RU2762574C1 - Radio communication system - Google Patents

Abstract

FIELD: communication.

SUBSTANCE: invention relates to communication equipment and can be used in automatic packet radio communication of the high-frequency range. In order to realize the technical result, technical means providing procedures for spatial and frequency channel separation, interference-resistant encoding, interlacing and the use of a reverse channel in order to implement the advantage of information feedback in the system are introduced into the system.

EFFECT: increased interference immunity of the system.

1 cl, 2 dwg

Description

SUBSTANCE: invention relates to automatic packet radio communication of high-frequency (HF) range (3-30) MHz.

Known analogue - HF packet data exchange system [1], which contains HF onboard stations connected through HF radio channels "Air-Earth" with HF ground stations. The HF ground stations, in turn, are connected through the ground communication subsystem to the control center of the said system and to the air traffic control centers and airlines. Each HF ground station contains an HF ground station controller, which is connected by control with N HF transmitters connected to N HF transmitting antennas, with N HF Air-to-Ground receivers connected to a common HF receiving antenna, as well as information inputs of N modulators a single-tone multi-position phase-shift keyed signal connected to N RF transmitters is connected to the information outputs of the N air-to-ground demodulators of a single-tone multi-position phase-shift keyed signal. N air-to-ground demodulators are connected to N RF receivers. The HF ground station controller is also connected to a UT signal receiver connected to the UT signal receiving antenna and to an interface device with a ground communication subsystem. Each HF ground station contains at least one additional HF ground-to-ground communication receiver and at least one additional ground-to-ground demodulator of a single-tone multi-position phase-shift keyed signal, the output of which is connected to an additional information input of the HF ground station controller , and the input - to the output of the additional RF receiver "Earth-Earth". The information input of the additional HF receiver "Ground-Ground" is connected to the common HF receiving antenna, and its control input is connected to the additional control output of the HF ground station controller.

The disadvantages of the analogue include:

- in case of failure of the control center of the HF packet data exchange system or a segment of the ground communication network, the process of controlling the elements of the system is disrupted, which reduces the efficiency of its operation and makes it impossible to transfer information from control points through the HF ground station of the "last communication" to the selected "important" aircraft the crew of which urgent information is required;

- the use of the technology for choosing the best communication frequencies is not provided;

- mutual synchronization of exploded objects is not provided.

Known HF packet data exchange system [2], containing HF onboard stations, connected through HF radio channels "Air-Earth" with HF ground stations. They, in turn, are connected to the control center of the said system and to the air traffic control centers and airlines through the ground communication subsystem. Each HF ground station contains an HF ground station controller, which is connected by control with N HF transmitters connected to N HF transmitting antennas, with N HF Air-to-Ground receivers connected to a common HF receiving antenna, connected to the information inputs of N radio signal modulators connected to N RF transmitters is also connected to the information outputs of the N air-to-ground radio signal demodulators. The demodulators are connected to N RF receivers. The controller of the HF ground station is connected to the receiver of the UT signals, connected to the receiving antenna of the UT signals, and to the interface device with the ground communication subsystem. Each HF ground station has at least one RF ground-to-ground receiver and at least one RF ground-to-ground demodulator. The output of the demodulator "Ground-Ground" radio signal is connected to the information input of the controller of the HF ground station, and the input is connected to the output of the corresponding HF receiver "Ground-Ground". The information input of the RF receiver "Ground-Ground" is connected to the common RF receiving antenna, and the control input is connected to the corresponding control output of the RF ground station controller. In the HF onboard station, the onboard HF transceiver is connected, on the one hand, to the antenna matching device, and on the other hand, to the HF data exchange control device, which is connected, on the one hand, to the onboard HF transceiver, and on the other hand, to the control panel (CP) of the radio station and the onboard router (BM). The antenna matching device is connected on one side to the onboard HF transceiver and on the other side to the onboard HF antenna. HF airborne stations relay messages received via HF radio channels "Air-to-Earth" from HF ground stations, HF radio channels "Air-Air" and from the corresponding HF airborne stations operating in the relay mode. The leading HF ground station for the corresponding zone is connected to the ground communication subsystem via Earth-Earth channels to the corresponding HF ground stations, including those inaccessible from the ground communication subsystem, and via HF Earth-to-Air radio channels - to the corresponding HF airborne stations requiring urgent information.

The HF ground station has L HF demodulators of radio signals for relayed messages and ionospheric monitoring signals, connected on the one hand to the HF ground station controller, on the other hand, through H corresponding HF receivers for receiving relayed messages and ionospheric monitoring signals to a common HF receiving antenna, and their 2H control inputs are connected to the corresponding control outputs of the RF ground station controller.

The HF on-board station has an HF receiving antenna connected via K parallel HF receivers to the corresponding K inputs / outputs of the HF data exchange control device, a message relay device connected to the corresponding input / output of the HF data exchange control device, a time signal receiver connected to the receiving antenna of the time signals and to the corresponding input / output of the HF data exchange control device.

The analogue has the following disadvantages:

- there is no possibility of duplication of communication channels;

- the use of the technology for choosing the best communication frequencies is not provided;

- mutual synchronization of exploded objects is not provided.

Known complex of means of protection of narrow-band radio communication systems in a complex radio-electronic environment, which for most of the essential features is taken as a prototype [3]. It contains on the transmitting side of the radio communication system a serially connected source of messages, a discrete signal generator, an encoder, a phase former, a phase modulator, a power amplifier and a transmitting antenna, a generator of the original FM signals of the transmitting side, the outputs of which are connected to the corresponding inputs of the adder of the original FM signals, the outputs of the adder original FM signals are connected to the corresponding inputs of the encoder.

On the receiving side, the complex contains a serially connected receiving antenna, a microwave amplifier and a phase demodulator, as well as a decisive threshold device, the first input of which is connected to the output of the threshold shaper, and the output of the decisive threshold device is connected to the input of a converter of discrete message signals, from the output of which information is supplied to consumers ... Also on the receiving side, the complex contains a generator of initial FM signals, a serially connected analog-to-digital signal converter, a signal scaler for time compression of a FM video signal packet, a pulse noise compensation device, an interpolation device, an amplitude normalizing device and a decoder with correlation processing of FM signals a message, the outputs of which are connected to the corresponding inputs of the binary signals adder. The output of the adder of discrete signals is connected to the second input of the decision threshold device. The outputs of the generator of the original PM signals of the receiving side are connected to the corresponding inputs of the decoder with correlation processing of PM signal signals, while the input of the analog-to-digital signal converter is connected to the output of the phase demodulator.

The prototype has the following disadvantages:

- taking into account the geophysical features of the country, the complex does not use the possibility of spatial and frequency separation of channels;

- there is no possibility of duplication of a failed communication complex, i.e. the aircraft will not receive control information, and from them - the corresponding receipts and reports;

- the value of the bit probability P _b = 10 ^-4 is not enough for the transmission of some priority signals;

- complex coding is carried out only for channel compaction;

- there is no reverse communication channel, as a result of which the possibilities of increasing noise immunity by introducing information or decisive feedback are not used;

- the important procedure of mutual synchronization of the transmitting and receiving sides of the complex is not shown;

- the complex lacks protection against grouping of errors in the channel due to fading of the radio signal along the path of propagation of radio waves of the HF range.

The technical result of the invention is to increase the noise immunity of the system by introducing procedures for spatial and frequency diversity of channels, duplicating a failed complex with other complexes, introducing a noise-immune coding procedure at system objects, introducing a reverse channel to realize the advantages of information feedback, ensuring mutual synchronization of signal processing means on the transmitting and receiving sides, the introduction of protection against grouping errors that appear in the communication channel due to fading of the radio signal along the path of propagation of radio waves of the HF range by interleaving the symbols in the transmitted message.

The specified technical result is achieved by the fact that the radio communication system contains equipment spaced apart and interconnected by a radio communication channel of the HF range of the transmitting and receiving sides of the radio communication system, each of which contains m communication complexes of the forward transmission direction and b communication complexes of the reverse transmission direction, where m≥ 2 and b≥2, while the transmitting side of the radio communication system contains an information source, a decision circuit, m transmitting parts of communication complexes and b receiving parts of communication complexes, and the receiving side of a radio communication system contains an information receiver, a decision circuit, m receiving parts of communication complexes and b transmitting parts of communication complexes, the output of the information source is connected to the inputs of m complexes of the forward direction of transmission, the input of the information source is connected to the output of the decisive circuit of the transmitting side of the radio communication system, to the corresponding inputs of which the outputs of b complexes of the reverse direction of transmission are connected, the outputs of m complexes of the forward the transmission directions are connected to the corresponding inputs of the decision circuit of the receiving side of the radio communication system, the first output of which is connected to the input of the information receiver, and the second output is connected to the inputs b of the reverse transmission direction complexes.

Each transmitting part of the communication complex contains a serially connected generator of discrete signals, an error-correcting coding device, an interleaver, an encoder, a phase former, a phase modulator, a power amplifier and a transmitting antenna, as well as a generator of the original FM signals of the transmitting part of the communication complex, the outputs of which are connected to the corresponding inputs of the adder of the original FM signals, the outputs of the adder of the original FM signals are connected to the corresponding inputs of the encoder, the output of the receiver of signals of the global navigation satellite systems of the transmitting part of the communication complex is connected to the synchronization input of the calculator of the transmitting part of the communication complex and through it to the synchronization inputs of the anti-jamming coding devices, the interleaver, the generator of the original FM signals of the transmitting part of the communication complex, the adder of the initial FM signals, the phase former, the phase modulator and the discrete signal generator, which has an input for connecting an information source or the decision circuit of the receiving side of the radio communication system, each receiving part of the communication complex contains a serially connected receiving antenna, a microwave amplifier, a phase demodulator, an analog-to-digital signal converter, a signal scaler for compressing the FM video signal packet in time, a pulse noise compensation device, an interpolation device , an amplitude normalizing device and a decoder with correlation processing of FM signal signals, the outputs of which are connected to the corresponding inputs of the adder of discrete signals; to the input of the decision threshold device, to the second input of which the threshold is connected, the output of the decision threshold device is connected through a series-connected deinterleaver and a noise generator stable decoding to the input of the converter of discrete message signals, the output of the receiver of signals of global navigation satellite systems of the receiving part of the communication complex is connected to the synchronization input of the calculator of the receiving part of the communication complex and through it to the synchronization inputs of anti-jamming decoding devices, deinterleavers, analog-to-digital signal converter, signal scale converter , a device for compensation of impulse noise, an interpolation device, an amplitude normalizing device, a generator of the initial FM signals of the receiving part of the communication complex, an adder of discrete signals, a threshold shaper and a converter of discrete signals, which has an output for connection to the input of the decision circuit, while the calculator of the receiving part of the communication complex has an output for connection to the synchronization input of the decision circuit.

The invention is illustrated by the figures. FIG. 1 shows a block diagram of a radio communication system, FIG. 2 shows a block diagram of the communication complex. The following symbols are introduced on the figures:

1 - source of messages;

2 - discrete signal generator;

3 - encoder;

4 - generator of the original FM signals of the transmitting part of the communication complex 30;

5 - adder of initial FM signals;

6 - phase former;

7 - phase modulator;

8 - power amplifier;

9 - transmitting antenna;

10 - receiving antenna;

11 - microwave amplifier;

12 - phase demodulator;

13 - analog-to-digital signal converter;

14 - signal scale converter;

15 - device for compensation of impulse noise;

16 - interpolation device;

17 - amplitude normalizing device;

18 - decoder with correlation processing;

19 - generator of the initial FM signals of the receiving part of the communication complex 32;

20 - adder of discrete signals;

21 - decisive threshold device;

22 - threshold shaper;

23 - discrete signal converter;

24 - anti-jamming coding device;

25 - interleaver;

26 - anti-jamming decoding device;

27 - deinterlacer;

28 - receiver of signals from global navigation satellite systems;

29 - calculator of the transmitting part of the communication complex 30;

31 - calculator of the receiving part of the communication complex 32;

33 is a decision circuit;

34 - recipient of information;

35 - transmitting side of the radio communication system;

36 - the receiving side of the radio communication system.

Units that are standard for radio communication systems, for example, power supplies and the like, in FIG. 2 are not shown.

The proposed radio communication system has a transmitting 35 and a receiving side 36, and each communication complex used in the proposed radio communication system consists of a transmitting 30 and a receiving part 32, interconnected by a radio communication channel of the HF range. All communication complexes in the system are identical in architecture, but depending on the function performed, they are divided into m complexes of the forward direction of transmission and b complexes of the reverse direction of transmission, with m≥2 and b≥2. The transmitting side of the radio communication system 35 contains a source of information 1, a decision circuit 33, m transmitting parts of communication complexes 30 and b receiving parts of communication complexes 32. The receiving side of the radio communication system 36 contains an information receiver 34, a decision circuit 33, m receiving parts of communication complexes 32 and b transferring parts of communication complexes 30.

The output of the information source 1 is connected to the inputs of m complexes of the forward transmission direction, the input of the information source 1 is connected to the output of the decision circuit 33 of the transmitting side of the radio communication system, to the corresponding inputs of which the outputs b of the complexes of the reverse transmission direction are connected. The outputs m of the forward transmission direction complexes are connected to the corresponding inputs of the decision circuit 33 of the transmitting side of the radio communication system, the first output of the decision circuit 33 of the receiving side of the radio communication system is connected to the input of the information receiver 34. The second output of the decision circuit 33 of the receiving side of the radio communication system is connected to the inputs b of the reverse direction complexes transmission.

The transmitting part of the communication complex 30 includes a discrete signal generator 2, an encoder 3, a generator of initial PM signals 4, an adder of initial PM signals 5, a phase former 6, a phase modulator 7, a power amplifier 8, a transmitting antenna 9, an error-correcting coding device 24, an interleaver 25, a receiver of signals of global navigation satellite systems 28, a computer 29. In the case when the transmitting part of the communication complex 30 is part of the forward transmission direction complex, the output of the information source 1 is connected to the input of the discrete signal generator 23. If the transmitting part of the communication complex 30 is included into the complex of the reverse transmission direction, the output of the decision circuit 33 of the receiving side of the radio communication system 36 is connected to the input of the discrete signal generator 23.

The receiving part of the communication complex 30 includes a receiving antenna 10, a microwave amplifier 11, a phase demodulator 12, an analog-to-digital signal converter 13, a signal scaler 14, a pulse noise compensation device 15, an interpolation device 16, an amplitude normalizing device 17, a decoder with a correlation processing 18, generator of original PM signals 19, adder of discrete signals 20, decision threshold device 21, threshold driver 22, converter of discrete signals 23, anti-jamming decoding device 26, deinterleaver 27, receiver of signals of global navigation satellite systems 28, calculator 31.

An increase in the noise immunity of a radio communication system is ensured by choosing the optimal radio signal from m communication complexes with the highest signal-to-noise ratio for transmitting messages from the source, as well as by interleaving the symbols in the message, which ensures the conversion of group errors into single ones, and then their detection and correction with using procedures of error-correcting coding. If the message is not reliably received, the decision circuit 33 of the receiving side of the radio communication system 36 generates data on the incorrect packet and sends it to the message source 1 through b communication complexes of the reverse transmission direction, which allows the proposed radio communication system to obtain the advantages of a system with information feedback.

The radio communication system works as follows. Source 1 sends a message to the input of one of the m transmitting parts of the communication complexes 30 of the direct transmission direction with the optimal radio channel. In the transmitting part of the communication complex 30 of the forward direction of transmission, the message is encoded, interleaved, converted using modulation into radio signals and, after amplification through the antenna and the air, is radiated to the receiving side 32 of the radio communication system. After receiving, the radio signal is amplified, converted by demodulation into a video signal, deinterleaved, decoded, further processed and fed to the input of the decision circuit 33 of the receiving side of the radio communication system 36, where the reliability of receiving the message of the direct transmission direction and the need to transmit data to the receiver 34 of the information is determined. If the message is not reliably received, the decision circuit 33 of the receiving side of the radio communication system 36 generates data on the number of the wrong packet and sends it to the message source 1 via one of b communication complexes of the reverse direction. On the transmitting side 35 of the radio communication system, from the output of the receiving part 32 of the reverse direction communication complex, the message is sent to the decision circuit 33 of the transmitting side of the radio communication system 35, and then the request for retransmission of the corresponding message is transmitted to the source 1 of messages. If the required message is not received at a given time, a repeated request is generated on the decision circuit 33 of the receiving side of the radio communication 36 using the above procedures.

On the transmitting side 35 of the radio communication system, the message is formed in the source 1 of messages, for example, in the form of a text message from a sequence of alphabet letters, each of which is encoded with a specific sequence of numbers 0 and 1, and is transmitted to the generator 2 of discrete signals of the transmitting part 30 of the communication complex.

In the generator 2 of discrete signals, text messages are converted into a sequence of discrete signals with an amplitude of 0 and 1, which are fed to the input of the error-correcting coding device 24, where redundant symbols are introduced into the message in accordance with the rules of error-correcting coding, for example, the Reed-Solomon code, then in the node 25, the interleaving operation is performed (symbols in the message are interchanged according to a known law). Then the discrete data is fed to the first input of the encoder 3, to the other inputs of which the code phase-shift keyed (PM) signals are received from the generator of code PM signals, consisting of the generator 4 of the original PM signals of the transmitting part of the communication complex and the adder 5 of the original PM signals. The original PM signals are formed, for example, in the form of orthogonal elements of the derivative signal system, the autocorrelation function (ACF) of which has small side lobes, by multiplying (summing modulo 2) element by element, for example, two phase-shift keyed Walsh codes with orthogonality properties, and a Barker code having an autocorrelation function with small side lobes [3].

As the base codes, for example, M = 4 for Walsh codes and a 4th order Barker code N = 4 can be selected.

The spectrum width of the elements of the selected derivative signal system is determined by the convolution of the spectra of the Walsh and Barker codes, respectively, and will be determined by the spectrum width determined by the duration of one discrete element of the Barker code [3].

In the adder 5 of the original PM signals, time alignment and addition are performed, for example, M = 4 of the original PM signals at N = 4. As a result of this, a packet of parallel assembly of N = 4 discrete signals with relative amplitudes equal to (-2) or 0 is formed, from which a packet of the code PM signal with amplitudes equal to (-1) or 1 is formed.

In encoder 3, each discrete binary signal of duration τ _{and is} converted by a packet of the code PM signal into a packet of PM signal of the message from N = 4 discrete signals with the same amplitudes equal to (-1) or 1 (phases I or 0). The thus-generated PM signal packet in encoder 3 can be transmitted using 2-PM phase modulation in the bandwidth of the radio communication system.

From the output of the encoder 3, the packet of FM signals is fed to the phase shaper 6, after which it is processed by a 2-FM phase modulator 7 in the passband of the radio communication system and, having passed the power amplifier 8 with the help of the transmitting antenna 9, is emitted at one carrier frequency into the communication channel.

On the receiving side of the radio communication system 36 in the receiving part of the communication complex 32, after the receiving antenna 10, the microwave amplifier 11 and the phase demodulator 12, the FM video signal packet of the message is fed to the input of the analog-to-digital converter 13 for converting and processing the FM message video signal packet.

At the output of the analog-to-digital signal converter 13, a signal scale converter 14 is connected for time compression of the FM video signal packet in order to reduce the time of its conversion and processing.

From the output of the signal scale converter 14, the FM video signal packet is fed to the device 15 for compensating impulse noise, the use of which is explained as follows. Impulse noise is concentrated in time and is a random sequence of impulses with random amplitudes that change from minimum to maximum in a time commensurate with the time of a unit sending interval, and following each other at random intervals. In this case, impulse noise is superimposed on the useful signal in the phase demodulator, which leads to errors in the extraction of phase information.

However, compensation (cutting out or reducing the level) of impulse noise, coinciding with the discrete message signal, also causes an error during demodulation, therefore, an interpolation device 16 is installed at the output of the impulse noise compensation device 15, which, for example, based on two (or more) neighboring samples of the packet discrete message signals at the output of the device 15 for compensation of impulse noise restores phase information [4, 5].

From the output of the interpolation device 16, the PM video signal packet is fed through the amplitude normalizing device 17 to the first input M = 4 of the channel decoder 18 with correlation processing, the other inputs of which receive M = 4 of the original PM signal from the generator 19 of the original PM signals.

Due to the correlation processing in the M = 4 channel decoder 18, the spectral densities of interference and noise when multiplied by copies of the original PM signals are expanded. As a result, in the frequency band of each channel of the correlator, the interference and noise powers are attenuated in accordance with the value of the base B = 4, i.e. there is an increase in the signal-to-noise ratio by 6 dB [6, 7].

From the outputs M = 4 of the channel decoder 18 with correlation processing, noise and discrete signals in the form of autocorrelation functions are fed to the inputs of the adder 20 of discrete signals. In this case, due to the fact that the side lobes of the ACF do not exceed the level of 0.25 from the main lobe and are in antiphase [3], when they are summed at the output of M = 4 channel decoder 18 with correlation processing, the side lobes of the ACF are eliminated, since the autocorrelation functions noise are in antiphase, as are the side lobes of the ACF of discrete message signals [3].

As a result, at the output of the adder 20 of discrete signals, an increase in the signal-to-noise ratio of at least N = 4 times can be provided, i.e. by 6 dB [3].

Thus, due to the application of the proposed technical solution, the total gain in the signal-to-noise ratio in the proposed system can potentially be at least 12 dB [3], which confirms the results of comparing the noise immunity of radio communication systems built using the proposed technology in comparison with the use of OFDM technology in broadband radio communication systems given in [3, 8]. This corresponds to a decrease in the probability of a bit error from P _b = 10 ^-2 to P _b = 10 ^-4 in a Gaussian communication channel while maintaining the same probability of reliable data transmission [9].

From the output of the adder 20 of discrete signals, discrete signals are fed to the first input of the decision threshold device 21, the second input of which receives the threshold voltage from the threshold driver 22, made, for example, on a digital-to-analog converter.

From the output of the decision threshold device 21, discrete signals are fed to the input of the deinterleaver 27, where the operation of converting group errors into single errors is carried out by setting the symbols in the message to their places according to a known law. From the output of the deinterleaver 27, discrete signals are fed to the input of the error-correcting decoding device 26, where, in accordance with the rules of error-correcting coding, for example, the Reed-Solomon code, single errors are detected and corrected. Then the message is fed to the input of the discrete signal converter 23, in which the discrete message signals are converted to a form convenient for the decision circuit 33 and the information receiver 34.

On each transmitting part 30 of the communication complex for mutual time synchronization of the transmitting 30 and receiving 32 parts of the communication complex, the output of the corresponding receiver 28 of signals of global navigation satellite systems is connected to the synchronization input of the corresponding calculator 29, and through it to the synchronization inputs of the error-correcting coding device 24, the interleaver 25, a discrete signal shaper 2, a shaper of the original PM signals 4, an adder of the original PM signals 5, a phase shaper 7, a phase modulator 7.

At each receiving part 32 of the communication complex, the output of the corresponding receiver 28 of signals of global navigation satellite systems is connected to the synchronization input of the corresponding calculator 31 and through it to the synchronization inputs of the anti-jamming decoding device 26, the deinterleaver 27, the analog-to-digital signal converter 13, the signal scale converter 14, the device compensation of impulse noise 15, interpolation device 16, amplitude normalizing device 17, shaper of initial FM signals 19, adder of discrete signals 20, shaper of threshold 22, converter of discrete signals 23. The calculator of the receiving part of the communication complex has an output for connecting to the synchronization input of the decision circuit 33. Calculators 29 and 31 generate, for example, continuous sequences, bursts of pulses and other signals synchronized with a single global time and necessary for the operation of the above processing means.

The proposed technical solution can be implemented on the elements of the SDR software and hardware platform [10], the signal-code structure - using OCDM technology and serial computing.

The proposed technical solution not only preserves the advantages of the prototype, but also improves noise immunity due to:

- introduction of procedures for spatial and frequency division of channels;

- duplication of the failed complex with other complexes;

- introduction of anti-noise coding procedures;

- introduction of a reverse channel to realize the advantages of systems with information feedback;

- ensuring mutual synchronization of signal processing means at the transmitting and receiving sides of the radio communication system;

- the introduction of protection against grouping errors that appear in the communication channel due to fading of the radio signal along the path of propagation of radio waves of the HF range by interleaving the symbols in the transmitted message.

Literature:

1. RF patent No. 2286030, publication date 10/20/2006 Byull. No. 29.

2. RF patent No. 2612276, publication date 03/06/2017 Byull. No. 7.

3. RF patent No. 2720215, publication date 04/28/2020 Byull. No. 13 (prototype).

4. Radiotechnical methods of information transmission: Textbook for universities / Borisov VA, Kalmykov VV, Kovalchuk Ya.M. and etc.; Ed. V.V. Kalmykov. M .: Radio and communication. 1990.304 p.

5. Goncharov V.L. The theory of interpolation and approximation of functions. M., 1954.327 p.

6. Proxis John. Digital communication. Per. from English / Ed. Klovsky D.D. - M .: Radio and communication, 2000.800 p.

7. Grigoriev V.A., Lagutenko O.I., Raspaev Yu.A. Radio access networks and systems. - M .: Eco-Trends, 2005.384 p.

8. Nikolaev V., Garmonov A., Lebedev Y. Systems of broadband radio access of the 4th generation: the choice of signal-code structures. Concern "Constellation", Scientific and technical journal "First Mile". Issue 5-6, 2010, 56-59 p.

9. Ermolaev V.T., Flaksman A.G. Theoretical foundations of signal processing in wireless communication systems: Monograph. - Nizhny Novgorod: Nizhny Novgorod State University, 2010.312 p.

10. Keistovich A.V. Systems and technology of radio communication in aviation: textbook. allowance / A.V. Keistovich, A.V. Komyakov - Nizhny Novgorod: NSTU, 2012 .-- 226 p.

Claims (1)

A radio communication system containing equipment spaced apart and interconnected by a radio communication channel of the HF range of the transmitting and receiving sides of the radio communication system, each of which contains communication complexes, including m transmitting parts and b receiving parts, where m ≥ 2 and b ≥ 2, while the transmitting side of the radio communication system contains an information source, a decision circuit, and the receiving side of the radio communication system contains an information receiver, a decision circuit, the output of the information source is connected to the inputs of m transmitting parts of the communication complex of the transmitting side of the radio communication system, the input of the information source is connected to the output of the decision circuit of the transmitting side of the system radio communication, to the corresponding inputs of which the outputs b of the receiving parts of the communication complex of the transmitting side of the radio communication system are connected, the outputs of m transmitting parts of the communication complex of the receiving side of the radio communication system are connected to the corresponding inputs of the decision circuit of the receiving side of the radio communication system, the first output of which is connected with the input of the recipient of information, and the second output is connected to the inputs b of the receiving parts of the communication complex of the receiving side of the radio communication system, while each transmitting part of the communication complex contains a serially connected generator of discrete signals, an error-correcting coding device, an interleaver, an encoder, a phase former, a phase modulator, an amplifier power and the transmitting antenna, as well as the generator of the initial FM signals of the transmitting part of the communication complex, the outputs of which are connected to the corresponding inputs of the adder of the initial FM signals, the outputs of the adder of the original FM signals are connected to the corresponding inputs of the encoder, the output of the signal receiver of the global navigation satellite systems of the transmitting part of the communication complex is connected with the synchronization input of the calculator of the transmitting part of the communication complex and through it with the synchronization inputs of the noise-immune coding devices, the interleaver, the generator of the initial FM signals of the transmitting part of the communication complex, the adder of the initial FM signals, a phase shaper, a phase modulator and a discrete signal generator, which has an input for connecting an information source or a decision circuit of the receiving side of a radio communication system, each receiving part of a communication complex contains a serially connected receiving antenna, a microwave amplifier, a phase demodulator, an analog-to-digital signal converter , a signal scaler for time compression of a PM video message packet, an impulse noise compensation device, an interpolation device, an amplitude normalizing device and a decoder with correlation processing of PM signal signals, the outputs of which are connected to the corresponding inputs of the adder of discrete signals, to the corresponding inputs of the decoder with correlation processing FM signals are connected to the outputs of the generator of the initial FM signals of the receiving part of the communication complex, the output of the adder of discrete signals is connected to the first input of the decisive threshold device, to the second input of which is The threshold shaper is connected, the output of the decisive threshold device is connected through a series-connected deinterleaver and a noise-immune decoding device to the input of the discrete signal converter, the output of the signal receiver of global navigation satellite systems of the receiving part of the communication complex is connected to the synchronization input of the calculator of the receiving part of the communication complex and through it to the synchronization inputs of the devices noise-immune decoding, deinterleaver, analog-to-digital signal converter, signal scale converter, pulse noise compensation device, interpolation device, amplitude normalizing device, generator of initial FM signals of the receiving part of the communication complex, adder of discrete signals, threshold shaper and converter of discrete signals, which has an output for connection to the input of the decision circuit, while the calculator of the receiving part of the communication complex has an output for connecting to the synchronization input re sewing scheme.

Images