SU1403385A2 - Multichannel incoherent communication system - Google Patents

Description

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The invention relates to radio engineering and communication, in particular to multichannel broadband communication systems.

The aim of the invention is to improve the noise immunity of communications.

The drawing shows a structural electrical circuit of a multichannel non-coherent communication system.

The multichannel non-coherent communication system contains n switches 1, generator 2 of binary orthogonal code, majority block 3, phase switch 6, carrier frequency generator 5, phase difference manipulator 6, transmitter 7, sync block 8 receiver, 9, optimal processing blocks 10, each of which consists of two matched filters 11, two envelope detectors 12 and a comparison unit 13, a driver of 14 channel symbols, an adder 15, a delay line. 16, a phase difference calculating unit 17, a phase difference decoder 18, a synchronization synchronization unit 19, a communication line 20, an adder

21 modulo two, additional unit

22 comparisons and decision block 23.

A multichannel non-coherent communication system operates in the following manner.

 On the front side of the n (n 2, 3, ...) binary synchronous channel signals are fed to the control inputs of switches 1, in the generator 2 two orthogonal code sequences are formed with a duration equal to the duration of the information symbols The control input of each switch 1 is fed to its output by one of a pair of code sequences acting on its code

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5 0 5

0

five

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symbol 1 5 if the number of channel symbols 1 received at its input is not (ambient, otherwise sim), wave O, These signals received at the input of the phase difference manipulator 6 are used for single phase difference manipulation of modulated adjacent A code bit, which is then transmitted by the transmitter 7 via the communication line 20. The sync block 8, to the first input of which information about the ends of the code sequences is entered, and the second frequency, generates sync signals that are input to the group signal transmitters are 7. On the receiving side from the output 9 of the receiver baseband signal is supplied to the inputs of blocks 10, in each of which first and second matched filters 11 matched with sootvetstvukschimi signals specific pair of code sequences generated on transmission. The output signals of matched filters

11after detection in detectors

12 are compared to each other in size in block 13 and the largest of them with a certain sign (positive for the first detector and negative for the second) go to the inputs of the formers 14 and the additional block 22, Formers 14, at the times of the clock pulses corresponding to the ends of the code sequences at the outputs of matched filters 11 generated by block 19, messages are generated that arrive at the first information inputs of the decision block 23, and in the additional block. 22 determines the channel number with the lowest absolute signal level. Adder 15, delay lines 16, block 17 and decoder 18

entrances. Thus, each of the cad-ds is used to distinguish between

There is a certain pair of code sequences. The sequences acting on the outputs of the switches 1 are processed by the majority in the majority block 3, the output signal of which manipulates the oscillation phase of generator 5 in phase manipulator 4. The modulated code message arrives at the first input of phase difference controller 6,

If the number of symbols 1 at the information inputs is odd, the channel symbol with the lowest signal level changes to the opposite one, otherwise the channel symbols are transmitted to output of decision block 23 without change.

VNIIPI Order 3005/56 Circulation 660

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used to test

If the number of symbols 1 at the information inputs is odd, the channel symbol with the lowest signal level changes to the opposite one, otherwise the channel symbols are transmitted to output of decision block 23 without change.

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Claims (1)

MULTICHANNEL INCORRECT COMMUNICATION SYSTEM by ed. St. No. 1210229, characterized in that, in order to increase the noise immunity of the communication, an adder modulo two is introduced on the transmitting side, the inputs of which are combined with the information inputs of the switches, the adder modulo two output is connected to the second input of the phase difference manipulator, and an additional unit is introduced on the receiving side comparison and a decision block, the inputs of which are connected to the outputs of the phase difference decoder and channel shapers, the inputs of which are combined with the corresponding inputs of the additional comparison block, the output It is connected to the control input of the decision block. e SU „, 1403385 A2