SU1635275A1 - Radio link with amplitude-and-phase manipulated noise- like signals - Google Patents

Abstract

The invention relates to a radio communication technique and can be used in the construction of digital radio information transmission systems operating under conditions of uncertain interference. The purpose of the invention

Description

The invention relates to a radio communication technique and can be used in the construction of digital radio information transmission systems operating in conditions of uncertain fields.

The aim of the invention is to improve noise immunity when exposed to interference with limited average power.

The drawing shows a structural electrical circuit of a radio link.

Radio line contains on the transmitting side information source 1, phase modulator 2, modulator 3, amplifier 4, power amplifier 5, transmitting antenna 6, carrier frequency generator 7, synchronization unit 8, pseudo-random sequence generator 9, shift register 10, storage register 11 decoder 12, digital-to-analog converter 13, and on the receiving side — receiving antenna 14, mixer 15, intermediate frequency amplifier 16, multiplier 17, amplifier 18, integrator 19, decisive block 20, information receiver 21, local oscillator 22, block 23 si synchronization, 24 pseudo-random sequence generator, shift register 25, storage register 26, decoder 27, digital-to-analog converter 28.

Radiolines with amplitude-phase-manipulated noise-like signals operate as follows.

In the transmitting part of the source 1 information is a sequence of two

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of various characters 1 and 0 with a speed P tg (T is the duration of information packages) is fed to the input of the phase modulator 2. From the pseudo-random sequence generator (CST) from the (p-H) th output of the storage register 11 to the second input of the phase modulator 2 enters binary sig / vt

cash lasting from - where N

number of pulses. Follow up period

pulses at the output of GSPP 9 is equal to l.

C0 (n - the whole chiglo). The signals from the first output of the synchronization unit 8, the follow-up period of which is 6, the sequence of binary pulses from the output of the GPS device 9 is recorded in the shift register 10, and then the signals from the second output of the synchronization unit 8, followed by

frequency f - - in the register 11 store

nothing From the first output of the register, 11 n bits of the binary random number a are fed to the n inputs of the decoder 12. On the n outputs of the decoder 12, an n-bit binary number equal to the value of one of the m pseudo-random amplitudes corresponding to the number of the section in which . . gives a random number, r. A digital-to-analog converter (D / A converter) 13 converts an input binary combination into an analog signal, corresponding to 5

one of the m pseudo-random amplitudes. From the PAP 13 output, the signal arrives at the control input of the amplifier 4. The synchronization unit 8 forms two pulse sequences with frequencies f and (n + 1) f. The PSS video sequence carrying information symbols enters the modulator 3, in which the phase modulation of the carrier wave arriving at the other input of the modulator 3 from the carrier frequency generator 7 is carried out. The phase-like noise-like signal from the output of the modulator 3 is fed to the input of amplifier 4, the gain factor of which changes according to the signal level at the control input. From the output of amplifier 4, the PSS is fed to the input of power amplifier 5, where it is amplified to the required level. then, via transmitter antenna 6, is radiated into space.

In the receiving part of the radio link, the signal received by the receiving antenna 14 passes through the mixer 15, is transferred via the local oscillator 22 to the intermediate frequency, amplified in the intermediate frequency amplifier (AM amplifier) 16. From the IF amplifier output 16, the signal goes to the multiplier 17, to the second input of which as a reference, the signal from HLG1 24 is sent through the (n + 1) -th output of the storage register 26. The result of multiplying the input and reference signals is fed to the amplifier 18, the gain factor of which depends on the level of the signal fed to the control input of the amplifier 18 from the output of 11AP 28. The signal at the output of the D / A converter 28 is generated using the GPSP 24, shift register 25, register 26 storage, block 23 synchronization. decoder 27 is similar to the formation of the signal at the output of the PAP I. From the output of the amplifier 18, the signal goes to the integrator 19 and then to the block 23 of the synchronization and the decision block 20. The block 23 of the synchronization forms two successors pulses with frequencies f and (n − t 1) f, controls the operation mode of decision block 20 and searches for the AFM PSS signal by frequency and time. To search for AFM ShPS in frequency, the synchronization unit 23 rearranges the local oscillator 22. After the termination of the PD6352756

ska and synchronicity at the output of the decisive block 20 show up (with the information sequence in the form of binary symbols, which is transmitted to the block 21 of the recipient of information.

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Claims (1)

Invention Formula Radiolines with amplitude phasgma impugnated noise-like signals, containing on the transmitting side, Consequently, a connected information source, a phase modulator and a modulator, serially connected synchronization unit and a pseudo-random sequence generator, a power amplifier whose output is connected to a transmitting antenna, and a carrier frequency generator whose output is connected to the second input of the modulator, and on the receiving side - serially connected receiving antenna, mixer and amplifier are frequency, serially connected synchronization unit and the local oscillator, the output of which is connected to the second input of the mixer, serially connected decisive unit and information recipient unit, and the second output of the synchronization unit connected to the clock input of the decisive unit, the fact that, in order to increase noise immunity when exposed to interference with limited average power, serially connected shift register, storage register, decoder, digital-to-analog conversion are introduced on the transmitting side The tel and amplifier, the pseudo-random sequence generator and the synchronization unit outputs are connected to the informational and tact inputs of the shift register respectively, the second output of the synchronization unit is connected to the clock input of the snoring register, the second output of which is connected to the second input of the phase modulator, the output of the modulator is connected to the second the input of the amplifier, the output of which is connected to the input of the power amplifier, and serially connected multiplier, amplifier and integrator are inputted at the receiving side; Secondly, it is connected to the information input of the decision block and to the input of the synchronization block and a pseudo-random sequence generator connected in series, 716352758 shift register, storage register, de-keys to the generator input pseudo-encoder and digital-to-analog converter-random sequence and to the driver, the output of which is connected to the shift input of the shift register, and the fourth-second input of the amplifier, the output is the output of the synchronization unit of the coupling device the intermediate frequency is connected to the clock input of the register with the first input of the multiplier, trending, the second output of which is the sub output of the synchronization block of the sub-keys to the second input of the multiplier.