission line distortion estimation signals 4808, 4818, 4828, and channel C transmission line. The distortion estimation signals 4810, 4820, and 4830 are input, inverse matrix calculation is performed, the reception orthogonal baseband signal 4832 of channel A is output to the demodulation unit 4833, and the reception orthogonal baseband signal 4835 of channel B is output to the demodulation unit 4836. Then, the reception orthogonal baseband signal 4838 of channel C is output to the demodulator 4839.
The demodulation unit 4833 demodulates the reception orthogonal baseband signal 4832 of channel A and outputs the reception digital signal 4834.
The demodulation unit 4836 demodulates the reception orthogonal baseband signal 4835 of channel B and outputs the reception digital signal 4837.
The demodulation unit 4839 demodulates the reception orthogonal baseband signal 4838 of channel C and outputs the reception digital signal 4840.
The radio wave propagation environment estimation unit 4841 estimates the radio wave propagation environment from the received orthogonal baseband signals 4804, 4814, and 4824, and outputs the radio wave propagation environment estimation information 4842.
FIG. 49 is a diagram showing an example of the configuration of the transmission device of the terminal according to the tenth embodiment of the present invention. In FIG. 49, the data generation unit 4904 generates a transmission digital signal 4905 from the transmission data 4901, antenna information 4902 which is information on the number of antennas that the terminal has to receive, and radio wave propagation environment estimation information 4903, and modulates the signal. Output to generator 4906.
The modulation signal generation unit 4906 modulates the transmission digital signal 4905 and outputs the transmission orthogonal baseband signal 4907 to the radio unit 4908.
The radio unit 4908 converts the transmission orthogonal baseband signal 4907 into a radio frequency, and the transmission signal 4909 is output as a radio wave from the antenna 4910.
FIG. 50 is a diagram showing an example of a frame configuration of a modulated signal transmitted by the terminal according to the tenth embodiment of the present invention. In FIG. 50, 5001 is an antenna information symbol, 5002 is a radio wave propagation environment symbol, and 5003 is a data symbol.
FIG. 51 is a diagram showing an example of the configuration of the receiving device of the terminal according to the tenth embodiment of the present invention. However, for those having the same configuration as that of FIG. 3 or 29, the same numbers as those of FIG. 3 or 29 are assigned, and detailed description thereof will be omitted.
In FIG. 51, the radio wave propagation environment estimation unit 5101 estimates the radio wave propagation environment from the signals 306 and 316 after the Fourier transform, and outputs the radio wave propagation environment estimation information 5102.
As described above, using FIGS. 44, 45, 46, 47, 48, 49, 50, and 51, information on the number of antennas to be provided is received from the communication partner, and a plurality of antennas are provided. A communication method for transmitting a modulated signal of the number of channels corresponding to the information of the number of antennas of the wireless communication device having a function of transmitting a plurality of channels will be described.
The configuration of a terminal capable of receiving 3 channels will be described.
FIG. 48 shows a terminal receiver capable of demodulating the signals of channels A, B, and C. FIG. 49 shows the transmission device of the terminal, and the data generation unit 4904 has transmission data 4901, three antennas, or antenna information 4902, which is information that a three-channel multiplex signal can be received, and radio wave propagation. The environment estimation information 4903 is input, and the transmission digital signal 4905 according to the frame configuration shown in Fig. 50 is output. At this time, the radio wave propagation environment estimation information 4903 in FIG. 49 corresponds to the radio wave propagation environment estimation information 4842 in FIG. 48.
FIG. 51 shows a terminal receiver capable of demodulating the signals of channels A and B. FIG. 49 shows the transmission device of the terminal, and the data generation unit 4904 has transmission data 4901, two antennas, or antenna information 4902, which is information that a two-channel multiplex signal can be received, and radio wave propagation. The environment estimation information 4903 is input, and the transmission digital signal 4905 according to the frame configuration shown in Fig. 50 is output. At this time, the radio wave propagation environment estimation information 4903 in FIG. 49 corresponds to the radio wave propagation environment estimation information 5102 in FIG. 51.
Next, the configuration of the base station will be described.
FIG. 47 shows a receiving device of a base station. At this time, for example, it is assumed that the channels A, B, and C in FIG. 48 are communicating with a terminal capable of demodulation. The data separation unit 4701 receives the received digital signal as an input, separates the data transmitted from the terminal in the frame configuration shown in FIG. 50, and outputs the received data 4702, the antenna information signal 4703, and the radio wave propagation environment estimation information 4704. At this time, the antenna information signal 4703 is information that the antenna information signal 4703 is provided with three antennas or that a three-channel multiplex signal can be received.
The frame configuration determination unit 4705 receives the antenna information signal 4703 and the radio wave propagation environment estimation information 4704 as inputs, determines the frame configuration based on the antenna information signal 4703 and the radio wave propagation environment estimation information 4704, and outputs the frame configuration signal 4706. .. At this time, FIG. 44 shows a frame configuration based on the antenna information signal 4703, which is provided with three antennas or can receive multiple signals of three channels.
In FIG. 44, when the radio wave propagation environment estimation information 4704 indicates that the radio wave propagation environment is good because the terminal that is the communication partner can receive 3 channels, for example, at times 3, 6, 7, and 10. In this way, signals of 3 channels are multiplexed and transmitted. When the radio wave propagation environment is medium, two channels are multiplexed and transmitted as in time 4 and 5. When the radio wave propagation environment is bad, a 1-channel signal is transmitted, such as time 8 and 9.
The transmission device of the base station of FIG. 46 transmits a modulated signal based on the frame configuration of FIG. 44 included in the frame configuration signal 4619.
Next, a case of communicating with a terminal capable of demodulating channels A and B in FIG. 51 will be described.
In FIG. 47, the data separation unit 4701 of the receiving device of the base station takes the received digital signal as an input, separates the data transmitted from the terminal in the frame configuration of FIG. 50, receives the received data 4702, the antenna information signal 4703, and the radio wave propagation environment. Output the estimation information 4704. At this time, the antenna information signal 4703 is information that two antennas are provided or that a two-channel multiplex signal can be received.
The frame configuration determination unit 4705 receives the antenna information signal 4703 and the radio wave propagation environment estimation information 4704 as inputs, determines the frame configuration based on the antenna information signal 4703 and the radio wave propagation environment estimation information 4704, and outputs the frame configuration signal 4706. .. At this time, FIG. 45 shows a frame configuration based on the antenna information signal 4703, which is provided with two antennas or can receive multiple signals of two channels.
In FIG. 45, when the radio wave propagation environment estimation information 4704 indicates that the radio wave propagation environment is good because the terminal that is the communication partner can receive two channels, for example, time 3, 4, 5, 7, Multiplexing and transmitting signals of 2 channels such as 10. When the radio wave propagation environment is bad, a 1-channel signal is transmitted, such as time 6, 8 and 9.
The transmission device of the base station of FIG. 46 transmits a modulated signal based on the frame configuration of FIG. 45 included in the frame configuration signal 4619.
In the above, the configurations of the transmitting device and the receiving device are not limited to the configurations of FIGS. 46, 47, 48, 49, and 51. In FIG. 46, the configuration is described in which a maximum of 3 channels can be multiplexed with 3 antennas, but the present invention is not limited to this. Then, as the communication method, the OFDM method has been described as an example, but the multi-carrier method, the spread spectrum communication method, and the single carrier method can be similarly implemented. Further, the spectral diffusion communication method may be used in the method of each carrier of the multi-carrier. Therefore, it is possible to carry out the same in OFDM-CDM.
In addition, one antenna may form one antenna with a plurality of antennas.
As described above, according to the transmitting device and the receiving device of the present embodiment, wireless communication having a function of receiving information on the number of antennas provided from the communication partner, having a plurality of antennas, and transmitting a plurality of channels. The device uses a communication method that transmits a modulated signal with the number of channels corresponding to the information on the number of antennas, and by accurately changing the number of multiple channels according to the terminal, the data transmission speed and transmission quality can be improved. It can be compatible.
(Embodiment 11) In the eleventh embodiment of the present invention, in the communication method for transmitting the modulated signals of a plurality of channels from a plurality of antennas, the first channel is used as a pilot channel, and the modulation method of the pilot channel is either one depending on the radio wave propagation environment and the like. A communication method that is changed by the PSK modulation method and the modulation method other than the first channel is changed to one of the modulation methods depending on the radio wave propagation environment will be described.
The first channel is used as a pilot channel in a communication method of transmitting modulated signals of a plurality of channels from a plurality of antennas using FIGS. 2, 18, 26, 28, 47, 49, and 51. The communication method in which the modulation method of the pilot channel is changed by one of the PSK modulation methods depending on the radio wave propagation environment and the like, and the modulation method other than the first channel is changed to either of the modulation methods by the radio wave propagation environment and the like will be described.
The configuration of the receiving device of the terminal is as shown in FIG. 51, and the radio wave propagation environment estimation unit 5101 estimates the radio wave propagation environment from the signals 306 and 316 after the Fourier transform, and outputs the radio wave propagation environment estimation information.
The configuration of the transmitter of the terminal is as shown in Fig. 49, and the data generation unit 4904 inputs the transmission data 4901, the antenna information 4902, and the radio wave propagation environment estimation information 4903, and the transmission digital signal 4905 according to the frame configuration of Fig. 50. Is configured and output. At this time, the radio wave propagation environment estimation information 4903 corresponds to the radio wave propagation environment estimation information 5102 in FIG.
The configuration of the receiving device of the base station is as shown in FIG. 47, and the data separation unit 4701 sends the received digital signal 3906 to the received data 4702, the antenna information signal 4703, and the radio wave propagation environment estimation information 4704 according to the frame configuration of FIG. Separated and output to. The frame configuration determination unit 4705 receives the antenna information signal 4703 and the radio wave propagation environment estimation information 4704 as inputs, and changes the modulation method according to, for example, the radio wave propagation environment estimation information 4704.
At this time, in the frame configurations of FIGS. 18, 26, and 28, when channel A is a pilot channel, the modulation method is changed only for channel B. This is because when demodulating channel B, it is demodulated based on the signal of channel A, so it is better to fix the modulation method of channel A.
Alternatively, the modulation method changed by channel B is not limited, but the modulation method changed by channel A is limited to PSK modulation only. This is because PSK modulation can demodulate channel B because there is no amplitude variation.
In addition, communication control can be performed accurately by transmitting important information for performing communication control by PSK modulation of channel A. For example, for that purpose, only channel A may be PSK-modulated, data may be transmitted by channel B, and the modulation method may be changed in order to achieve both transmission speed and transmission quality.
In the above, the configurations of the transmitting device and the receiving device are not limited to the configurations of FIGS. 2, 47, 49, and 51. Further, in the frame configurations of FIGS. 18, 26, and 28, a multiple frame having two antennas and two channels has been described, but the present invention is not limited to this. For example, the transmitting device may transmit a multiple frame having three antennas and three channels. The OFDM method has been described as an example of the communication method, but the same can be applied to the multi-carrier method, the spread spectrum communication method, and the single carrier method, and the spectrum is used in each of the multi-carrier methods. A spread communication method may be used. Therefore, it is possible to carry out the same in OFDM-CDM.
In addition, one antenna may form one antenna with a plurality of antennas.
As described above, according to the transmitting device and the receiving device of the present embodiment, in the communication method for transmitting the modulated signals of a plurality of channels from the plurality of antennas, the first channel is used as a pilot channel, and the modulation method of the pilot channel is used. Is changed by one of the PSK modulation methods depending on the radio wave propagation environment, etc., and the modulation method other than the first channel is changed to one of the modulation methods by the radio wave propagation environment, etc., and is modulated by the radio wave propagation environment. By changing the method, it is possible to achieve both data transmission speed and transmission quality.
(Embodiment 12) In the twelfth embodiment of the present invention, the communication partner receives the signal based on the method of selecting the antenna to be used for transmission based on the radio wave propagation environment estimation information from the communication partner and the radio wave propagation environment information from the communication partner. This section describes how to determine the antenna to be used for and notify the communication partner.
FIG. 52 is a diagram showing an example of a frame configuration of a transmission signal of the base station according to the twelfth embodiment of the present invention. However, for those having the same configuration as that of FIG. 1 or 44, the same number as that of FIG. 1 or 44 is assigned, and detailed description thereof will be omitted.
FIG. 53 is a diagram showing an example of the configuration of the receiving device of the terminal according to the twelfth embodiment of the present invention. However, for those having the same configuration as that shown in FIG. 48, the same numbers as those shown in FIG. 48 are assigned, and detailed description thereof will be omitted.
The transmission line distortion estimation unit 5301 estimates the transmission line distortion of the transmission signal transmitted from the transmission antenna 1 using the reception orthogonal baseband signal 4804, and estimates the transmission line distortion estimation signal 5302 of the transmission antenna 1 for the radio wave propagation environment. Output to unit 4841.
The transmission line distortion estimation unit 5303 estimates the transmission line distortion of the transmission signal transmitted from the transmission antenna 2 using the reception orthogonal baseband signal 4804, and estimates the transmission line distortion estimation signal 5304 of the transmission antenna 2 for the radio wave propagation environment. Output to unit 4841.
The transmission line distortion estimation unit 5305 estimates the transmission line distortion of the transmission signal transmitted from the transmission antenna 3 using the reception orthogonal baseband signal 4804, and estimates the transmission line distortion estimation signal 5306 of the transmission antenna 3 for the radio wave propagation environment. Output to unit 4841.
The transmission line distortion estimation unit 5307 estimates the transmission line distortion of the transmission signal transmitted from the transmission antenna 1 using the reception orthogonal baseband signal 4814, and estimates the transmission line distortion estimation signal 5308 of the transmission antenna 1 for the radio wave propagation environment. Output to unit 4841.
The transmission line distortion estimation unit 5309 estimates the transmission line distortion of the transmission signal transmitted from the transmission antenna 2 using the reception orthogonal baseband signal 4814, and estimates the transmission line distortion estimation signal 5310 of the transmission antenna 2 for the radio wave propagation environment. Output to unit 4841.
The transmission line distortion estimation unit 5311 estimates the transmission line distortion of the transmission signal transmitted from the transmission antenna 3 using the reception orthogonal baseband signal 4814, and estimates the transmission line distortion estimation signal 5312 of the transmission antenna 3 for the radio wave propagation environment. Output to unit 4841.
The transmission line distortion estimation unit 5313 estimates the transmission line distortion of the transmission signal transmitted from the transmission antenna 1 using the reception orthogonal baseband signal 4824, and estimates the transmission line distortion estimation signal 5314 of the transmission antenna 1 for the radio wave propagation environment. Output to unit 4841.
The transmission line distortion estimation unit 5315 estimates the transmission line distortion of the transmission signal transmitted from the transmission antenna 2 using the reception orthogonal baseband signal 4824, and estimates the transmission line distortion estimation signal 5316 of the transmission antenna 2 in the radio wave propagation environment. Output to unit 4841.
The transmission line distortion estimation unit 5317 estimates the transmission line distortion of the transmission signal transmitted from the transmission antenna 3 using the reception orthogonal baseband signal 4824, and estimates the transmission line distortion estimation signal 5318 of the transmission antenna 3 in the radio wave propagation environment. Output to unit 4841.
The radio wave propagation environment estimation unit 4841 uses the transmission line distortion estimation signals 5302, 5308, 5314 of the transmission antenna 1, the transmission line distortion estimation signals 5304, 5310, 5316 of the transmission antenna 2, and the transmission line distortion estimation signals 5306, 5312 of the transmission antenna 3. , 5318 estimates the radio wave propagation environment and outputs it as radio wave propagation environment estimation information 4842.
The antenna selection unit 5319 receives the reception orthogonal baseband signals 4804, 4814, and 4824 as inputs, selects the input from the antenna used for demodulation, and outputs it as the antenna selection signal 5320.
FIG. 54 is a diagram showing an example of the configuration of the transmission device of the terminal according to the twelfth embodiment of the present invention. However, for those having the same configuration as that shown in FIG. 49, the same numbers as those shown in FIG. 49 are assigned, and detailed description thereof will be omitted.
FIG. 55 is a diagram showing an example of a frame configuration of a modulated signal transmitted by a terminal according to the present embodiment. In FIG. 55, 5501 is a transmission line distortion estimation symbol from the transmitting antenna 1, 5502 is a transmission line distortion estimation symbol from the transmitting antenna 2, 5503 is a transmission line distortion estimation symbol from the transmitting antenna 3, and 5504 is a data symbol.
FIG. 56 is a diagram showing an example of the configuration of the transmission device of the base station according to the embodiment of the present invention. However, for those having the same configuration as that in FIG. 46, the same numbers as those in FIG. 46 are assigned, and detailed description thereof will be omitted. Reference numeral 5602 is antenna information used by the terminal for reception.
The antenna selection unit 5601 outputs the transmission signals 4605 and 4611 as radio waves from any of the antennas 4606, 4612 and 4618 according to the frame configuration indicated by the frame configuration signal 4619.
FIG. 57 is a diagram showing an example of the configuration of the receiving device of the base station according to the twelfth embodiment of the present invention. The antenna used determination unit 5701 receives radio wave propagation environment estimation information 4704 as input, and outputs a frame configuration signal 4706 and antenna information 5702 used by the terminal for reception.
FIG. 58 is a diagram showing an example of the configuration of the transmission device of the base station according to the twelfth embodiment of the present invention. However, for those having the same configuration as that in FIG. 46, the same numbers as those in FIG. 46 are assigned, and detailed description thereof will be omitted.
In FIG. 58, the modulation signal generation unit 5804 inputs the transmission digital signal 5801 of channel A, the transmission digital signal 5802 of channel B, the antenna information 5803 used by the terminal for reception, and the frame configuration information 4619, and the frame configuration information Transmission quadrature baseband signals 4603, 4609, 4615 according to 4619 are generated and output.
As described above, using FIGS. 52, 53, 54, 55, 56, 57, and 58, the method of selecting the antenna to be used for transmission based on the radio wave propagation environment estimation information from the communication partner, and , The method of determining the antenna to be used by the communication partner for reception based on the radio wave propagation environment information from the communication partner and notifying the communication partner will be described.
For example, in the receiving device of the terminal, in order to estimate the radio wave propagation environment, the estimation symbol 103 is used as the base of FIGS. 56 and 58 as shown at times 1, 2, 3 and 11, 12, 13 in FIG. The station's transmitter transmits.
Then, the transmission line distortion estimation unit 5301 of the transmission antenna 1 of the receiving device of the terminal of FIG. 53 receives the reception orthogonal baseband signal 4804 as an input, and the estimation symbols 103 to the estimation symbols 103 of time 1 and 11 to the antenna 1, that is, the antenna of FIG. The transmission line distortion of the signal transmitted from 4606 is estimated, and the transmission line distortion estimation signal 5302 of the transmission antenna 1 is output.
Similarly, the transmission line distortion estimation unit 5307 of the transmission antenna 1 of the receiving device receives the reception orthogonal baseband signal 4814 as an input, and transmits from the estimation symbol 103 of the time 1 and the time 11 to the antenna 1 of FIG. 46, that is, the antenna 4606. The transmission line distortion of the signal is estimated, and the transmission line distortion estimation signal 5308 of the transmitting antenna 1 is output.
Similarly, the transmission line distortion estimation unit 5313 of the transmission antenna 1 of the receiving device receives the reception orthogonal baseband signal 4824 as an input, and transmits from the estimation symbol 103 at time 1 and time 11 to the antenna 1 in FIG. 46, that is, the antenna 4606. The transmission line distortion of the signal is estimated, and the transmission line distortion estimation signal 5314 of the transmission antenna 1 is output.
The transmission path distortion estimation unit 5303 of the transmission antenna 2 of the receiving device receives the reception orthogonal baseband signal 4804 as an input, and receives the signal transmitted from the estimation symbol 103 of the time 2 and 12 to the antenna 2 of FIG. 46, that is, the signal 4612. The transmission line distortion is estimated, and the transmission line distortion estimation signal 5304 of the transmission antenna 2 is output.
Similarly, the transmission line distortion estimation unit 5309 of the transmission antenna 2 of the receiving device receives the reception orthogonal baseband signal 4814 as an input, and is transmitted from the estimation symbol 103 of the time 2 and 12 to the antenna 2 of FIG. 46, that is, the antenna 4612. The transmission line distortion of the signal is estimated, and the transmission line distortion estimation signal 5310 of the transmission antenna 2 is output.
Similarly, the transmission line distortion estimation unit 5315 of the transmission antenna 2 of the receiving device receives the reception orthogonal baseband signal 4814 as an input, and is transmitted from the estimation symbol 103 of the time 2 and 12 to the antenna 2 of FIG. 58, that is, the antenna 4612. The transmission line distortion of the signal is estimated, and the transmission line distortion estimation signal 5316 of the transmission antenna 2 is output.
The transmission path distortion estimation unit 5305 of the transmission antenna 3 of the receiving device receives the reception orthogonal baseband signal 4804 as an input, and receives the signal transmitted from the estimation symbol 103 to the estimation symbol 103 of time 3 and 13 to the antenna 3 of FIG. 58, that is, the signal 4618. The transmission line distortion is estimated, and the transmission line distortion estimation signal 5306 of the transmission antenna 3 is output.
Similarly, the transmission line distortion estimation unit 5311 of the transmission antenna 3 of the receiving device receives the reception orthogonal baseband signal 4814 as an input, and is transmitted from the estimation symbol 103 at time 3 and 13 to the antenna 3 of FIG. 58, that is, the antenna 4618. The transmission line distortion of the signal is estimated, and the transmission line distortion estimation signal 5312 of the transmitting antenna 3 is output.
Similarly, the transmission line distortion estimation unit 5317 of the transmission antenna 3 of the receiving device receives the reception orthogonal baseband signal 4824 as an input, and is transmitted from the estimation symbol 103 at time 3 and 13 to the antenna 3 of FIG. 58, that is, the antenna 4618. The transmission line distortion of the signal is estimated, and the transmission line distortion estimation signal 5318 of the transmission antenna 3 is output.
Then, the radio wave propagation environment estimation unit 4841 uses the transmission line distortion estimation signals 5302, 5308, 5314 of the transmission antenna 1, the transmission line distortion estimation signals 5304, 5310, 5316 of the transmission antenna 2, and the transmission line distortion estimation signal 5306 of the transmission antenna 3. , 5312, 5318 are input and output as radio wave propagation environment estimation information 4842.
FIG. 54 is a transmission device of a terminal, and the data generation unit 4904 inputs transmission data 4901 and radio wave propagation environment estimation information 4903, and outputs a transmission digital signal 4905 according to the frame configuration of FIG. 55. At this time, the radio wave propagation environment estimation information 4903 corresponds to the radio wave propagation environment estimation information 4842 in FIG. 53.
FIG. 57 shows the receiving device of the base station, and the data separation unit 4701 receives the transmission digital signal 4905 according to the frame configuration of FIG. 55 as an input, separates it into data and radio wave propagation environment estimation information, and receives data 4702 and radio waves. The propagation environment estimation information 4704 is output.
The antenna used determination unit 5701 receives radio wave propagation environment estimation information 4704 as input, determines the antenna used by the base station to transmit the modulated signal based on the radio wave propagation environment estimation information 4704, and outputs it as a frame configuration signal 4706. To do. For example, based on the frame configuration as shown in FIG. 52 and the radio wave propagation environment estimation information 4704, the antenna used for reception by the terminal is determined, and the antenna information 5702 used by the terminal for reception is output.
FIG. 58 shows an example of the configuration of the transmission device of the base station, in which the modulation signal generation unit 5804 uses the transmission digital signal 5801 of channel A, the transmission digital signal 5802 of channel B, and the antenna information 5803 used by the terminal for reception. , The frame configuration signal 4619 is input, for example, in FIG. 52, the antenna 1 used by the terminal for reception is transmitted at the antenna 1 at time 4, and the modulated signal is transmitted from the antenna 1 and the antenna 2 at times 5 to 10. Is transmitted, and so on, the transmission orthogonal baseband signals 4603, 4609, and 4615 are output. At this time, the frame configuration signal 4619 corresponds to the frame configuration signal 4706 in FIG. 57, and the antenna information 5803 used by the terminal for reception corresponds to the antenna information 5702 used by the terminal in FIG. 57 for reception.
Further, FIG. 56 has a configuration different from that of FIG. 58 of the transmission device of the base station. In FIG. 56, the antenna selection unit 5601 takes the transmission signals 4605 and 4611 and the frame configuration signal 4619 as inputs, and selects whether to output by the antenna 1, the antenna 2, or the antenna 3 according to the frame configuration of FIG. 52. , Transmission signals 4605 and 4611 are output as radio waves from any of antenna 1, antenna 2, and antenna 3.
In the above, the configurations of the transmitting device and the receiving device are not limited to the configurations of FIGS. 47, 53, 54, 56, and 58. Further, in the frame configuration of FIG. 52, a multiple frame having three antennas and two channels has been described, but the present invention is not limited to this. For example, in the transmitting device, it is possible to carry out the same with multiple frames such as 2 channels with 4 antennas and 3 channels with 4 antennas. The OFDM method has been described as an example of the communication method, but the same can be applied to the multi-carrier method, the spread spectrum communication method, and the single carrier method, and the spectrum is used in each of the multi-carrier methods. A spread communication method may be used. Therefore, it is possible to carry out the same in OFDM-CDM. Then, although the communication between the base station 1 and the terminal 1 has been described as an example, the same can be performed for the base station 1 and the terminal n.
In addition, one antenna may form one antenna with a plurality of antennas.
As described above, according to the transmitting device and the receiving device of the present embodiment, the method of selecting the antenna to be used for transmission based on the radio wave propagation environment estimation information from the communication partner, and the radio wave propagation environment from the communication partner. By determining the antenna to be used by the communication partner for reception based on the information and notifying the communication partner, the data transmission quality is improved by selecting the transmission / reception antenna with the best separation accuracy of multiple signals. To do.
(Embodiment 13) In Embodiment 13 of the present invention, a pilot symbol in a MIMO (Multi-Input Multi-Output) system in which modulation signals of a plurality of channels at the same frequency are transmitted from a plurality of antennas and received and demodulated by the plurality of antennas. The transmission method will be described.
In a MIMO system, when channel state information (CSI) is known not only on the receiving station but also on the transmitting station side, the transmitting station is vectorized using the channel signature vector of transmission. The signal is transmitted from the transmission array antenna to the receiving station, and the receiving station detects the transmission signal from the reception signal of the reception array antenna using the reception channel signature vector associated with the transmission channel signature vector. A communication method for demodulation can be realized.
In particular, as a communication mode in which a plurality of channels are configured in the communication space and signals are multiplex-transmitted, there is an eigen mode using a singular vector or an eigen vector of a channel matrix. This eigenmode is a method of using these eigenvectors and eigenvectors as the channel signature vector described above. Here, the channel matrix is a matrix whose elements are the complex channel coefficients of all or a part of each antenna element of the transmitting array antenna and each antenna element of the receiving array antenna.
As a method for the transmitting station to obtain the channel status information of the downlink, in TDD which uses the same frequency carrier for the uplink and downlink of the wireless line, the uplink from the receiving station is used due to the duality of the channel (reciprocity). It is possible to estimate or measure channel state information at the transmitting station. On the other hand, in FDD that uses different frequency carriers for uplink and downlink, the receiving station estimates or measures the channel state information of the downlink, and the result is reported to the transmitting station, so that the transmitting station notifies the downlink. You can get the exact CSI of.
Unique modes are characterized by maximizing the channel capacity of MIMO systems, especially if the radio channels of the MIMO system can be treated as a narrowband flat fading process. For example, in a wireless communication system that employs OFDM, it is common to insert a guard interval to eliminate intersymbol interference due to multipath delay waves, and design each subcarrier of OFDM to be in a flat fading process. .. Therefore, when transmitting an OFDM signal in a MIMO system, by using a unique mode, for example, it is possible to spatially multiplex and transmit a plurality of signals in each subcarrier.
As a communication method using a MIMO system, there are several methods in which the channel state information of the radio channel is known only in the receiving station, whereas the unique mode in which the downlink channel state information is known in the transmitting station and the receiving station. Proposed. For example, BLAST is known as a method of spatially multiplexing and transmitting signals, which has the same purpose as the eigenmode. Further, as a method of obtaining the so-called spatial diversity effect of the antenna without sacrificing the multiplicity of signals, that is, increasing the capacity, for example, transmission diversity using a spatiotemporal code is known. It is transmitted by vectorizing the signal eigenmode in the transmission array antenna that, in other words the signal whereas a beam space mode is sent after being mapped to the beam space (beam space), and the BLAST and transmission diversity signal It is considered to be in antenna element mode because it maps to the antenna element.
In Embodiment 13 of the present invention, a method of transmitting a demodulation pilot signal when a transmitting station mainly uses a unique mode to transmit a modulated signal to a receiving station in a MIMO system is described. The effect described later can be obtained in the same manner when another method using the mode is used.
FIG. 59 is a diagram showing a configuration example of a channel multiplex communication system using a beam space mode typified by a unique mode in a MIMO system. At the transmitting station, the multiplex frame generation unit 5901 takes the transmission data series as an input and generates a plurality of transmission frames for mapping to the multiplexing channel. Further, the transmission channel analysis unit 5902 calculates channel signature vectors for a plurality of transmissions in order to form a multiplexed channel based on the channel state information which is the estimation result of the propagation channel between the transmitting station and the receiving station. The vector multiplexing unit 5903 multiplies each transmission frame by a different channel signature vector, synthesizes them, and then transmits the transmission array antenna 5904 to the receiving station.
At the receiving station, the receiving channel analysis unit 5911 performs a plurality of receiving channels in order to separate the multiplexed transmission signal based on the channel state information which is the estimation result of the propagation channel between the transmitting station and the receiving station in advance. Calculate the signature vector. The multiplex signal separator 5913 takes the received signal of the receiving array antenna 5912 as an input and generates a plurality of received signal frames obtained by multiplying each channel signature vector. The multi-frame synthesizer 5914 synthesizes the received data series by collecting the signals mapped to the multiplexing channel.
The present invention is suitable for use in wireless communication devices, base station devices, and communication terminal devices.
<figref num="1">The figure which shows an example of the frame structure in the frequency-time axis of each channel in Embodiment 1 of this invention.</figref><figref num="2">Block diagram showing the configuration of the transmitter of this embodiment</figref><figref num="3">Block diagram showing the configuration of the receiving device of this embodiment</figref><figref num="4">The figure which shows an example of the arrangement state of a base station and a terminal in Embodiment 2 of this invention.</figref><figref num="5">A block diagram showing an example of the configuration of the receiving device of the present embodiment.</figref><figref num="6">A block diagram showing an example of the configuration of the transmitter according to this embodiment.</figref><figref num="7">A block diagram showing an example of the configuration of the receiving device of the present embodiment.</figref><figref num="8">The figure which shows the frame structure of the communication signal in Embodiment 3 of this invention.</figref><figref num="9">The figure which shows the frame structure of the communication signal in Embodiment 3 of this invention.</figref><figref num="10">The figure which shows the frequency arrangement of the base station transmission signal in Embodiment 3 of this invention.</figref><figref num="11">A block diagram showing an example of the configuration of a transmission device of a base station according to the present embodiment.</figref><figref num="12">Block diagram showing the configuration of the receiving device of the terminal in this embodiment</figref><figref num="13">The figure which shows an example of the structure of the receiving device of the terminal which concerns on Embodiment 4 of this invention.</figref><figref num="14">The figure which shows an example of the structure of the transmission device of the base station in this embodiment.</figref><figref num="15">The figure which shows an example of the frame composition in the frequency-time axis of channel A and channel B in this embodiment.</figref><figref num="16">The figure which shows an example of the structure of the receiving apparatus which concerns on Embodiment 5 of this invention.</figref><figref num="17">Block diagram showing an example of the configuration of the receiving device of the terminal according to the sixth embodiment of the present invention.</figref><figref num="18">The figure which shows an example of the transmission signal frame structure transmitted by the base station which concerns on Embodiment 7 of this invention.</figref><figref num="19">A block diagram showing an example of the configuration of the transmitter according to the seventh embodiment of the present invention.</figref><figref num="20">A block diagram showing an example of the configuration of the receiving device according to the seventh embodiment of the present invention.</figref><figref num="21">The figure which shows an example of the signal point arrangement on the IQ plane when the signal of channel B is differentially coded with respect to the signal of channel A.</figref><figref num="22">The figure which shows an example of the signal point arrangement on the IQ plane when the signal of channel B is differentially coded with respect to the signal of channel A.</figref><figref num="23">The figure which shows an example when the signal point arrangement on the IQ plane of the multi-value modulation of channel B is performed based on the PSK modulation of channel A.</figref><figref num="24">The figure which shows an example when the signal point arrangement on the IQ plane of the multi-value modulation of channel B is performed based on the PSK modulation of channel A.</figref><figref num="25">The figure which shows an example when the signal point arrangement on the IQ plane of the multi-value modulation of channel B is performed based on the PSK modulation of channel A.</figref><figref num="26">The figure which shows an example of the frame structure of the base station transmission signal of this embodiment.</figref><figref num="27">The figure which shows an example of the signal point arrangement in the IQ plane of the pilot symbol in this embodiment.</figref><figref num="28">The figure which shows an example of the frame structure of the base station transmission signal in this embodiment.</figref><figref num="29">The figure which shows an example of the structure of the receiving device in this embodiment.</figref><figref num="30">Block diagram showing an example of the demodulation unit of this embodiment</figref><figref num="31">Block diagram showing an example of the demodulation unit of this embodiment</figref><figref num="32">Block diagram showing an example of the demodulation unit of this embodiment</figref><figref num="33">Block diagram showing an example of the demodulation unit of this embodiment</figref><figref num="34">Block diagram showing an example of the configuration of the receiving device in this embodiment</figref><figref num="35">Block diagram showing an example of the demodulation unit of this embodiment</figref><figref num="36">A block diagram showing an example of the configuration of the transmitter according to the eighth embodiment of the present invention.</figref><figref num="37">A block diagram showing an example of the configuration of the receiving device according to the eighth embodiment of the present invention.</figref><figref num="38">The figure which shows an example of the arrangement of the base station in Embodiment 9 of this invention.</figref><figref num="39">A block diagram showing a configuration of a receiving device of a base station according to a ninth embodiment of the present invention.</figref><figref num="40">A block diagram showing a configuration of a transmission device of a base station according to a ninth embodiment of the present invention.</figref><figref num="41">The figure which shows an example of the structure of the receiving device of the terminal which concerns on Embodiment 9 of this invention.</figref><figref num="42">The figure which shows an example of the structure of the transmission device of the terminal which concerns on Embodiment 9 of this invention.</figref><figref num="43">The figure which shows an example of the arrangement of the base station in Embodiment 9 of this invention.</figref><figref num="44">The figure which shows an example of the frame structure of the base station which concerns on Embodiment 10 of this invention.</figref><figref num="45">The figure which shows an example of the frame structure of the base station which concerns on Embodiment 10 of this invention.</figref><figref num="46">The figure which shows an example of the structure of the transmission device of the base station which concerns on Embodiment 10 of this invention.</figref><figref num="47">The figure which shows an example of the structure of the receiving device of the base station which concerns on Embodiment 10 of this invention.</figref><figref num="48">The figure which shows an example of the structure of the receiving device of the terminal which concerns on Embodiment 10 of this invention.</figref><figref num="49">The figure which shows an example of the structure of the transmission device of the terminal which concerns on Embodiment 10 of this invention.</figref><figref num="50">The figure which shows an example of the frame structure of the modulation signal transmitted by the terminal which concerns on Embodiment 10 of this invention.</figref><figref num="51">The figure which shows an example of the structure of the receiving device of the terminal which concerns on Embodiment 10 of this invention.</figref><figref num="52">The figure which shows an example of the frame structure of the transmission signal of the base station which concerns on Embodiment 12 of this invention.</figref><figref num="53">The figure which shows an example of the structure of the receiving device of the terminal which concerns on Embodiment 12 of this invention.</figref><figref num="54">The figure which shows an example of the structure of the transmission device of the terminal which concerns on Embodiment 12 of this invention.</figref><figref num="55">The figure which shows an example of the frame structure of the modulation signal transmitted by the terminal in this embodiment.</figref><figref num="56">The figure which shows an example of the structure of the transmission device of the base station which concerns on Embodiment 12 of this invention.</figref><figref num="57">The figure which shows an example of the structure of the receiving device of the base station which concerns on Embodiment 12 of this invention.</figref><figref num="58">The figure which shows an example of the structure of the transmission device of the base station which concerns on Embodiment 12 of this invention.</figref><figref num="59">A diagram showing a configuration example of a channel multiplex communication system using a beam space mode represented by a unique mode in a MIMO system.</figref><figref num="60">Block diagram showing an example of the configuration of a conventional wireless transmitter and receiver</figref>
Code description
202, 212 Serial parallel converter 204, 214 Inverse discrete Fourier transform 221 Frame configuration signal generator 305, 315 Fourier transform part 307, 309, 317, 319 Transmission line distortion estimation unit 321 Signal processing unit 324, 326, 330 Demodulator 328 Selection 332 Frequency offset estimator 334 Sync section 501, 1701, 4841, 5101 Radio propagation environment estimation unit 604 Information generator 707 Method determination unit 1901 Coding section 3004, 3104, 3204 Frequency offset estimator 3006, 3106, 3206 Information symbol demodulation unit 4101 Communication method decision unit 4203 Communication method selection section 4705 Frame configuration decision unit 5601 Antenna selection 5701 Antenna used determination unit 5901 Multiple frame generator 5902 Channel analysis unit 5903 Vector multiplexing section 5904 Transmit array antenna 5911 Channel Analysis Department 5912 Receiving array antenna 5913 Multiple signal separator 5914 Multi-frame synthesizer
Every citation, both ways
| Document | Relation | Office |
|---|---|---|
| JP2005506757A | Cites | Japan |
| JP2003304216A | Cites | Japan |
| JP200136442A | Cites | Japan |
| JP2003283441A | Cites | Japan |
| JP2002374224A | Cites | Japan |
43 members in 7 offices
Priority claims12
| Document | Office | Kind | Date |
|---|---|---|---|
| 2002206799 | Japan | A | |
| 2002206799 | Japan | A | |
| 2002206799 | Japan | – | |
| 2002259791 | Japan | A | |
| 2002259791 | Japan | A | |
| 2002259791 | Japan | – | |
| 2008129725 | Japan | A | |
| 20022002206799 | – | – | – |
| 20022002259791 | – | – | – |
| JP20020206799 | – | – | – |
| JP20020259791 | – | – | – |
| JP20080129725 | – | – | – |
Members43
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| WO2004008671A1 | World Intellectual Property Organization (WIPO) | A1 | |
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| EP1553714A1 | European Patent Office (EPO) | A1 | |
| CN1669257A | China | A | |
| US2005249180A1 | United States of America | A1 | |
| JP2008211842A | Japan | A | |
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| JP4351735B2 | Japan | B2 | |
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| EP1553714A4 | European Patent Office (EPO) | A4 | |
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| US2019199493A1 | United States of America | A1 | |
| EP1553714B1 | European Patent Office (EPO) | B1 | |
| US11018821B2 | United States of America | B2 |
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Numbers
- Publication
- 4491025
- Publication, DOCDB
- 4491025
- Publication, EPODOC
- JP4491025B
- Application
- 129725
- Application, DOCDB
- 2008129725
- Application, EPODOC
- JP20080129725
Titles2
- Japanese
- 受信信号復調方法及び受信信号復調装置
- English
- Received signal demodulation method and received signal demodulator
Classification
- CPC, 18
- H04L5/0048
- H04L27/2602
- H04B7/0417
- H04B7/0613
- H04B7/0837
- H04L5/0007
- H04L25/0204
- H04L25/0224
- H04L27/2647
- H04L27/2657
- H04L27/2662
- H04L5/0044
- H04L27/2627
- H04B7/0404
- H04B14/006
- H04J11/00
- H04B7/0413
- H04W72/0453
- IPC, 7
- H04J99 00
- H04J11 00
- H04B7 06
- H04B7 08
- H04L5 02
- H04L25 02
- H04L27 26