SU769748A1 - Adaptive corrector - Google Patents

Description

one

The invention relies on telecommunications technology and may be used in data communications to correct signals with any kind of modulation.

Known adantive corrector containing the first and second multipliers, the first inputs of which are combined, and the outputs, respectively, through the first and second filters are connected respectively to the first and second inputs of the analog-to-digital converter, the first and second outputs of which are connected to the inputs, respectively, of the first and second lines delays n branches each, 2p in-phase attenuators and 2p attenuators of quadrature subchannels, the outputs of which are connected to the corresponding inputs of the first and second adders, n correlators synphase subchannel, the outputs of which are connected to the control inputs of the corresponding attenuators of the in-phase subchannel; , the output of which is connected to the control inputs of the analog-to-ni-nary preobrazovatelen n nerve and the second delay lines, as well as the detector, onopiibix source signal fishing, the subtraction unit and 1.

However, the well-known adaptive corrector does not provide a correction for the link channel with increased linear distortion.

The purpose of the invention is to provide a secure communication channel with increased linear searches.

To do this, an adaptive equalizer containing the first and the second multipliers, the first ;; whose strokes are combined,.: The outputs correspond to the first through the second filter; connected with (first branch; first L and first pore inputs of ana-hue and figurative mode: agel, ierv: and the second outputs of which are connected to the inputs, respectively, of the first and second delay lines with n taps each, 2; i

in-phase attenuators and 2 quadrature subchannel attenuators, the outputs of which are connected to the corresponding inputs of the first and second adders, n KO; Irel of the common-mode subchannel output, output;

25 KOTOp- and the second non-communicators, a block of clock signals, the output of which is connected to the control inputs of the analog-digital converter and the first and second delay lines, as well as a detector, a source of reference signals, an addition unit and a subtraction unit and, n subdivision subtraction blocks were introduced, each of the taps of the first and second delay lines connected to the signal input of the corresponding phase channel subchannel, the signal input of the corresponding quadrature subchannel attenuator and one of the inputs of the corresponding additional subtractor whose output is connected to the first inputs of the corresponding correl in-phase and quadrature sub-channel tori; combined second inputs; in-phase sub-channel correlator tori; and combined second inputs; The quadrature subchannels are connected respectively to the output of the addition unit and to the output of the subtraction unit, the first and second inputs of which are connected respectively to the first and second inputs of the addition unit and to the first and second outputs of the detector, the first, second, third, fourth and fifth inputs connected respectively to the first and second outputs of the source of reference signals, the outputs of the first and second adders and the output of the clock signal block, the first and second inputs of which are connected to the outputs of the first, respectively second filters and the first, second, and third input signals oiornyh unit connected respectively to the outputs Hierve and second adders and the block clock signals. The drawing shows a structural electrical circuit of the proposed corrector.

The adaptive equalizer contains first and second multipliers 1, 2, first and second filters 3, 4, analog-to-digital converter 5, first and second delay lines 6, 7 with n taps, 2n attenuators 8 in-phase subchannel, 2n attenuators 9 quadrature drip, first and second adders 10, I, p correlators of the 12 in-phase subchannel, p correlators of the 13 quadrature channel, block 14 of reference signals, block 15 of clock signals, detector 16, source 17 of reference signals, block 18 of addition, block 19 of subtraction, l, additional blocks 20 subtracted

Adaptive corrector works as follows.

The algorithm of the corrector is characterized by eating UPI mi expressions:

C6, (i Н) - a, (i) --Д «V. / :; (/, „) I +, Ci,“), p), “);

) P (i) ApV | (/, p) (:;, p) h, (i, n) + gk (ji, n);

de a,; (i + l) and a ,, (i) are the transmission coefficients of the attenuators switched on at the k tom of the in-phase subchannel delay line on the (i-f 1) -m n i-OM, respectively;

Ace — magnitude variations in the transmission coefficient of the in-phase subchannel attenuator at one iteration (the magnitude of the adjustment ring);

k is the number of the retraction of the delay line, counted from the beginning of the delay line;

l is the iomer of the unit interval after the i-ro step of the adjustment;

N is the number of unit intervals on the time interval between the i-M and (i + l) -M trim points;

Es (i, n) - the deviation of the projection of the vector

npHHWMaeMoro signal per axis Y from the reference value of the nodes at the output of the 1st adder in the middle of the / rth significant interval;

EC (1) P) is the deviation of the projection of the vector of the received signal on the X axis from the reference value y c at the output of the 2nd adder in the middle of the lth significant interval.

h, v (i, n) is the value of the projection of the received signal at the k-th branch of the delay line on the X-axis in the middle of the n -th significant interval;

g, (i, n) is the value of the projection of the received signal at the k-th outlet of the delay line on the Y axis in the middle of the n-th significant interval;

/ i () 51 P /; (i) is the value of the transfer coefficients of the quadrature subchannel attenuators connected to the k-t tap of the delay lines, respectively, carrying (i-M) -ro and i-ro tuning pins.

Claims (1)

1. Guidoux L. Eglisenr autoadaptatifa double echantillonnage. Applique ala transmission de donnees a 9600 bitt / seconde, Zonde electrique, co1. 55, No. 1, Januer, 1975, p. 9-13 (prototype).