SU1297240A1 - Device for estimating parameters of communication channel - Google Patents

Abstract

This invention relates to radio. The purpose of the invention is to increase the accuracy of the assessment. The device contains an input signal splitter 1, a decision block 2, an M-branch delay line 3, a shift register 6, M averaging filters 10. On the left, M averages forming units 9, M weight functions 8 units and successively connected equalizer 4 are entered intersymbol distortions, data preparation block 5 and computing unit 7. 1 pc. (L N5 SO yu 4 O

Description

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The invention relates to radio communications and is intended for use in discrete message transmission systems via communication channels with the energy dissipation of received signals in time and frequency, for example, in a decamer channel.

The purpose of the invention is to increase the accuracy of evaluation.

The drawing shows the functional electrical circuit of the device.

The device for estimating communication channel parameters contains an input signal splitter 1, a decision block 2, an M-branch line 3 delays, an intersymbol distortionator 4, a data preparation unit, a shift register 6, a computational block 7, M blocks 8 weight functions, M blocks 9 forming average values and M averaging filters 10,

The device works as follows.

The input signal split into low-frequency components in the input splitter 1 is delayed in the M-branch delay line 3 so that at its taps a vector of signals is formed necessary to obtain estimates of the impulse response counts. In the intersymbol distortion corrector 4, the signals are compensated intersymbol interference from previous characters.

Then, using the corrected signal, using known solutions accumulated from decision block 2 in shift register 6, in data preparation block 5, the necessary signals for preliminary estimation are obtained, which are obtained by solving the system of equations in the computational block 7. weight functions, where, based on the calculated average values of the pulse response counts in the average formation blocks 9, the offset of the pre-shift is compensated

Editor N.Shrydka

Compiled by V.Kamal gin

Tehred A. Kravchuk Proofreader T. Kolb

Order 796/61 Circulation 639 Under the first comprehensive VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab ,, d, 4/5

Production and printing company, Uzhgorod, Projecto st., 4

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The effective estimates are those obtained in the computing unit 7, From the outputs of the block 8 of the weight functions, the signals are fed to the averaging filters 10, where the final estimation of the impulse response counts takes place.

Claims (1)

Invention Formula A device for estimating communication channel parameters, comprising a serially connected decision block and a shift register, M averaging filters, an M-delay line, an input splitter whose input is an input of the device, and an output connected to the input of the M-latency delay line the outputs of the M averaging filters are device inputs, characterized in that, in order to increase the accuracy of the estimate, M blocks of the formation of mean values, M blocks of weight functions and successively connected offsets are introduced distortions, a data preparation unit and a computational unit, whose M outputs are connected to the inputs of the corresponding averaging filters through the corresponding blocks of the weight functions and through the corresponding averages forming blocks to the second inputs of the remaining weight functions, the M outputs of the averaging filters are connected to the corresponding first the intersymbol corrector corrector inputs, the second inputs of which are connected to the corresponding outputs of the M-branch delay line, and the third inputs are connected to the corresponding of the first shift register outputs, second inputs of which are connected to respective inputs of data preparation unit and to the corresponding inputs schtsh third weighting functions of the respective blocks, and the output of delay M flowline is connected to the auxiliary input data preparation unit.