SU1501293A1 - Radio communication system with pseudorandom signals - Google Patents

Abstract

The invention relates to telecommunications. The purpose of the invention is to increase the noise immunity of the transmission of analog information. The radio communication system on the transmitting side multipliers 1.3 and 11, transmitter 2 radio signals, clock and carrier frequency generators 4 and 6, phase shifter 5, adder 7, signal limiter 8, synchronizer 9 and pseudo-random sequence generator 10 on the receiving side - radio signal receiver 12, synchronizer 13, delay tracking unit 14, multipliers 15,16,24 and 25, low pass filters 17,23 and 26, accumulator 18, threshold unit 19, allocation units 20 and 27 discrete and analog information, phase shifter 21 and controlled gene Rathore 22 and the sources 28 and 29 analog and discrete data. The radio system is designed for the combined transmission of discrete and analogue modulation of the bandwidth delay. At the receiving side, by demodulating the signals, the transmitted message is received at two points depending on the modulation method. The discrete information signal is extracted at the output of the filter 17, and the analog information signal is output at the multiplier 24. 1 sludge.

Description

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The invention relates to telecommunications and can be used in radio communication systems, in KOTOpiiix using pseudo-irradiating signals, simultaneous nc-pevt-tqa signals of analog and discrete information are possible.

 invention - improving the noise immunity of the transmission of analog information.

The drawing shows a structural electrical circuit of the proposed radio communication system with pseudo-random signals.

The radio system with pseudo-random signals contains on the transmitting side multiplier 1, transmitter 2 radio signals, first additional multiplier 3, generator 4 clock frequency, phase shifter 5, generator 6 carrier frequency, adder 7, limiter 8 on the signal level, syncro P1 regulator 9, generator 10 pseudo-random nose (PSP), the second additional multiplier 11, on the reception-} the 1st side - the receiver of 12 radio signals, the synchronizer 13, the delay tracking unit 14, the multiplier 15, the first additional signal 16, first additional low-pass filter 17 (LPF), 11a1 support 18, threshold unit 19, discrete information extraction unit 20, phase rotator 21, controlled oscillator 22, low-pass filter 23 (LPF), second additional multiplier 24, third additional multiplier 25. second additional low-pass filter 26 (FIM), block 27 of analog information. The source also presents an analog information source 28 and 29 discrete information sources,

Radio communication system with pseudo-random signals works as follows.

A radio system with pseudorandom signals is designed for the combined transmission of discrete and analog information. The carrier of information is a pseudo-random sequence. Broadcast

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Analog information arrives at the second input of the nerves about the additional multiplier 3 of the transmitting side, at the first pass, comes to the armature voltage carrier frequency from the generator 6, shifted by the JC factor by 90 by the phase shifter 5. (from the output of the source 29 discrete information through the synchronizer 9 enters the second dog-cell, the I multiplier 1 1, where it is multiplied with a signal with a frequency of three frequencies. The synchronizer binds the discrete information symbols temporarily, i.e. the symbol is discrete This information is synchronized with the SRP, Signal) from the outputs of the first and second additional multipliers 3 and 1I are fed to the adder 7. Next, the total signal is limited by 44gitzp ode to the limiter 8 and fed to the second input of the alternating signal Tol 1, to the first input of which the PNG is output from the generator output 10. Next, the signal from the output of the transistor tel 1 is input to the non-transducer 2.

On the receiving side, the signal from the output of receiver 12 is connected to the combined inputs of the multiplier 15 and b. To the delay tracking current 14. The HbLM footing by the voltage of the 15 v-g commutator voltage is generated by the delay tracking unit 14. The signal from the output of the var; the whale 15 enters the “stroke of the demodulator containing the first, second and third additional ones; spinner 21.

This demodulator allows to receive a transmitted message at two points depending on the modulation method. The discrete information signal E is emitted at the output of the first additional low-pass filter 17, and the analog information signal is output at the second additional multiplier 24. The filtered signal of discrete information from the output of the first additional low-pass filter 17 is fed to the inputs of accumulator 18, the threshold block 19 and

the discrete information is carried out by the gc of the discrete information extraction unit 20 by means of the inverse monopulation of the pseudo-random sequence and the sequence bandwidth and the analogue modulation of the memory bandwidth by delay. Source 28 output

matsii. The synchronizer 13 determines the reset points of the accumulator 18 and the threshold unit 19 determined by the repetition period of the discrete information.

discrete information extraction unit 20. The synchronizer 13 determines the instants of the reset of the accumulator 18 and the threshold unit 19 determined by the repetition period of the discrete information.

The signals from the output of the second additional multiplier 24 are fed to the analog information extraction unit 27.

Claims (1)

Invention Formula Radio communication system with pseudogap signals, containing on the transmitting side serially connected pseudo-random sequence generator, multiplier and transmitter of radio signals, serially connected clock frequency generator and synchronizer, after- ((iB is the main signal of the signal accumulator and limiter on the signal level, on the receiving side - sequentially connected radio receiver, delay tracking unit, synchronizer, accumulator, threshold unit and discrete information blocking after mutually connected low-pass filter and controlled oscillator, as well as an analog information extraction unit and a multiplier, the first and second inputs of which are connected respectively to the output of the radio signal receiver and the output of the reference signal of the delay tracking unit, and the clock input of the threshold unit is connected to the synchronizer output, the second input of the transmitter of the transmitting side, the output of the radio signal transmitter and the input of the radio signal receiver are respectively the input signal of the discrete information, the output of the radio signal and the radio signal input of the system, characterized in that, in order to improve the noise immunity of the transmission of analog information, serially connected carrier oscillators are introduced on the transmitting side 0 five frequency, phase shifter and the first additional multiplier, as well as the second additional multiplier, the first input of which is connected to the output of the carrier frequency generator, while the first and second inputs of the adder are connected respectively to the outputs of the first additional multiplier and the second additional multiplier, the second input of which is connected to the synchronizer output and the input of the pseudo-random sequence generator and the second input of the multiplier are connected respectively to the outputs of the clock frequency generator and a signal limiter, the second input of the first additional multiplier is the input signal of the analog information of the system, the first additional multiplier is sequentially connected at the receiving side, the first additional low-pass filter 5 and the second additional multiplier whose output is connected to the combined inputs a low-pass filter and an analog information extraction block, a sequentially connected 0 phase shifter, a third additional multiplier, and a second additional An optional low-pass filter whose output is connected to the second input of the second additional multiplier, while the output of the controlled oscillator is connected to the inputs of the phase shifter and the first additional multiplier, the second input of which is combined with the second input of the third additional multiplier and connected to the output of the multiplier, and the information input of the accumulator connected to the output of the first additional low-pass filter. five 0