SU936441A1 - Adaptive corrector of intersymbol signal distortions - Google Patents

Description

one

The invention relates to communications and can be used to eliminate intersymbol distortions in the received signal.

Known adaptive corrector intersymbol distortion signal c. A partial response containing a harmonic equalizer that consists of an analog sectioned delay line, each of (the taps of which, except the center one, are connected to one at the inputs of the corresponding attenuation controller, the outputs of which and the central tap of the analog sectioned delay line war 15 are connected to the inputs of the adder, the regenerator, the input of which is connected to the output of the adder and the input of the subtractor unit, the other input of which is connected to the output of the regenerator, the output of the subtractive unit is connected to the delay signal line of the error, each of (h - K) taps of which and the output of the delay line of the main signal are connected to the inputs of the corresponding

multiplier, the output of which through the blocking device, prohibiting the output of the control signal when the main signal, zero or the same polarity of the control signal at the output of the adjacent multiplier arrives, is connected via an integrator to the U1 of the corresponding input

hum damping ft.

However, the known corrector has a relatively low accuracy and considerable tuning time.

The purpose of the invention is to improve the accuracy and reduce the adjustment time of the adaptive equalizer.

The goal is achieved by the fact that the adaptive corrector of intersymbol distortion of the signal from the pa (chdalnye response containing a harmonic corrector, which consists of an analog sectioned delay line, each of the cat taps (i, except the central one, is connected to one of the inputs of the corresponding attenuation controller, the outlets 393 of which and the central outlet of the analogous section of the checkpoint are connected to the accumulator adder, the regenerator, which is connected to the output of the adder and the input of the subtraction unit, the other in the stroke of which is connected to the regenerator vykod, the output of the subtracting unit is connected to the input delay line of the error signal, each of which (h + tl) taps and the output of the delay line of the main signal are connected to the inputs of the corresponding multiply l, the output of each integrator is connected to a) to the INPUT circuit of the corresponding damping controller, a switch coder, f additional adders, VI logical inverters are entered, the regenerator output is connected through the converter to the input of the main signal delay line, the output of each from (P + 1) the multipliers are connected to the input of the corresponding additional adder directly and through one of the logical inverters to the input of the other corresponding secondary adder, the output of each of which is connected to the input of the corresponding integrator (the value of 1c depends on the type of the binary signal ). The drawing shows the structural cjiBMa of the proposed corrector. The adaptive intersymbol distortion corrector of a sypnal contains harmonic corrector 1, consisting of analog sectional delay line (ASLZ) 2, divided into elements 3, damping regulators 4 and adder 5, regenerator 6, integrators 7, K - logical inverters 8, subtracting block 9, Liupo 10 delay of the error signal, divided into G1 elements, multipliers 12, recoding device 13, delay line 14 of the main, signal and Vi supplementary adders 15, Adaptive equalizer work as follows (on a bi-pulse signal 2-g about class). It is a simple pulsed form. The signal is fed to the input of an analogue secionated delay line 2, consisting of elements 3. The TERMINAL 2 taps are connected to an adder 5, whose output is a harmonic equalizer 1 output. Corrected from the adder 5 post, first of regeneration 6 and further at the output of the adaptive equalizer, and secondly, at one of the inputs of the subtractive unit 9, where the error signal is generated, the resulting signal is received. 1 as the difference between the real and the regenerated signal from the regenerator 6. The error signal from the output of the subtracting unit 9 is fed to the input of the line 10 Eaern, which is from Ashmvnt 11, whose taps are connected to the inputs of the multipliers (tfr) 12. To tspynae The inputs of transducer 12 come from the recorder 6 recoded in recoded 13 and delayed using lx delay by an amount equal to half the value of the delay of the Yu zatzgrzhmi line, a binary signal corresponding to the conditional bi-momentum of the original signal. In the multiplication-multiplication operation on the outputs of multipliers 12, the signal values corresponding to the deviation of the impulse response of the channel to the biopulse effect appear, Pthz, since the main signal value in the considered problem is a different polarity biopulse, the change in attenuation of a certain regulator 4 is produced only if the corresponding value of the pair of multipliers 12 has iviecTo the value of the applied voltage. The direction of movement of the regulator 4 is determined by the conditional polarity of the original biopulse, for which a resolution is calculated with the character of the detected skew. In this case, the intensity of the displacement is regulated by 4, the greater, the greater the magnitude of this bias. Determination of the value and magnitude of the skew of the reaction reaction values is carried out by adders 15, nptv and distorting the pairwise addition of signals from multipliers 12, with the previously passed signal passing through the logical inverter 8. Signals from the output of adders 15 after averaging by the integrators 7 arrive at the control inputs of the regulators 4. If the pair of adjacent response response values is the same in magnitude, there is no control signal at the output of the corresponding integrator 7. If the pair is skewed, then a certain control signal appears at the output of the corresponding integrator 7, which accordingly changes the attenuation coefficient of the regulator 4. The proposed adaptive equalizer provides a high quality of correction, which allows reducing the labor-intensive volume complex in the setup of the equipment of the preliminary formula of the invention

Adaptive rc intermicrobial distortions of the signal with a partial response, sotshayuschy harmonic corrector, which consists of an analogue-connected back-up line, each of which taps, except the central one, and one of the inputs of the corresponding decay regulator, you alone central drainage

 sectioning the delay line 1 to 2 to the inputs of the adder, a regenerator, the input of which is connected to the output of the adder on the input of the subtractor

/ block, the drdggy input of which is connected to the regenerator output, the output of the subtracting block is connected to the input of the alternate error signal, each from

: (U1 1 () which taps and line output

 connection of the suspicious signal podkl ac "1Y to the inputs of the corresponding transnomshte l output of each integrator podklk

a check to the control input of the corresponding damping controller that differs in that, in order to improve the accuracy and time, by adjusting the adaptive equalizer, a re-codeback, and a pop-up; an adder, N logic shshertor, while the output of the regis- trarr is connected to the input signal delay line of the main signal, the output of each (and - ft) is connected to the BXofV of the corresponding additional adder directly and through one of the VI logical inputs to the input to the socket of the secondary adder additional summEgor, the output of each of which is connected to the input of the corresponding integral integrator. Have

Sources of information taken into account by the expert

1. Pateit USA Nt 3508153 I. cl. 325-42, op5gblik. 197O (prototype).

Claims (1)

Claim An adaptive intersymbol distortion signal corrector with a partial ogkdek containing a harmonic corrector, which consists of an analog sectioned delay line, each. from And the bends of which, except for the central one, are connected to one of the inputs of the corresponding attenuation controller, the outputs-> 0 of which and the central branch of the analog sectioned delay line are connected to the inputs of the adder, the regenerator whose input is connected to the output of the adder and the input of the subtracting I block, - the other input of which is connected to the output of the regenerator, the output of the subtracting unit is connected to the input of the delay line of the error signal, each of (H + 1Q taps of which the output of the line • delays of the main signal are connected to the inputs of the multiplier, the output of each integrator is> 936441 connected to the control input of the corresponding attenuation controller, characterized in that, in order to increase the accuracy and reduce the tuning time of the adaptive corrector, an encoder, AND additional; adders, - and logical inverters are introduced, while the regenerator output is connected via a decoder to the input of the delay line of the main signal, the output of each of (and + fc) removers is connected to the input of the corresponding additional adder directly and through in. from AND logical inverters - to the input 15 of another corresponding additional adder, the output of each of which is connected to the input of the corresponding integrator. .