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Blind equalizing method in satellite demodulator

A technology of satellite demodulator and blind equalization, which is applied to the shaping network and baseband system components in the transmitter/receiver, and can solve the problem of wasting time and resources of transmission

Active Publication Date: 2011-04-06
郑州融壹达信息技术有限公司
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AI Technical Summary

Problems solved by technology

The traditional approach is to waste a part of the transmission time resource by sending the training sequence

Method used

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  • Blind equalizing method in satellite demodulator
  • Blind equalizing method in satellite demodulator
  • Blind equalizing method in satellite demodulator

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Embodiment Construction

[0021] Such as figure 1 As shown in -2, the blind equalizer structure adopted by the method of the present invention is mainly composed of a variable coefficient filter 10, a judger 20, an error generator 30, and a filter coefficient iterator 40. The blind equalizer is restored by the following steps Send sequence signal:

[0022] 1) The input complex sequence signal x(n)=xR(n)+jxI(n) enters the variable coefficient filter 10 one way, and the other enters the filter coefficient iterator 40; passes through the variable coefficient filter 10 The digital circuit calculates according to the following convolution formula to get the output complex sequence signal y(n)=yR(n)+jyI(n):

[0023] y ( n ) = X k = 0 N - 1 w k ( n ) x ( n - k )

[0024] Where the plural w k (n)=wR k (n)+jyI k (n) is the corresponding filter coefficient, N is a high-order constant;

[0025] 2) The complex sequence signal y(n)=yR(n)+jyI(n) output by the...

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Abstract

The invention relates to a blind equalization method in a satellite demodulator, which is an improvement on the existing minimum mean-square, the algorithm of the invention is as follows: wRk(n+1)=wRk(n)-mu(cR(n)*sign(eR(n))sign(xR(n-k))+cI(n)*sign(eI(n))sign(xI(n-k))), wIk(n +1)=wIk(n)+mu(cR(n)*sign(eR(n))sign(xI(n-k))-cI(n)*sign(eI(n))sign(xR(n-k))), wherein cR(n)=(dR(n))<2>, cI(n)=(dI(n))<2>, mu is a stepping constant, the function sign is a symbol-fetching function; when the blind equalization method of the invention is adopted, the hardware scale of the existing blind equalization devices can be simplified, a multiplier can be dispensed, the computation volume is reduced, the computing capability is greatly improved, and the sequence sending can be correctly restored in real time for signal inputting.

Description

Technical field [0001] The invention relates to the field of satellite communications, satellite remote sensing, and satellite broadcast ground digital receiving systems, and specifically designs a blind equalization method suitable for high-speed satellite digital demodulators. Background technique [0002] In a wireless digital communication system, the inherent bandwidth limitation of the channel tends to increase the distortion of the received signal. For example, a bandwidth-limited channel is likely to cause the spread of the transmitted pulse. If the width of the spreading pulse exceeds the duration of a symbol, the overlap of adjacent pulses will occur, reducing the performance of the receiver. This phenomenon is called inter-symbol interference (ISI). Inter-symbol interference (ISI) caused by channel distortion and distortion is a major factor affecting communication quality and requires effective channel equalization technology to eliminate it. The traditional approach...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03
Inventor 李黎明
Owner 郑州融壹达信息技术有限公司
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