SU1197113A2 - Device for statistical detection of discrete signals in communication channels with intersymbol interference - Google Patents

Abstract

DEVICE FOR MOTION OF STATISTICAL DETECTION OF DISCRETE SIGNALS IN THE CHANNELS OF COMMUNICATION WITH INTERSYMWARE INTERFERENCE on auth.St. IP 754687, which is so that, in order to increase noise immunity by reducing the dependence of the frequency of correct regeneration of discrete signals on the intensity of non-stationary interference in the communication channel, a comparator with an adjustable gain factor is introduced into it and a series-connected amplifier with a constant gain factor, a key, an additional adder and a comparison unit, with the additional output of the receiver of continuous signals connected to the detector input of quality signals a power amplifier with adjustable gain, the signal and control inputs and the output of which are connected respectively to the amplifier input with a constant gain, the output of the comparator unit and the combined second input of the comparator unit, second (Additional input of the additional accumulator and comparator input, output which is connected to the control input of the key.

Description

 one

The invention relates to telecommunications, can be used in receivers of data transmission systems, monitoring and control, and is an improvement of the device by author. No. 754687..

The goal of the invention is to increase noise immunity by reducing the dependence of the probability of correct regeneration of discrete signals on the intensity of non-stationary noise in the link.

The drawing shows the structural electrical circuit of the proposed device. A device for statistically detecting discrete signals in communication channels with intersymbol interference contains receiver 1 continuous. signals, adder 2, re: shaving unit 3, regenerator 4yy -ary signals, shaper 5 hypothetical sequence, unit 6 adders modulo t, generator 7 of suspected errors, multiplier 8 to the ratio of noise residues, summing unit 9, block 10 delay, detector II quality t-ary signals, shaper 12 erase sequence, amplifier 13 with adjustable gain, comparator 14, amplifier 15 with constant gain, key 16, additional adder 17, block 18 comparison.

The device works as follows.

The received oscillations from the additional output of receiver 1 of continuous signals arrive at the input of adder 2. and the signal input of amplifier 13 with an adjustable 1m gain, where it is amplified (multiplied / and fed to comparator 14, dd, the obtained product is compared with zero. the comparator 14 controls the clause 16, allowing the signal from the output of the amplifier 15 to pass with a constant usnleri factor either inversely or non-invertedly, i.e. determines the sign of the product at the output of the amplifier 15. The resulting th signal and the output signal of the amplifier 13c variable gain received on the first and second inputs of the additional adder 17, the output of which in za1132

depending on the sign of the product at the output of the amplifier I5, a difference is obtained or the sum that arrives at the input of the comparator unit 18, where it is compared with the signal at its second input from the output of the amplifier 13 with an adjustable gain factor. The voltage at the output of block 18 adjusts the gain of amplifier 13, from the output of which already corrected signals are fed to the inputs of the signal regenerator - and detector 11 of quality w-ary signals, from the outputs of which signals with a manipulation speed V are written to the hypothetical sequence generator 5 and shaper 12 erase sequences, which are shift registers of length L equal to the channel memory interval. From the output of the imager 5.g.-potetic sequence, the signals are sent to one group of inputs of the block 6 modulo m adders, to another group of inputs of which signals are received from the generator 7 of alleged errors with a speed of VL, and the third group of inputs receives signals from the generator of the 12th sequence erasures, which during the reception of one character, ensures the formation at the output of block 6 adders modulo hi. sets of CHMBOJIOB combinations taking into account the assumed and anomalous errors on the channel memory interval. The signals from the output of block 6 adders modulo m are fed to the inputs of the multiplier 8 on the coefficients of the noise residues. The result of multiplying interfering noise residues. from the next and subsequent symbols to the output from the multiplier 8 to the coefficients, the noise residuals are fed to the subtracting input of the adder 2, the summing input of which receives a continuous signal from the receiver 1 of the continuous signals through the delay unit 10 by one symbol. The signal from the output of adder 2 is analyzed in decision block 3 on a memory interval, and then a decision is made on the transmitted symbol

Thus, by implementing a learning procedure with aligned

3h197g 13 L

Errors are corrected. Signal radios and, therefore, errors, thereby significantly reducing noise immunity, the probability of erroneous regeneration as a whole is reduced.

Claims (1)

DEVICE FOR STATISTIC DETECTION OF DISCRETE SIGNALS IN CHANNELS FOR COMMUNICATION WITH INTERCHARGE INTERFERENCE by ed. 1? 754687, with the exception that in order to increase. noise immunity by reducing the dependence of the probability of correct regeneration of discrete signals on the intensity of non-stationary interference in the communication channel, a comparator, an amplifier with an adjustable gain and serially connected amplifier with a constant gain, a key, an additional adder and a comparison unit are introduced, while the receiver has an additional output signal is connected to the input of the detector of high-quality signals through an amplifier with adjustable gain, the signal ny and control inputs and output of which are respectively connected to the input of an amplifier with constant gain, the output of comparator unit and the combined second input of the comparator, the second input of the adder and an additional input of the comparator, whose output is connected to the control input of the key. SU. „1197113