SU1210229A1 - Multichannel non-coherent communication system - Google Patents

Description

the input of the comparator unit, where the inputs of the first and second matched filters are combined and are the main input of the channel demodulator, the second input of the key is the synchronization of the channel demodulator,

The invention relates to electrical and radio communications and can be used in wired, radio relay and space communication lines.

The purpose of the invention is to increase throughput.

The drawing shows the structure of an electrical circuit of a multi-channel non-coherent communication system.

The system contains on the transmitter side switches 1, a binary code generator 2, a major block 3, a transmitter 4, consisting of phase handler 5, phase difference handler 6, terminal block 7, carrier frequency generator 8. and synchro block 95 source 10 of synchronous messages, and on the receiving side channel demodulators 11, each of which consists of matched filters tZs, detectors, 13 beeps, comparison block 14, key 15 and driver 16 characters. main messages, receiver 17, sync block 185 cz mmator 19 ;, delay line 20 Lock 21 calculating the phase difference, the phase difference decoder 22, and line 23 communication.

The system works as follows.

On the transmitting side n - (, 2. „) Of the main binary synchronous channel signals 5 consisting of the symbols l and o, go to the control inputs of the switches 1, and in the generator 2 they form 2n orthogonal binary code sequences with a duration equal to the duration of the information symbols. Depending on the signal level at the control input of each switch 1, one of a pair of code sequences acting on its signal inputs is transmitted to its output. So

the driver of the main message symbols is the main output of the channel demodulator, and the outputs of the first and second matched f.pitrov are additional terminals of the channel demodulators.

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Thus, each of the main channels to be compressed corresponds to a certain pair of code sequences. I

The code sequences acting on the outputs of the switches 1 are added majoritarianly in the majority block 3, the output of which manipulates the phase (0,) oscillations of the carrier frequency generator 8 in the phase manipulator 5, for transmitting information m (, 2, ...) additional channels The source 10 of synchronous messages on the time intervals of the code messages of the output signal of the majority block 3, equal to the duration of the information symbols of the messages, in the phase difference manipulator 6, is an additional phase difference received signal received. It is then transmitted via the terminal unit 23 via the terminal unit 7. A sync block 9, to the second input of which information is entered about the end points of the code sequences from the binary code generator 2, and to the first carrier frequency 5 generates sync signals that are input to the group signal in the eye block 7. At the receiving side, from the output receiver 17, the group signal is fed to p channel demodulators 11, in each of which the matched filters 12 are matched with the corresponding signals of a certain pair of code sequences formed on the transmitting side. The output signals of matched filters 12 after detection in the envelope detectors 13 are compared with each other in magnitude in block 14 and at the moments of operation of the sync pulses, 1 corresponding in time to the ends of the code sequences at the outputs

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matched filters 12 generated by the sync block 18, the symbols of the main channels are formed. To extract information from the additional channels in the system, the output signals of the matched filters 12 are added up in the adder 19 and are fed to the block 21 for calculating the phase difference directly and through the delay line 20 with

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delay time, equal duration of information symbols. In block 21, for the duration of the synchronization pulse, equal to one or

5 several carrier periods, the difference between adjacent signals and the code is calculated. Based on the obtained results, symbols of additional channels are formed at the decoder 22.

Claims (3)

1. A MULTI-CHANNEL INCORRECT COMMUNICATION SYSTEM containing on the transmitting side η switches, the outputs of which are connected through the majority block to the main information input of the transmitter, as well as a binary code generator whose output is connected to the transmitter sync input, and the control inputs of η switches are information inputs main channels, and the signal inputs of each of the AND switches are connected to the corresponding outputs of the binary code generator, and on the receiving side, the receiver and channel demodulator in, the main inputs are combined and connected to the information output of the receiver, through which sinhrovyhod sync block is connected to the clock terminal η channel demodulators whose outputs are the outputs of the main system, characterized in that, in order to increase throughput, the transmitting storo-. a synchronous message source has not been input, the outputs of which are connected to m additional inputs of the transmitter, and a series-connected adder, a delay line, a phase difference calculation unit and a phase difference decoder are introduced on the receiving side, the first and second additional outputs of each of the channel demodulators and connected to the corresponding inputs the adder, the output of which is connected to the second input of the phase difference calculation unit, the sync input of which is combined with the sync inputs of the channel demodulators. 2. A communication system according to claim 1, wherein the transmitter consists of a series-connected phase manipulator, phase, difference manipulator and terminal block, as well as a carrier frequency generator and a sync block, the output of which is connected to the second input of the terminal block moreover, the output of the carrier frequency generator is connected to the inputs of the phase manipulator and the sync block, the second inputs of which are the main information input and the sync input of the transmitter, respectively. 3. The communication system of claim. ^ Characterized in that the channel demodulator consists of a series-connected first matched filter, a first envelope detector, a comparison unit, a key and a character generator of main messages, as well as series-connected a second matched filter and a second envelope detector, the output of which connected to the second> the input of the comparison unit, and the inputs of the first and second matched filters are combined and are the main input of the channel demodulator, the second key input is the clock of the channel demodulator, the output of the main message generator is the main output of the channel demodulator, and the outputs of the first and second matched filters are additional outputs of the channel demodulators .