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Time domain self-adapted balancer

A delayer, decision feedback equalization technology, used in electrical components, transmission systems, etc.

Active Publication Date: 2012-01-04
HISENSE VISUAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention solves the equalization problem of multipath signals in the decoding time delay, and at the same time realizes the decoding of the maximum likelihood sequence under the condition of channel distortion

Method used

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  • Time domain self-adapted balancer

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Embodiment Construction

[0018] image 3 A block diagram of the time-domain adaptive equalizer 300 of the present invention is shown. refer to image 3, the equalizer 300 includes a finite impulse response (FIR) filter 222, a signal adder 230, a delay unit 232, a level decision device 326 based on NR decoding, and a decision feedback equalization (DFE) filter 224 , an error signal generator 227, and a coefficient update controller 229. The FIR filter 222 receives the input signal R, performs forward filtering on the input signal R, and eliminates forward multipath, which is a multipath signal arriving earlier than the main transmission signal. The output S1 of the FIR filter 222 is connected to an input of a signal adder 230 . The signal adder 230 adds the output S1 of the FIR filter 222 and the output S2 of the DFE filter 224 to provide an output S, which is an equalized output O. The balanced output O is then input to the level determiner 326 and the delay unit 232 respectively. The level decid...

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Abstract

The invention relates to a self-adaptive time domain equalizer comprising a feedforward filter which receives input signal and is used to eliminate forward multipath; a decision-feedback equalization filter used to eliminate backward multipath; a signal superimposer receiving the output from feedforward filter and decision-feedback equalization filter, making a sum and a equalization output; a level decision device which makes a decision for the equalization output and delivers the decision to decision-feedback equalization filter; an error signal generator generating error signal according to input signal and output signal of the decision device; a coefficient updating controller generating tap coefficient according to the error signal to update the tap coefficient of feedforward filter and decision-feedback equalization filter. The level decision device comprises a codebook corrector with the function of code space rotating.

Description

technical field [0001] The invention relates to the field of time-domain adaptive equalizer and encoding and decoding technology, in particular to a time-domain adaptive equalizer combined with Nordstrom-Robinson (abbreviated as NR code) code. Background technique [0002] The equalizer is a very important component in the practical application of many different digital information such as voice, data and video communication. Intersymbol Interference (ISI) is an important source of error and usually appears in a burst message. In most digital applications, an equalizer is generally used to correct for ISI errors and channel distortion. For example, equalizers are used as echo cancellers (compensators) for loudspeakers in full-duplex communications, video deghosting in digital television or digital cable transmission, signal conditioners for wireless modems and wireless phones, and more. [0003] figure 1 A block diagram of an equalizer 100 commonly included in digital rec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/10
Inventor 张文军归琳管云峰何大治梁伟强
Owner HISENSE VISUAL TECH CO LTD
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