Apparatus for wireless telecommunication using frequency hop

Apparatus for Wireless Telecommunication using Frequency Hop

The present invention relates to a wireless transceiver capable of simultaneous two-channel operation, and more particularly, the present invention relates to a radio that joins different networks and operates two channels at the same time to match the hopping synchronization between different communication networks and set the hopping parameters. It relates to a technology for preventing cosight between channels that occurs during frequency hopping communication by sharing.

In general, the frequency hopping method refers to a communication method in which a transmitting/receiving side transmits and receives a data frame while changing the same frequency at a predetermined time interval. Spread Spectrum) modulation method.

The direct sequence method is based on a digital code sequence (pseudo-noise sequence).

In contrast to modulating a carrier wave, in the frequency hopping method, the carrier frequency is discontinuously shifted in a pattern determined by a code sequence.

In such a frequency hopping (FH) method, a given bandwidth is divided into a large number of hopping channels, and when the transmitting side converts a primary modulated signal (intermediate frequency) into an RF frequency band, different hopping is performed according to a predetermined order. Allocated to a channel, and the receiving end restores the original signal by connecting the received signals distributed in several hop channels in the same order as the transmitting side.

More specifically, for such frequency hopping communication, a hopping frequency set S consisting of n frequencies selected using a hopping frequency set (SET) generation algorithm in a frequency resource divided by the transmission bandwidth in the same waveform operating band at the transmitting and receiving side_It'smust be charged, and the transmitting and receiving sides must coincide with the x-th same fx frequency at the same time. In addition, a hopping frequency f selected at intervals of d (Hop. hops) during transmission and reception_x is the hopping frequency set S_It'sThe following frequency set S in real time by the hopping frequency selection algorithm using , PN code, time information, etc._It'sis selected from

S_It's = { f₁, f₂, . f_n_-1, f_n}

Such frequency hopping communication is less likely to be detected than fixed frequency communication through diversification of the hopping sequence, and since the modem uses a different frequency for every hop during data transmission and reception, the modem's error correction function even in a poor specific frequency environment data recovery is possible.

However, in this conventional radio, as shown in FIG. 1 - FIG. 1 is a diagram to explain the cosight phenomenon occurring in a two-channel radio - in the two-channel radio, each channel (CH.1 and CH.2) is mutually When hopping communication is performed by joining another communication network, the RF output 11 emitted from the transmitting channel (CH.1) inevitably enters strongly into the RF path of the receiving adjacent channel (CH.2) (12). Since it forms a strong RF noise layer of the reception channel, there is a problem in that the reception sensitivity 31 is remarkably reduced, causing a cosight phenomenon.

Accordingly, a wireless transmission/reception device and a wireless transmission/reception method according to the present invention devised to solve the above-described problems in the prior art will be disclosed below.

<p>From a first point of view for solving the above-described problem, the present invention provides a method for selecting a hopping frequency by referring to a hopping variable of an adjacent channel that matches the mutual frequency hopping synchronization between channels and determines a hopping pattern in a two-channel operable wireless transceiver. It is a technical task to provide a wireless transmission/reception device and a wireless transmission/reception method using the same.</p><p>In addition, from a second point of view for solving the above problems, the present invention provides an interworking interface designed to share frequency hopping timing information between each channel, transmission/reception information of each channel, and hopping variable information in a two-channel operable wireless transceiver. It is a technical task to provide a wireless transceiver device for preventing a signal transmitted from a transmission channel from entering a frequency reception band of an adjacent reception channel by providing it, and a wireless transmission/reception method using the same.</p><p>However, the technical problem of the present invention is not limited to the above-mentioned matters, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.</p>

<p>In order to achieve the above technical object, a wireless transceiver using frequency hopping according to the present invention provides a frequency of a transmission signal transmitted by the wireless transceiver using frequency hopping timing information of a reception signal received by the wireless transceiver. and an interworking interface that determines a hopping timing and determines a frequency hopping pattern of the transmission signal so that the hopping frequency of the transmission signal and the hopping frequency of the received signal do not interfere with each other by using the frequency hopping pattern information of the received signal. .</p><p>In addition, the interworking interface may include a hopping synchronization adjusting unit for synchronizing the frequency hopping timing of the received signal with the frequency hopping timing of the transmission signal.</p><p>In addition, the interworking interface preferably includes a hopping frequency selector for selecting and designating hopping frequencies of the transmission signal and the reception signal in real time so that the hopping frequencies of the transmission signal and the reception signal belong to different frequency bands at the same point in time. .</p><p>Meanwhile, in order to achieve the above technical problem, a wireless transceiver using frequency hopping according to the present invention includes a first terminal transmitting/receiving a first signal, a second terminal transmitting/receiving a second signal, and the The frequency hopping timing of the second signal is determined by using the frequency hopping timing information of the first signal that is interlocked with the first and second terminals and received by the first terminal, and the frequency hopping pattern information of the first signal is used and an interworking interface for determining a frequency hopping pattern of the second signal so that the hopping frequency of the second signal and the hopping frequency of the first signal do not interfere with each other.</p><p>Here, the interworking interface may include a transmission/reception state detection unit that detects whether the first and second terminals transmit/receive and turns on/off the operation of the interworking interface.</p><p>In addition, the interworking interface may include a hopping synchronization adjusting unit that synchronizes the frequency hopping timing of the first signal received by the first terminal and the frequency hopping timing of the second signal transmitted by the second terminal.</p><p>In addition, the interworking interface may include a hopping frequency selector for selecting and designating hopping frequencies of the first and second signals in real time so that the hopping frequencies of the first and second signals belong to different frequency bands at the same time point. desirable.</p><p>Also preferably, the hopping frequency selector includes a hopping variable extraction unit for extracting a hopping variable that determines a hopping frequency pattern of the first signal, and the first and and a hopping frequency generator configured to generate a hopping frequency by applying a predetermined algorithm to each of the second signals.</p><p>In addition, it is more preferable that the predetermined algorithm applied to the first and second signals, respectively, is the same algorithm that differs only in fixed variables from each other.</p><p>In addition, the predetermined algorithm is preferably a pseudo-random number generating algorithm.</p><p>In addition, the first terminal includes a first antenna unit for receiving the first signal through the first communication network, a first amplifier unit for amplifying a first signal received through the first antenna unit, and the first amplifier unit It may also include a first modem unit for receiving a signal output from the input and transmitting the signal to the interworking interface.</p><p>In addition, the second terminal includes a second modem unit for receiving a second signal that is controlled and output from the interworking interface, a second amplifier unit for amplifying a second signal output from the second modem unit, and the second amplification unit It is also preferable to include a second antenna unit for transmitting a second signal output from the unit to the second communication network.</p><p>In addition, the first terminal and the second terminal may be subscribed to different communication networks.</p><p>On the other hand, in order to achieve the above technical problem, a wireless transmission/reception method using frequency hopping according to the present invention comprises the steps of: (a) receiving a first signal from a first communication network; (b) of the received first signal The frequency hopping timing of the second signal transmitted to the second communication network is determined using the frequency hopping timing information, and the hopping frequency of the second signal and the hopping frequency of the second signal are determined using the frequency hopping pattern information of the first signal. and determining a frequency hopping pattern of the second signal so as not to interfere with each other.</p><p>Here, the step (b) includes (b1) synchronizing the frequency hopping timing of the first signal and the frequency hopping timing of the second signal, and (b2) the hopping frequencies of the first and second signals are the same Preferably, the method includes selecting and designating the hopping frequencies of the first and second signals in real time so as to belong to different frequency bands at a time point.</p><p>And, the step (b2) includes the steps of (b21) extracting a hopping variable for determining the hopping frequency pattern of the first signal, and (b22) using the hopping variable as an input variable for the first and second signals, respectively. It may also include applying a predetermined algorithm to generate a hopping frequency.</p><p>In addition, the predetermined algorithm respectively applied to the first and second signals may use the same algorithm in which only a fixed variable is different from each other.</p><p>On the other hand, in order to achieve the above technical problem, it would be desirable to provide a computer-readable recording medium in which a program for executing the wireless transmission/reception method according to the present invention in a computer is recorded.</p>

<p>According to the present invention for the contents described in this specification, a transmission signal of a transmission channel while performing frequency hopping communication by subscribing the same waveform to two channels to different communication networks in one wireless transceiver including two channels Thus, it is possible to implement a wireless transceiver that does not affect the reception sensitivity of the reception channel.</p><p>In addition, according to the present invention, since each channel can perform hopping communication in the full band, it is possible to maintain the full-band electronic counter-countermeasures (ECCM) effect.</p>

1 is a diagram illustrating a cosight phenomenon occurring in a two-channel radio; 2 is a diagram illustrating the function of a filter applied to a receiver and a transmitter in a conventional one-channel radio; 3 is a diagram illustrating a cosight phenomenon occurring in a conventional one-channel radio; 4 is a diagram illustrating a frequency synchronization process for performing hopping communication in a one-channel radio; 5 is a block diagram schematically showing a wireless transceiver according to an embodiment of the present invention; 6 is a block diagram schematically illustrating an interworking interface of a wireless transceiver according to an embodiment of the present invention; 7 is a flowchart illustrating a wireless transmission/reception method according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. When it is described herein that a component is connected to another component, this means that it may be directly connected to the other component or a third component may be interposed therebetween. First of all, it should be noted that in adding reference numerals to the components of each drawing, the same components are given the same reference numerals as much as possible even though they are indicated on different drawings. At this time, the configuration and operation of the present invention shown in the drawings and described by it is described as at least one embodiment, and the technical idea of the present invention and its core configuration and operation are not limited thereby.

Prior to the detailed description of the radio transceiver using frequency hopping according to the present invention, a description of a cosight phenomenon occurring in a conventional one-channel radio and a frequency synchronization process for performing hopping communication in a one-channel radio will be described.

In addition, the present invention relates to an apparatus for wirelessly transmitting and receiving data, but will be referred to as a radio in the following description. This is to emphasize that the field in which the present invention is mainly used is the electronic warfare (EW) field, and to maximize the effect of electronic counter- countermeasures (ECCM), and the present invention is limitedly applied only to the radio. It should be noted that it is not intended to be shown.

The conventional radio basically did not have two channels as a one-channel radio. However, when two one-channel radios are placed and operated in a short distance, cosight occurs when each radio joins a different communication network and performs jump communication.

Therefore, in the prior art, in order to solve this problem, m harmonic filters divided by the operating band were installed on the transmission path side of the radio to suppress unnecessary signals occurring in bands other than the transmission band, and the reception path side also operates the waveform By installing n cosight filters as much as the band, it was attempted to minimize the interference with each other by suppressing the noise signal coming from other radios operated adjacently.

More specifically, such a conventional one-channel radio is as shown in FIG. 2, - FIG. 2 is a diagram illustrating the function of a filter applied to a receiver and a transmitter in a conventional one-channel radio - any one of 1 When the channel radio is joined to the first communication network and operated as hopping communication, the switch of the harmonic filter and the cosight filter are turned on/off during reception to control the noise level of the hopping frequency signal as shown in FIG. 2b. and, on the receiving channel side, unwanted hopping frequency signals of other networks are removed.

However, when it is assumed that in a space adjacent to two different one-channel radios, one radio joins the first communication network and performs hopping communication, and the other radio joins the second communication network and performs hopping communication, each of the one-channel radios Tx, Rx period, or each instantaneous hopping frequency information operated by a unique hopping sequence was not shared.

Therefore, the cosite phenomenon was not solved even by this method, but the reason will be explained with reference to FIG. 3 .

3 is a diagram illustrating a cosight phenomenon occurring in a conventional one-channel radio.

As shown in FIG. 3, the conventional one-channel radio is designed by dividing the receiving-side operating band into n cosight filters as a way to prevent the above-described cosight phenomenon, but radio A is a channel belonging to the first communication network. signal of (f_a) is transmitted as a signal of the W band, and the radio B is a signal of a channel belonging to the second communication network (f_b) is received as a signal of W band and f belonging to different channels within the same bandwidth W_a, f_bWhen a signal is transmitted and received, the transceiver A_aThe weak level f that the transceiver B wants to receive by the output signal and transmit noise that transmits strongly in frequency_bThe cosight filter band of the W-band is set to f so that the frequency signal cannot be received._a saturating it with the components and noise of the signal, eventually causing the second radio to f_b This is because the signal cannot be received.

In the end, when different 1-channel radios are joined to different networks and operated with different hopping sequences in the area where cosight affects each other, the cosight phenomenon cannot be suppressed and the receiving band of the receiving radio is noisy. buried under the layer, making reception impossible, i.e. the selected transmit frequency f within the same cosite filter band._a, receiving frequency f_bThere is a need for a walkie-talkie that does not exist in the same band at the same time, and a wireless transmission/reception method using the same.

Hereinafter, a description of the present invention derived to solve the above problems is disclosed.

First, a transmission/reception process using frequency hopping will be described.

In order to perform frequency hopping communication, the timing of frequency change between radios to be communicated must be exactly the same every time. In order to do so, it is necessary to synchronize the frequency change time (leap point) with the receiving side's radio at every start of transmission. If the hopping synchronization is identical, from this point on, at every hopping frequency change time, one random frequency within the hopping range is selected through the hopping frequency selection algorithm. Here, the algorithm used to select the hopping frequency uses a hopping variable that is changed in real time as an input value. Therefore, if the hopping frequency selection algorithm and the hopping parameters are the same, the hopping frequencies selected in the wireless communication using frequency hopping are always the same.

In the end, if the mutual hopping synchronization, transmission/reception status, and mutual hopping variables are exchanged in real time between each channel in the two-channel radio, the cosight phenomenon can be prevented from occurring in the process of performing the two-channel hopping communication.

Next, a description of a frequency synchronization process for the radio to perform hopping communication will be described.

4 is a diagram illustrating a frequency synchronization process for performing hopping communication in a one-channel radio.

As shown in FIG. 4 , the transmitting side transmits a packet 40 including a preamble 41 and data 42 . Then, the receiving side extracts the frequency hopping timing synchronization (frequency hopping change time) and the hopping variable from the preamble 41 of the transmitted packet. Next, the receiving side generates a hopping frequency through a hopping frequency generator using the extracted hopping variable as an input variable. Here, the hopping frequency generator generates a hopping frequency by using an algorithm having a predetermined fixed variable.

In this way, the transmitting/receiving side is hop-changed to the same frequency every hop to transmit/receive data. In this way, the reception side synchronizes the transmission side frequency synchronization and the reception frequency with the transmission side, jumps to the same frequency at the same time, and transmits and receives information between each other.

On the other hand, in a two-channel radio, a frequency synchronization process exists in each of two adjacent channels, and when frequency hopping is performed using different hopping parameters, there is a problem in that a cosight phenomenon occurs between two channels.

Hereinafter, a detailed description of a two-channel radio for preventing cosight according to the present invention will be disclosed.

5 is a block diagram schematically illustrating a wireless transceiver according to an embodiment of the present invention.

As shown in FIG. 5 , the wireless transceiver 500 includes a first terminal 510 , a second terminal 520 , and an interworking interface 530 . Here, the first terminal 510 and the second terminal 520 can transmit and receive signals, but for convenience of explanation, hereinafter, the first terminal 510 is responsible for reception and the second terminal 520 is It should be noted that it will be described as responsible for the transmission.

The first terminal 510 is subscribed to the first communication network and transmits/receives the first signal R1 , and includes a first antenna unit 511 , a first amplifier unit 512 , and a first modem unit 513 . .

The first antenna unit 511 receives the first signal R1 through the first communication network and transmits it to a first amplifier 512 to be described later, and the first amplifier 512 includes a first antenna unit ( 511) amplifies the first signal received and transmits it to the first modem unit 513, and the first modem unit 513 receives the signal output from the first amplifying unit 512 and receives an interworking interface ( 530).

The second terminal 520 is subscribed to the second communication network and transmits/receives the second signal R2 , and includes a second antenna unit 521 , a second amplifier 522 , and a second modem unit 523 . .

The second modem unit 523 receives a second signal that is controlled and output from the interworking interface 530 to be described later and transmits it to the second amplifying unit 522, and the second amplifying unit 522 amplifies the signal to The second antenna unit 521 transmits the signal, and the second antenna unit 521 transmits the signal through the second communication network.

The interworking interface 530 operates in conjunction with the above-described first terminal 510 and the second terminal 520 , and frequency interference between the first terminal 510 and the second terminal 520 of the wireless transceiver 500 . is responsible for preventing A more detailed description of the interworking interface 530 will be described below with reference to FIG. 6 .

6 is a block diagram schematically illustrating an interworking interface of a wireless transceiver according to an embodiment of the present invention.

As shown in FIG. 6 , the interworking interface 530 includes a transmission/reception state detection unit 531 , a hopping synchronization control unit 532 , and a hopping frequency selection unit 533 .

The transmission/reception state detection unit 531 turns on/off the operation of the interworking interface 530 by detecting whether the first and second terminals (refer to 510 and 520 of FIG. 5 ) transmit/receive. That is, the transmission/reception state detection unit 531 detects the transmission/reception states of the first terminal and the second terminal, respectively, and determines whether the interworking interface 530 is operated. This is because the cosite interference phenomenon between the two channels does not become a problem in the state that the two-channel wireless transceiver 500 transmits both channels (RF signal output) or receives both channels (RF signal input). That is, in the case of the cosight phenomenon, when one channel transmits and the other channel receives, the output of an adjacent channel within the cosight filter band included in the receiving channel is input to its own input and transmitted at a long distance to be received. Since the low-power signal is buried in the transmission signal of the high-power adjacent channel and cannot be received, the transmission/reception state detection unit 531 operates the interworking interface 530 at this time.

The hop synchronization control unit 532 synchronizes the frequency hopping timing of the first signal R1 received by the first terminal 510 and the frequency hopping timing synchronization of the second signal R2 transmitted by the second terminal 520 . match the That is, when the hop synchronization control unit 532 transmits through the second terminal 520 in a situation in which the first terminal 510 subscribed to the first communication network is receiving a frequency with constant timing synchronization, the second terminal 520 ) adjusts the frequency hopping timing synchronization of the second signal R2 transmitted from the second terminal 520 so that all receiving radios provided in the second communication network to which the second terminal is subscribed to the hopping operation coincide with the synchronization signal of the first terminal .

The hopping frequency selector 533 selects and designates hopping frequencies of the first and second signals in real time so that the hopping frequencies of the first and second signals belong to different frequency bands at the same time point. That is, the hopping frequency selection unit 533 selects the next hopping frequency of the first signal and the second signal that are synchronized through the hopping synchronization adjusting unit 532 . In this case, the hopping frequency hops at the same time point so that the cosite interference phenomenon between the first terminal and the second terminal does not occur, and the hopping frequency is selected so as to belong to different frequency bands at the same time point.

Here, the hopping frequency selection process performed by the hopping frequency selection unit 533 will be described in detail.

The hopping frequency selecting unit 533 includes a frequency hopping frequency generating unit 534 and a hopping variable extracting unit 535 .

The hopping variable extraction unit 535 extracts a frequency hopping variable of the first signal. Here, the frequency hopping variable is a factor that determines the frequency hopping pattern. The interworking interface 530 receiving the first signal through the first terminal analyzes the hopping pattern of the first signal and extracts a hopping variable.

The hopping frequency generator 534 uses the frequency hopping variable extracted by the hopping variable extractor 535 as an input variable to generate hopping frequencies of the first and second signals. Here, in order to prevent the first terminal and the second terminal cosite phenomenon, both channels must hop simultaneously, but have different hop patterns and perform hopping communication through different communication networks. Accordingly, the hopping frequencies of the first signal and the second signal generated by the hopping frequency generator 534 should belong to different frequency bands. A process of generating the hopping frequencies of the first and second signals by the hopping frequency generator 534 will be described below.

The hopping frequency generator 534 applies a predetermined algorithm to each of the first signal and the second signal. Herein, a pseudo-random number generation algorithm may be used as an example of the predetermined algorithm. Hereinafter, a process of generating a hopping frequency using the pseudo-random number generation algorithm will be described. However, this does not mean that only the pseudo-random number generation algorithm can be applied as the predetermined algorithm, but only a pseudo-random number generation algorithm is described as an example in order to increase the understanding of the present invention.

Briefly introducing the pseudo-random number generation algorithm used in this specification, the pseudo-random number means a statistical random number that is repeatedly generated from an initial value given first. However, for random numbers in the precise meaning, the next number should not be known. In general, when a random number is generated using a computer, if one initial value is given, all the series of numbers appearing from the next are determined. This is called a pseudo-random number. Pseudo-random numbers are widely used in cryptographic algorithms, and a device for generating pseudo-random numbers is called a pseudo-random number generator (PRNG).

When the hopping frequency generator 534 applies the pseudo-random number generation algorithm, the pseudo-random number generation algorithm has a fixed variable, but applies the pseudo-random number generation algorithm to the first signal and the pseudo-random number generation algorithm to the second signal. In this case, the fixed variables should have different values. In addition, the pseudo-random number generation algorithm applied to the first signal and the second signal uses the frequency hopping variable extracted from the hopping variable extraction unit 535 as a common input variable.

That is, when a pseudo-random number generation algorithm having the same frequency hopping variable as an input variable is applied between the first terminal 510 and the second terminal 520 as an input variable, the hopping frequencies generated between both channels are mutually exclusive at the same point in time. It can be adjusted to belong to a different frequency band.

Here, the fixed variable serves to configure a communication network capable of mutual communication, and if the fixed variable is set identically, it means that mutual communication will be performed. (That is, from the operator's point of view, it is the same as the concept of adjusting the frequency during fixed frequency communication rather than hopping communication), and the hopping variable is a variable that is changed at every hop (the time that one frequency stays in the case of jumping), starting from 1. The count may be used or information such as the current time may be used to create a different variable for each leap. In addition, the pseudo-random number generation algorithm generates a random number by using the above-described fixed variable and the hopping variable as seed values in the hopping frequency generator. random value) and mapping this value to the hopping frequency according to a predetermined rule. Since pseudorandom number generation inevitably causes the generated value to be repeated with periodicity, it is preferable to use an algorithm in which the hopping frequency is random but has a long period, is random within the period, and generates the result so that the result is evenly distributed. good.

Next, a description of a wireless transmission/reception method according to an embodiment of the present invention is disclosed.

7 is a flowchart illustrating a wireless transmission/reception method according to an embodiment of the present invention.

As shown in FIG. 7 , the wireless transmission/reception method using frequency hopping includes the steps of receiving a first signal (S10), extracting a frequency hopping timing synchronization and a frequency hopping variable of the first signal (S20), a first and synchronizing the frequency hopping timings of the first and second signals (S30) and selecting and designating hopping frequencies of the first and second signals (S40).

A detailed description of the wireless transmission/reception method using frequency hopping according to the present invention can be fully understood from the above description of the wireless transmission/reception device, and thus the description thereof will be omitted for a brief description of the specification.

Meanwhile, the present invention includes a computer-readable medium including program instructions for performing various computer-implemented radio transmission/reception methods using frequency hopping. The computer-readable medium may include program instructions, data files, data structures, etc. alone or in combination. The medium may be those specially designed and configured for the present invention or those known and available to those skilled in the art of computer software. Examples of the computer-readable recording medium include magnetic media such as hard disks, floppy disks and magnetic tapes, optical media such as CD-ROMs and DVDs, and magnetic such as floppy disks. - includes magneto-optical media, and hardware devices specially configured to store and carry out program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine language codes such as those generated by a compiler, but also high-level language codes that can be executed by a computer using an interpreter or the like.

As described above, although the present invention has been described with reference to the limited embodiments and drawings, the present invention is not limited to the above embodiments, which are various modifications and Transformation is possible. Accordingly, the spirit of the present invention should be understood only by the claims set forth below, and all equivalents or equivalent modifications thereof fall within the spirit of the present invention.

500: wireless transceiver 510: first terminal 520: second terminal 530: interworking interface 511: first antenna unit 512: first amplifier unit 513: first modem unit 521: second antenna unit 522: second amplification unit 523: second modem unit 531: transmission / reception state detection unit 532: jump synchronization control unit 533: jump frequency selection unit 534: jump frequency extraction unit 535: jump variable extraction unit