SU731603A1 - Pseudonoise signal compressing device - Google Patents

Description

information signals, serially connected decoder and additional phase manipulator, the second input and output of which are connected respectively to the additional output of the oscillator carrier and clock frequencies and the second inputs of the multipliers, and the additional outputs of the corresponding generator of orthogonal pseudorandom sequences are connected to the inputs of the decoder, and the third input of the additional phase shift keyer has an information signal.

The drawing shows a structural electrical circuit of the device.

The device contains a carrier and clock oscillations generator 1, orthogonal pseudo-random sequence oscillators 2 and 3, phase manipulators 4, 5, multipliers 6 and 7, adder 8, keys 9 and 10, block 11 matches, block 12 matches, counter 13 to n +1 impulse, additional phase handler 14 and decoder 15 per l-bit combination.

The device works as follows.

Oscillator 1 generates two frequencies: the clock frequency for oscillators 2 and 3 and the carrier frequency of the signal. The clock frequency signal from the output of the generator 1 simultaneously arrives at generators 2 and 3, generating binary orthogonal pseudo-random sequences, which from the outputs of generators 2 and 3 arrive at phase manipulators 4 and 5, respectively.

The signal of the carrier frequency from the output of the generator 1 is fed to the input of the phase manipulator 14, the second input of which receives information signals. At the output of the phase manipulator 14, signals are formed representing the oscillations of the carrier frequency with a constant amplitude, manipulated in phase by 0 and 180 ° according to the law of information signals. In this case, the manipulation frequency is synchronized by cyclic signals taken from the output of the decoder 15. From the output of the phase manipulator 14, signals are fed to the second inputs of multipliers b and 7.

In phase manipulators 4 and 5, manipulation is performed according to the law of binary pseudo-random sequences in accordance with the signs of information binary signals. Manipulated two. Pseudorandom sequences from the outputs of phase manipulators 4 and 5 are fed to multipliers 6 and 7 and to blocks 11 and 12 coincidence. Signals are formed at the output of multipliers .6 and 7.

are oscillations of a carrier frequency with a constant amplitude, mapped by phase O and 180 according to the laws of binary sequences during their periods and manipulated in phase by 0 and 1-80 ° from period to period of pseudo-random randomness according to the law of information signals.

From the output of multipliers 6 and 7 signals

served on keys 9 and 10 respectively

the outputs of which are connected to the adder

8. The output signal from block 11 controls key 10 and opens it in case of coincidence of pulses at the input of block I.

The output signal from the coincidence unit 12 is fed to the counter 13, and the output signals from the counter 13 with l-consecutive pulses at its input pass to the second control input of the key 10, and with n + 1

pulse - to control key input

9. As a result, only one of the keys 9 or 10 is always open, and the adder 8 receives the sigal from only one multiplier 7 or 6, respectively.

The degree of compression of information in the device is enhanced while ensuring the interference immunity of transmission by using the carrier phase as a modulated parameter to display information signals on it.

Claims (1)

Invention Formula A device for compacting pseudo-noise signals, containing a carrier and clock oscillator, the output of which is connected to the inputs of orthogonal pseudo-random sequence generators, the outputs of which are connected to the first inputs of multipliers, the outputs of which are connected respectively to the first inputs of keys, whose outputs are connected to the inputs of the adder, while the outputs of the phase manipulators are connected to the inputs of the matching blocks, the outputs of which are connected respectively to the input of the counter and the second input of the first key, to the third input of which the first is connected the output of the counter, the second output of which is connected to the second input of the second key, and information signals are sent to the corresponding inputs of the phase manipulators, characterized in that, in order to increase the efficiency of compaction, sequentially connected decoder and additional phase manipulator are introduced, the second input and output of which connected respectively with an additional output of the oscillator carrier and clock frequencies and the second inputs of the multipliers, and additional outputs the corresponding generator of orthogonal pseudo-random sequences is connected to the inputs of the decoder, and an information signal is sent to the third input of the additional phase shift key. Sources of information taken into account in the examination of the USSR 1. USSR author's certificate No. 526081, cl. H 04J 1/00, 1975 (prototype).