Mobile station, base station, communication system and communication method

The present invention relates to a mobile station, a base station, a communication system, a transmission method, a reception method, a communication method, an IQ multiplexing device, and an IQ multiplexing method that perform high-speed data communication.

As a mobile wireless communication system represented by mobile phones, multiple communication systems called the 3rd generation have been adopted as IMT-2000 by the ITU (International Telecommunication Union), of which the W-CDMA (Wideband Code Division Multiple Access) system In 2001, commercial services were launched in Japan. The W-CDMA system aims to obtain a maximum communication speed of about 2 Mbps (bit per second) per mobile station, and is a version of the standard compiled in 1999 by the standardization organization 3GPP (3rd Generation Partnership Project). The first specification has been decided as the Release 99 (Release 1999) version.

FIG. 21 is a general conceptual diagram showing a conventional communication system. In the figure, 1 is a base station, 2 is a mobile station that performs wireless communication with base station 1, and 3 is data from base station 1 to mobile station 2. Is the downlink used when transmitting data, and 4 is the uplink used when mobile station 2 transmits data to base station 1.

FIG. 22 is a configuration diagram showing the internal configuration of the mobile station 2. In the figure, 11 is a configuration diagram in which the data DPDCH of the individual data channel (Dedicated Physical Data CHannel) is distributed in parallel, and the data DPDCH1 to DPDCH6 of a plurality of data channels The distributor 12 outputs the data DPDCH1 to DPDCH6 output from the distributor 11 and the control data DPCCH of the control channel (Dedicated Physical Control Channel) by multiplying the spread code for channel separation to spread the spectrum. Instrument, 13 is a scramble part that IQ-multiplexes the output signal of the diffuser 12 to generate a complex signal (I signal: Inphase signal, Q signal: Quadrature signal), 14 is a complex signal (I signal) generated by the scramble part 13. , Q signal) is orthogonally modulated to generate a modulated signal, 15 is a frequency converter that frequency-converts the modulated signal generated by the modulator 14 and outputs a radio frequency signal, 16 is from the frequency converter 15. It is an antenna that transmits the output radio frequency signal.

FIG. 23 is a configuration diagram showing the internal configurations of the multiplier 12 and the scramble portion 13. In the figure, 21 to 26 are diffusion codes Cd, 1 for channel separation with respect to the data DPDCH1 to DPDCH6 output from the distributor 11. A multiplier that multiplies ~ Cd, 6, 27 is a multiplier that multiplies the control data DPCCH of the control channel by the spread code Cc for channel separation, and 31 ~ 36 is for the output signal of the multipliers 21 ~ 26. A multiplier for multiplying the amplitude coefficient βd for DPDCH, 37 is a multiplier for multiplying the output signal of the multiplier 27 by the amplitude coefficient βc for DPCCH. 38 is an adder that adds the output signals of multipliers 31 to 33, 39 is an adder that adds the output signals of multipliers 34 to 37, and 40 is an adder that multiplies the output signal of multiplier 39 by an imaginary number j. , 41 is an adder that adds the output signal of adder 38 and the output signal of multiplier 40, and 42 is a complex signal by multiplying the output signal of adder 41 by the identification code Sdpch, n for mobile station identification. It is a multiplier that outputs (I signal, Q signal).

Next, the operation will be described. The operation when the mobile station 2 transmits data to the base station 1 will be described. When mobile station 2 transmits data to base station 1, as shown in FIG. 21, data is transmitted using uplink 4, but in the W-CDMA standard, one mobile station 2 transmits data to uplink 4. When using, data of up to 6 data channels can be transmitted according to the communication speed required for the communication service. Here, for convenience of explanation, a case where data of six data channels and control data of one control channel are transmitted will be described.

First, the distributor 11 of the mobile station 2 distributes the data DPDCH of the individual data channels in parallel, and outputs the data DPDCH1 to DPDCH6 of the plurality of data channels. In the multipliers 21 to 26 of the spreader 12, when the distributor 11 outputs the data DPDCH1 to DPDCH6 of a plurality of data channels, the spreading codes Cd, 1 to Cd, 6 for channel separation are obtained for the data DPDCH1 to DPDCH6. Is multiplied, and the multiplier 27 of the spreader 12 multiplies the control data DPCCH of the control channel by the spread code Cc for channel separation.

The scramble unit 13 IQ-multiplexes the output signal of the diffuser 12 to generate a complex signal (I signal, Q signal). That is, the multipliers 31 to 36 of the scramble unit 13 multiply the output signals of the multipliers 21 to 26 in the spreader 12 by the amplitude coefficient βd for DPDCH, and the multiplier 37 of the scramble unit 13 is the multiplier 12 The output signal of the multiplier 27 in is multiplied by the amplitude coefficient βc for DPCCH. Here, FIG. 24 is a table diagram showing possible values of the amplitude coefficients βd and βc. The amplitude coefficients βd and βc are coefficients for determining the power ratio between the data DPDCH1 to DPDCH6 and the control data DPCCH, and are specified in TS25.213v3.6.0 (2001-06) (Release 1999) of the 3GPP standard. The right side of the table is the value that the amplitude coefficients βd and βc can take.

Then, the adder 38 of the scramble unit 13 adds the output signals of the multipliers 31 to 33, and the adder 39 of the scramble unit 13 adds the output signals of the multipliers 34 to 37. Further, since the multiplier 40 of the scramble unit 13 allocates the output signal of the adder 39 to the Q axis, the output signal of the adder 39 is multiplied by the imaginary number j. Here, the data DPDCH1, DPDCH3, and DPDCH5 are assigned to the I axis, and the data DPDCH2, DPDCH4, and DPDCH6 are assigned to the Q axis, but the method of assigning the data channel to the I / Q axis is TS25.213 of the 3GPP standard. It is stipulated in.

Next, the adder 41 of the scramble unit 13 adds the output signal of the adder 38 and the output signal of the multiplier 40, and the multiplier 42 of the scramble unit 13 identifies the mobile station with respect to the output signal of the adder 41. Outputs a complex signal (I signal, Q signal) by multiplying the identification code Sdpch, n for. When the scramble unit 13 generates a complex signal (I signal, Q signal) as described above, the modulation unit 14 orthogonally modulates the complex signal (I signal, Q signal) to generate a modulated signal. When the modulation unit 14 generates a modulation signal, the frequency conversion unit 15 frequency-converts the modulation signal to generate a radio frequency signal, amplifies the radio frequency signal, and outputs the signal to the antenna 16. As a result, the radio frequency signal is transmitted from the antenna 16 to the base station 1.

When the base station 1 receives the radio frequency signal transmitted from the mobile station 2, the base station 1 acquires data by performing an operation opposite to that of the mobile station 2. In the above conventional example, 6 data channels are set, but when the number of data channels set is 5 or less, data DPDCH1 is assigned to the I / Q axis in order, and unnecessary data is used. No processing is done on the channel. The number of data channel settings is determined by the required communication service and communication speed.

Here, FIG. 25 is an explanatory diagram showing a complex plane when the number of data channel settings is 1. In this case, the data DPDCH1 of the data channel is assigned to the I axis, and the control data DPCCH of the control channel is assigned to the Q axis. As a result, the data DPDCH1 and the control data DPCCH are orthogonal to each other, so that the base station 1 can separate and demodulate both channels. The same can be shown for the case where the number of data channels set is 2 to 6. However, when the number of data channels set is 2 to 6, channel components on the same axis can be separated by using a diffusion code for channel separation.

In the above conventional example, one downlink link 3 and one uplink link 4 are set between the base station 1 and the mobile station 2, but the downlink data transmitted by the base station 1 to the mobile station 2 is shown. As shown in Fig. 26, HSDPA (High Speed Downlink Packet Access), which newly adds downlink 5 in addition to the conventional downlink 3, has been proposed and examined (TR25. 858v1.0.0 (2001-12) See High Speed Downlink Packet Access: Physical Layer Aspects (Release 5)).

When a new downlink 5 is added, it is considered that the mobile station 2 transmits response data (ACK / NACK) or the like to the downlink high-speed packet data to the base station 1. As shown in FIG. 26. In addition, the dedicated control channel (uplink channel 6) for transmitting the response data is separated and identified by the diffusion code for channel separation in the same manner as the conventional control channel, and then the conventional uplink 4 It is being considered in the direction of additional multiplexing. In TR25.858, the dedicated control channel is described as additional DPCCH.<patcit num="1"><text>Japanese Unexamined Patent Publication No. 10-341188</text></patcit><patcit num="2"><text>Japanese Unexamined Patent Publication No. 2001-267959</text></patcit><patcit num="3"><text>Japanese Unexamined Patent Publication No. 2002-369258</text></patcit>

<p>Since the conventional communication system is configured as described above, it is necessary to assign a newly added dedicated control channel to the I-axis or Q-axis, but assign a dedicated control channel to the I-axis or Q-axis. As a result, when the peak power of the I-axis or Q-axis increases, for example, in the quadrature modulator (or quadrature modulation amplifier) built in the modulation unit 14 of the mobile station 2, the non-linear region of the input / output characteristics is used. Therefore, distortion occurs. Further, when the I-axis signal power and the Q-axis signal power are out of balance, the peak power of the modulated signal after orthogonal modulation output from the modulation unit 14 may be balanced between the I-axis and the Q-axis. For example, when amplifying a radio frequency signal using an amplifier built in the frequency converter 15 of the mobile station 2, distortion is caused because a non-linear region of the input / output characteristics of the amplifier is used. Occur. When distortion occurs in the amplifier and a non-linear component is output in this way, there is a problem that the non-linear component interferes with the signal component of the adjacent frequency band and interferes with the adjacent frequency band.</p><p>The present invention has been made to solve the above-mentioned problems, and is a mobile station, a base station, a communication system, and a transmission capable of suppressing the occurrence of distortion of an amplifier and suppressing interference to an adjacent frequency band. The purpose is to obtain a method, a receiving method, a communication method, an IQ multiplexing device, and an IQ multiplexing method.</p>

<p>The present invention<u style="single">Corresponds to the base station</u>The mobile station has an IQ multiplexing means that IQ-multiplexes the transmission data of the data channel and the control data of the control channel to generate a complex signal, and a transmission means that modulates and transmits the complex signal generated by the IQ multiplexing means. The IQ multiplexing means alternately allocates the transmission data of the data channel to the I-axis and the Q-axis.<u style="single">If the number of data channel settings is odd, it will be on the Q axis. If it is even, it will be on the I axis.</u>A complex signal is generated by allocating and IQ multiplexing.</p>

<p>According to the present invention, there is an effect that the occurrence of distortion of the amplifier can be suppressed and the interference with the adjacent frequency band can be suppressed.</p>

Embodiment 1. FIG. 1 is a configuration diagram showing a mobile station applied to the communication system according to the first embodiment of the present invention. In the figure, 51 is a data DPDCH of an individual data channel distributed in parallel. A distributor that outputs data DPDCH1 to DPDCH6 of multiple data channels, 52 is for channel separation for data DPDCH1 to DPDCH6 output from distributor 51 and control data DPCCH, ADPCCH (ADPCCH: additional DPCCH) of control channels. The spreader that divides the spectrum by multiplying the spreading code of, 53 is the distributor that distributes the control data ADPCCH of the control channel after the spectrum is spread by the spreader 52, and 54 is the output signal of the spreader 52 and the distributor 53. It is a scramble part that generates complex signals (I signal, Q signal) by IQ multiplexing. The IQ multiplexing means is composed of the distributor 51, the diffuser 52, the distributor 53, and the scramble unit 54.

55 is a modulation unit that orthogonally modulates the complex signal (I signal, Q signal) generated by the scramble unit 54 to generate a modulation signal, and 56 is a radio frequency signal that frequency-converts the modulation signal generated by the modulation unit 55. The frequency conversion unit 57 that outputs the above is an antenna that transmits the radio frequency signal output from the frequency conversion unit 56. The transmission means is composed of the modulation unit 55, the frequency conversion unit 56, and the antenna 57.

FIG. 2 is a configuration diagram showing a base station applied to the communication system according to the first embodiment of the present invention. In the figure, 61 is an antenna for receiving a radio frequency signal transmitted from mobile station 2, and 62 is an antenna 61. The frequency conversion unit that outputs the baseband signal by frequency-converting the radio frequency signal received by 63, 63 is the orthogonal demodulation of the baseband signal output from the frequency conversion unit 62, and produces a complex signal (I signal, Q signal). It is an orthogonal demodulator that outputs. The receiving means is composed of the antenna 61, the frequency conversion unit 62, and the orthogonal demodulation unit 63.

64 is an inverse scramble unit that multiplies the complex signal (I signal, Q signal) output from the orthogonal demodulator 63 by an identification code for mobile station identification, and 65 is a channel separation for the output signal of the inverse scramble unit 64. A despreader that separates the data of each channel by multiplying the data DPDCH for each channel, 66 is a data channel coalescing part that coalesces the data DPDCH1 to DPDCH6 of the data channel and reproduces the data DPDCH of the individual data channel. 67 is a synthesizer that synthesizes the control data ADPCCH of the control channels distributed on the I and Q axes. The IQ separation means is composed of the reverse scramble part 64, the reverse diffuser 65, the data channel uniting part 66, and the synthesizer 67.

FIG. 3 is a configuration diagram showing the internal configurations of the spreader 52, the distributor 53, and the scrambled portion 54. In the figure, 71 to 76 are spreads for channel separation with respect to the data DPDCH1 to DPDCH6 output from the distributor 51. A multiplier that multiplies the codes Cd, 1 to Cd, 6, 77 is a multiplier that multiplies the control data DPCCH of the control channel by the diffusion code Cc for channel separation, and 78 is the control of the newly added control channel. A multiplier that multiplies the data ADPCCH by the spread code Ccc for channel separation, 81 to 86 are multipliers that multiply the output signals of multipliers 71 to 76 by the amplitude coefficient βd for DPDCH, and 87 is a multiplier 77. The output signal of is multiplied by the amplitude coefficient βc for DPCCH, and 88 and 89 are multipliers for multiplying the output signal of the distributor 53 by the amplitude coefficient βcc for ADPCCH.

90 is an adder that adds the output signals of multipliers 81 to 83,88, 91 is an adder that adds the output signals of multipliers 84 to 87,89, and 92 is an imaginary number j for the output signal of multiplier 91. Multiplier, 93 is an adder that adds the output signal of adder 90 and the output signal of adder 92, 94 is the output signal of adder 93 multiplied by the identification code Sdpch, n for mobile station identification. It is a multiplier that outputs complex signals (I signal, Q signal).

FIG. 4 is a configuration diagram showing the internal configurations of the reverse scramble section 64, the reverse spreader 65, and the combiner 67. In the figure, 100 is for the complex signal (I signal, Q signal) output from the orthogonal demodulation section 63. A multiplier that multiplies the identification code Sdpch, n for mobile station identification, 101 to 104 are diffusion codes Cd, 1, Cd, 3, Cd, for channel separation for the I signal output from the inverse scramble unit 64. Multipliers that multiply 5, Ccc respectively, 105 to 109 are the diffusion codes Cd, 2, Cd, 4, Cd, 6, Cc, Ccc for channel separation for the Q signal output from the inverse scramble part 64, respectively. The multipliers for multiplying, 110 to 118, are integrators that time-integrate the output signals of the multipliers 101 to 109 over the spread code time length. Note that FIG. 5 is a flowchart showing a communication method according to the first embodiment of the present invention.

Next, the operation will be described. The operation when the mobile station 2 transmits data to the base station 1 will be described. Here, for convenience of explanation, a case where the data of the six data channels and the control data of the two control channels are transmitted will be described. First, the distributor 51 of the mobile station 2 distributes the data DPDCH of the individual data channels in parallel, and outputs the data DPDCH1 to DPDCH6 of the plurality of data channels (step ST1).

When the distributor 51 outputs the data DPDCH1 to DPDCH6 of a plurality of data channels, the spreader 52 spreads the data DPDCH1 to DPDCH6 of the data channel and the control data DPCCH, ADPCCH of the control channel for channel separation. Multiply the sign to spread the spectrum (step ST2). That is, the multipliers 71 to 76 of the spreader 52 multiply the data DPDCH1 to DPDCH6 of the plurality of data channels output from the distributor 51 by the spread codes Cd, 1 to Cd, 6 for channel separation. The multiplier 77 of the spreader 52 multiplies the control data DPCCH of the control channel by the spread code Cc for channel separation, and the multiplier 78 of the spreader 52 is the control data ADPCCH of the newly added control channel. Is multiplied by the spread code Ccc for channel separation.

In the distributor 53, when the multiplier 78 of the spreader 52 multiplies the control data ADPCCH of the control channel by the spread code Ccc for channel separation, the output data of the multiplier 78 is multiplied by the multiplier 88,89 of the scramble part 54. Distribute to (step ST3). The distribution ratio of the scrambled portion 54 to the multipliers 88 and 89 may be determined in consideration of the signal power of the I-axis and the signal power of the Q-axis, but in this example, the distribution ratio is 1: 1. Shall.

The scramble unit 54 IQ-multiplexes the output signals of the diffuser 52 and the distributor 53 to generate a complex signal (I signal, Q signal) (step ST4). That is, the multipliers 81 to 86 of the scramble part 54 multiply the output signals of the multipliers 71 to 76 in the spreader 52 by the amplitude coefficient βd for DPDCH, and the multiplier 87 of the scramble part 54 is the multiplier 52. The output signal of the multiplier 77 in is multiplied by the amplitude coefficient βc for DPCCH. Further, the multiplier 88 of the scramble unit 54 multiplies the output signal of the distributor 53 by the amplitude coefficient βcc (I) for ADPCCH, and the multiplier 89 of the scramble unit 54 increases the output signal of the distributor 53. And multiply by the amplitude coefficient βcc (Q) for ADPCCH.

The amplitude coefficients βcc (I) and βcc (Q) for ADPCCH are determined in consideration of the signal power of the I-axis and the signal power of the Q-axis. That is, it is determined so that the signal power of the I signal output from the adder 93 and the signal power of the Q signal are uniform. Incidentally, FIG. 6 shows a complex plane when the number of data channel settings is 1, but for example, if the signal power of the data DPDCH1 is 1.5 and the signal power of the control data DPCCH is 1.0, I The amplitude coefficients βcc (I), βcc (Q) for ADPCCH so that the signal power of the axis control data ADPCCH (I) is 1.0 and the signal power of the Q-axis control data ADPCCH (Q) is 0.5. ) Is determined.

Next, the adder 90 of the scramble unit 54 adds the output signals of the multipliers 81 to 83,88, and the adder 91 of the scramble unit 54 adds the output signals of the multipliers 84 to 87,89. Further, since the multiplier 92 of the scramble unit 54 allocates the output signal of the adder 91 to the Q axis, the output signal of the adder 91 is multiplied by the imaginary number j. Next, the adder 93 of the scramble unit 54 adds the output signal of the adder 90 and the output signal of the multiplier 92, and the multiplier 94 of the scramble unit 54 identifies the mobile station with respect to the output signal of the adder 93. Outputs a complex signal (I signal, Q signal) by multiplying the identification code Sdpch, n for.

When the scramble unit 54 generates a complex signal (I signal, Q signal) as described above, the modulation unit 55 orthogonally modulates the complex signal (I signal, Q signal) to generate a modulated signal (step ST5). ). When the modulation unit 55 generates a modulation signal, the frequency conversion unit 56 frequency-converts the modulation signal to generate a radio frequency signal, amplifies the radio frequency signal, and outputs the signal to the antenna 57 (step ST6). As a result, the radio frequency signal is transmitted from the antenna 57 to the base station 1.

When the antenna 61 receives the radio frequency signal transmitted from the mobile station 2, the frequency conversion unit 62 of the base station 1 frequency-converts the radio frequency signal and outputs the baseband signal (step ST7). When the frequency conversion unit 62 outputs the baseband signal, the orthogonal demodulation unit 63 orthogonally demodulates the baseband signal and outputs a complex signal (I signal, Q signal) (step ST8).

When the orthogonal demodulation unit 63 outputs a complex signal (I signal, Q signal), the inverse scramble unit 64 multiplies the complex signal (I signal, Q signal) by an identification code for mobile station identification (step ST9). ). That is, the multiplier 100 of the inverse scramble unit 64 multiplies the complex signals (I signal, Q signal) output from the orthogonal demodulation unit 63 by the identification codes Sdpch, n for mobile station identification.

The despreader 65 multiplies the output signal of the descrambling unit 64 by the spread code for channel separation to separate the data of each channel (step ST10). That is, the multipliers 101 to 104 of the reverse spreader 65 multiply the I signal output from the reverse scrambler 64 by the spread codes Cd, 1, Cd, 3, Cd, 5, and Ccc for channel separation, respectively. , The multipliers 105 to 109 of the reverse spreader 65 multiply the Q signal output from the reverse scrambler 64 by the spread codes Cd, 2, Cd, 4, Cd, 6, Cc, and Ccc for channel separation, respectively. To do. Then, the integrators 110 to 118 of the despreader 65 control the data DPDCH1 to DPDCH6 of the data channel and the control channel by integrating the output signals of the multipliers 101 to 109 over the diffusion code time length. Reproduce the data DPCCH.

The data DPDCH1 to DPDCH6 of the data channel are combined by the data channel uniting unit 66, and the data DPDCH of the individual data channel is reproduced (step ST11). In addition, the output signal of the integrator 113 of the reverse diffuser 65 and the output signal of the integrator 118 are combined by the synthesizer 67, and the control data ADPCCH of the newly added control channel is reproduced (step ST12). ..

As is clear from the above, according to the first embodiment, when the scramble unit 54 IQ-multiplexes the output signals of the diffuser 52 and the distributor 53 to generate a complex signal (I signal, Q signal), I Since the amplitude coefficients βcc (I) and βcc (Q) for ADPCCH are determined in consideration of the signal power of the axis and the signal power of the Q axis, for example, the distortion of the amplifier in the frequency converter 56 is generated. It has the effect of suppressing interference with adjacent frequency bands.

In the first embodiment, six data channels are set, but when the number of data channels set is 5 or less, the data DPDCH1 is assigned to the I / Q axis in order, which is unnecessary. No processing is performed on various data channels. The number of data channel settings is determined by the required communication service and communication speed.

Embodiment 2. FIG. 7 is a configuration diagram showing a mobile station applied to the communication system according to the second embodiment of the present invention, and FIG. 8 is a base station applied to the communication system according to the second embodiment of the present invention. It is a block diagram which shows. In the figure, the same reference numerals as those in FIGS. 1 and 2 indicate the same or corresponding parts, and thus description thereof will be omitted. 58 is a selector (IQ multiplexing means) that outputs the control data ADPCCH of the control channel after the spectrum is diffused by the diffuser 52 to the multiplier 88 or the multiplier 89 of the scramble unit 54, and 68 is the integrator 113 of the despreader 65 or It is a selector (IQ separation means) that inputs and outputs the control data ADPCCH of the control channel from the integrator 118.

In the first embodiment, the distributor 53 distributes the output data of the multiplier 78 in the spreader 52 to the multipliers 88 and 89 of the scrambled portion 54, and the multipliers 88 and 89 of the scrambled portion 54 distribute the signal power of the I signal. The one that multiplies the output signal of the distributor 53 by the amplitude coefficients βcc (I) and βcc (Q) for ADPCCH so that the signal power of the Q signal becomes uniform is shown. Since the control channel control data ADPCCH is assigned to the axis with the smaller signal power, the selector 58 scrambles the output data of the multiplier 78 in the diffuser 52, taking into account the signal power of the I axis and the signal power of the Q axis. The output may be made to the multiplier 88 or the multiplier 89 of the part 54.

That is, in the 3GPP standard TS25.213, if the number of data channels set is 1, the data channel is assigned to the I axis (see Fig. 9), and if the number of data channels set is 2. , Each data channel is assigned to the I-axis and Q-axis (see Fig. 10), and it is specified that the data channel is assigned to the I-axis and Q-axis alternately. Therefore, in the second embodiment, from the viewpoint of balancing the signal power of the I-axis and the signal power of the Q-axis, the selector 58 of the mobile station 2 is a diffuser if the number of data channel settings is odd. The output data of the multiplier 78 in 52 is output to the multiplier 89 of the scramble unit 54, and the control data ADPCCH of the control channel is assigned to the Q axis.

The selector 68 of the base station 1 inputs the control data ADPCCH of the control channel from the integrator 118 of the despreader 65 in order to obtain the control data ADPCCH of the control channel assigned to the Q axis, and the control data thereof. Output ADPCCH. On the other hand, if the number of data channel settings is even, the selector 58 of the mobile station 2 outputs the output data of the multiplier 78 in the spreader 52 to the multiplier 88 of the scramble unit 54 to control the control channel. Assign data ADPCCH to the I axis.

The selector 68 of the base station 1 inputs the control data ADPCCH of the control channel from the integrator 113 of the despreader 65 in order to obtain the control data ADPCCH of the control channel assigned to the I axis, and the control data thereof. Output ADPCCH. As a result, according to the second embodiment, for example, it is possible to suppress the generation of distortion of the amplifier in the frequency conversion unit 56 and suppress the interference to the adjacent frequency band, as in the first embodiment. It works.

In the second embodiment, the axis for allocating the control data ADPCCH of the control channel is determined according to the number of data channel settings, but the selector 58 of the mobile station 2 is the signal power of the I axis. The signal power of the Q-axis may be measured to determine the axis to which the control data ADPCCH of the control channel is assigned.

Embodiment 3. In the second embodiment, the control data ADPCCH of the control channel is assigned to the axis having the smaller signal power among the I-axis and the Q-axis, which are shown in FIGS. 13 and 14. As described above, the control data ADPCCH of the control channel may always be assigned to the Q axis. That is, the spread code length of the control data ADPCCH of the control channel is about 256, which is considered to be about the same as the spread code length of the control data DPCCH of the control channel.

Therefore, the signal power of the control data ADPCCH of the control channel is smaller than the signal power of the data DPDCH1 of the data channel, and when considering the use of the Internet, for example, the signal power is compared with the amount of data transmitted on the downlink. Since it is considered that the amount of data transmitted by the uplink is not large, it is conceivable that the number of data channels set is 1 in many cases where the HSDPA link is set.

Here, FIGS. 15 to 20 show the scramble section 54 when the control data ADPCCH of the control channel is assigned to the I-axis or the Q-axis by changing the set number of data channels (indicated by N in the figure). A simulation example of CCDF (Complimentary Cumulative Distribution Function) characteristics in the output waveform of is shown. In the figure, "I" shows the characteristics when the control data ADPCCH is assigned to the I axis, and "Q" shows the characteristics when the control data ADPCCH is assigned to the Q axis.

The CCDF characteristic indicates the ratio (%) of how much the instantaneous power exceeds the average power in time. As the CCDF characteristics move to the right, it means that the ratio of instantaneous power that is larger than the average power is large (power fluctuation is large). For example, when the number of data channel settings is 1 (N = 1) and the characteristics of the control channel control data ADPCCH assigned to the Q axis are seen, the time ratio at which the instantaneous power is about 3.5 dB or more higher than the average power. Is 0.1%. As an amplifier, the more a signal with a large fluctuation is input, the more easily distortion is generated, and the linearity is required up to a larger power in order to suppress the distortion, so that the current consumption increases.

As can be seen from Fig. 15, when N = 1 (data channel is DPDCH1 only), the characteristics differ greatly depending on whether the allocation axis of the control data ADPCCH is I or Q, and distortion occurs when assigned to the Q axis. Few. Similarly, the allocation axes with good characteristics are switched according to N, and it can be seen that the CCDF characteristics are better when N is an odd number and is assigned to the Q axis, and when N is even, it is assigned to the I axis. .. This is consistent with the allocation method in the second embodiment, and it can be seen that this is the best method that can reduce distortion from the viewpoint of CCDF characteristics. However, when N&gt; 1, the difference between the I-axis and the Q-axis is not large as compared with the case of N = 1, so it can be considered that the degree of distortion is also small. Therefore, from the viewpoint of balancing the signal power of the I-axis and the signal power of the Q-axis and the characteristics of the input signal of the amplifier, the control data ADPCCH of the control channel is combined with the control data DPCCH of the control channel. Is not likely to cause any problems in practice even if is assigned to the Q axis.

In this way, when the control data ADPCCH of the control channel is always assigned to the Q axis, as shown in FIGS. 11 and 12, the distributor 53, the synthesizer 67, or the selectors 58 and 68 are not required, and the circuit configuration It has the effect of simplifying.

<figref num="1">It is a block diagram which shows the mobile station applied to the communication system by Embodiment 1 of this invention.</figref><figref num="2">It is a block diagram which shows the base station applied to the communication system by Embodiment 1 of this invention.</figref><figref num="3">It is a block diagram which shows the internal structure of a diffuser, a distributor and a scramble part.</figref><figref num="4">It is a block diagram which shows the internal structure of the reverse scramble part, the reverse diffuser, and a synthesizer.</figref><figref num="5">It is a flowchart which shows the communication method by Embodiment 1 of this invention.</figref><figref num="6">It is explanatory drawing which shows the complex plane when the number of setting of a data channel is 1.</figref><figref num="7">It is a block diagram which shows the mobile station applied to the communication system by Embodiment 2 of this invention.</figref><figref num="8">It is a block diagram which shows the base station applied to the communication system by Embodiment 2 of this invention.</figref><figref num="9">It is explanatory drawing which shows the complex plane when the number of setting of a data channel is 1.</figref><figref num="10">It is explanatory drawing which shows the complex plane when the number of setting of a data channel is 2.</figref><figref num="11">It is a block diagram which shows the mobile station applied to the communication system by Embodiment 3 of this invention.</figref><figref num="12">It is a block diagram which shows the base station applied to the communication system by Embodiment 3 of this invention.</figref><figref num="13">It is explanatory drawing which shows the complex plane when the number of setting of a data channel is 1.</figref><figref num="14">It is explanatory drawing which shows the complex plane when the number of setting of a data channel is 2.</figref><figref num="15">It is explanatory drawing which shows the CCDF characteristic of a modulation waveform.</figref><figref num="16">It is explanatory drawing which shows the CCDF characteristic of a modulation waveform.</figref><figref num="17">It is explanatory drawing which shows the CCDF characteristic of a modulation waveform.</figref><figref num="18">It is explanatory drawing which shows the CCDF characteristic of a modulation waveform.</figref><figref num="19">It is explanatory drawing which shows the CCDF characteristic of a modulation waveform.</figref><figref num="20">It is explanatory drawing which shows the CCDF characteristic of a modulation waveform.</figref><figref num="21">It is a conceptual diagram which shows the conventional communication system.</figref><figref num="22">It is a block diagram which shows the internal structure of a mobile station.</figref><figref num="23">It is a block diagram which shows the internal structure of a diffuser and a scramble part.</figref><figref num="24">It is a table figure which shows the value which the amplitude coefficient βd, βc can take.</figref><figref num="25">It is explanatory drawing which shows the complex plane when the number of setting of a data channel is 1.</figref><figref num="26">It is a conceptual diagram which shows the conventional communication system.</figref>

Code description

51 Distributor (IQ Multiplier Means), 52 Disperser (IQ Multiplier Means), 53 Distributor (IQ Multiplier Means), 54 Scrambler (IQ Multiplier Means), 55 Modulator (Transmitting Means), 56 Frequency Converter (Transfer Means), 57 antennas (transmitting means), 58 selectors (IQ multiplier means), 61 antennas (receiving means), 62 frequency converters (receiving means), 63 orthogonal demodulators (receiving means), 64 inverse scrambles (IQ separation) Means), 65 Despreader (IQ Separation Means), 66 Channel Merger for Data (IQ Separation Means), 67 Combiner (IQ Separation Means), 68 Selector (IQ Separation Means), 71-76 Multipliers, 77 Multipliers Instrument, 78 multiplier, 81 ~ 86 multiplier, 87 multiplier, 88,89 multiplier, 90 multiplier, 91 multiplier, 92 multiplier, 93 multiplier, 94 multiplier, 100 multiplier, 101 ~ 104 multiplier Instrument, 105-109 multiplier, 110-118 integrator.