SU1172029A2 - Adaptive corrector of intersymbol distortions of signal - Google Patents

Abstract

ADAPTIVE CORRECTOR OF INTERSIGNAL DISTORTIONS OF SIGNAL, by author. St. No. 936441, characterized in that, in order to improve the half-resistance of receiving signals with a partial response, a delay element and a series-connected rectifier, a second adder, an additional subtraction unit, an AND element and a switch, the second input of which is connected to the outputs of the first adder, are introduced into it, and the output is the output of the adaptive intersymbol signal distortion corrector, with STONJ, the regenerator output is connected to the rectifier and to the second input of the AND element, and the output of the second adder is connected via the delay element to the second input of the additional subtraction unit and to the second input of the second adder. (L o o y: o

Description

The invention relates to communication technology and can be used to eliminate intersymbol distortions in the receiving signal.

The purpose of the invention is to increase the noise immunity of receiving signals with a partial response.

The drawing shows a structural diagram of a device adaptive corrector intersymbol distortions of the signal.

The device contains a harmonic corrector 1, an analog sectioned delay line 2, divided into elements 3, attenuation controllers 4, a first adder 5, a regenerator 6, integrators 7, logic inverters 8, a subtracting unit 9, an error signal delay line 10, divided into elements 11 , multipliers 12, transcoder 13, main signal delay line 14, η additional adders 15, second adder 16, delay element 17, additional subtraction unit 18, element And 19, switch 20, rectifier 21.

A partial response signal is generated on the transmission as follows: bj = c ί + bi-i, aj = ^b i-bj-i, where {Cc is the sequence of transmitted independent equiprobable characters “0” and “1” received at the input of the device’s transmitter signal conversion.

Adaptive corrector works as follows.

The bi-pulse demodulated signal is fed to the analog sectioned delay line 2. Passing through it and the attenuation controllers 4, the signal components are fed to the input of the adder 5. At the output of the adder 5, a corrected signal is generated. This corrected signal is fed to the regenerator 6, where it is evaluated, and to the subtracting unit 9. At the output of the subtracting unit 9, an error signal is generated, which is the difference between the corrected signal at the output of the first adder 5 and the regenerated signal. The error signal is sent to the error signal delay line 10, the taps of which are connected to the inputs of the multipliers 12. The signal from the output of the regenerator 6, deformed in the transcoder 13 and delayed in the delay line 14 of the main signal, is received at the other inputs of the multipliers 12. η is carried out by additional adders 15, producing pairwise addition of signals from the multipliers 12, with the previously transmitted signal going through to the logical inverters 8. The signals from ode η additional adders 15 after averaging integrator 7 are connected to control inputs of the regulators 4 damping. As a result of the operation of multiplication at the outputs of the multipliers 12 there are reference values of the signal corresponding to the pulse response of the channel to the action in the form of a bi-pulse. Since the main reference value of the signal is a bi-pulse of different polarities, the attenuation of a certain attenuation controller 4 is changed only if the output of the corresponding pair of neighboring multipliers 12 is skewed.

Under the influence of impulse noise occurring in communication channels, or other interfering factors, single erroneous elements of the corrected signal appear at the output of adder 5. Some erroneous values of the corrected signal can be detected and corrected using the properties of bi-pulse signals.

The rectifier 21 in conjunction with the second adder 16, the delay element 17, the additional subtraction unit 18, the element And 19 and the switch 20 form a node that implements the correction of single characters.

From the sequence of evaluating the signal at the output of the regenerator 6 by rectification at the output of the rectifier 21, a sequence of the initial signal with possible errors is formed. Using the second adder 16, the delay element 17 and the additional unit 18 of subtraction by formula (1) from the obtained sequence of the original signal with possible errors, a new sequence of bi-pulse signals is generated. The signals from the outputs of the regenerator 6 and the additional unit 18 subtraction are compared in the element And 19.

If these signals do not match, then the analyzed sequence element at the output of the regenerator 6 is erroneous and must be corrected by inverting the signal from the output of the adder 5. This operation is performed by the switch 20. If the signals at the inputs of the element And 19 match, then the signal from the output of the adder 5 occurs on adaptive corrector output unchanged.

Claims (1)

ADAPTIVE CORRECTOR OF INTER-CHARGE SIGNAL DISTORTIONS, by author. St. No. 936441, characterized in that, in order to increase the noise immunity of receiving signals with a partial response, a delay element and a rectifier connected in series, a second adder, an additional subtraction unit, an I element and a switch, the second input of which is connected to the output of the first adder, are introduced into it, and the output is the output of the adaptive corrector of intersymbol distortions of the signal, while the output of the regenerator is connected to the rectifier and to the second input of the And element, and the output of the second adder through the delay element is connected to the W the second input of the additional subtraction unit and to the second input of the second adder.