Equating method of filter, balancer, wireless communicating device decision feedback

A filter and equalizer technology, applied in electrical components, transmission systems, etc., can solve the problems of poor overall performance of equalizers and reduced convergence speed.

Inactive Publication Date: 2008-10-22
BENQ CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Image 6 The adaptive filter 601 used by the equalizer shown will decrease the convergence speed due to the characteristics of the input signal, and the overall performance of the equalizer will also deteriorate

Method used

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  • Equating method of filter, balancer, wireless communicating device decision feedback
  • Equating method of filter, balancer, wireless communicating device decision feedback
  • Equating method of filter, balancer, wireless communicating device decision feedback

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Embodiment Construction

[0033] figure 1 is a block diagram of an embodiment 100 of the transform-domain adaptive filter of the present invention. The transform domain adaptive filter embodiment 100 includes a filter body 102 , an arithmetic unit 106 and an adaptive arithmetic means group 108 . The embodiment 100 is a 24-order transform-domain adaptive filter, which is realized by using a 4×4 transform matrix device 104 and four 6-order adaptive filter units 140-146.

[0034] The filter body 102 is used to restore the signal x(n) into a restored signal y(n). The signal x(n) is split into four paths by a delay line 126 including delay units 120 - 124 and enters the conversion matrix device 104 . The transformation matrix device 104 is used to decorrelate the signal x(n) to achieve pre-whitening, thereby improving the convergence speed. In this embodiment 100, the transformation matrix device 104 adopts the Fahrenheit transform (WHT), but it can also use discrete Fourier transform (Discrete Fourier ...

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Abstract

The invention consists of a filter, arithmetic unit and a self-adapting calculus device. The filter has a transform matrix device used in pre-whitening signal, and is used in restoring signal into a reduction signal. The arithmetic unit is used in comparing the reduction signal with an expected signal to get an error signal. The self-adapting calculus device is used in using error signal to adjust a filter coefficient of filter, and adopts normalized least mean square, NLMS algorithm.

Description

technical field [0001] The invention relates to a conversion domain adaptive filter, an equalizer and a wireless communication device using the conversion domain adaptive filter, and a decision feedback equalization method. Background technique [0002] Signal transmission will be affected by the channel, so an equalizer is needed at the receiving end to restore the signal. A general equalizer architecture such as Figure 6 As shown, it includes an adaptive filter (adaptive filter) 601 , a decision device (decision device) 602 , a signal generator 604 , a computing unit 606 and a multiplexer (multiplexer) 608 . The multiplexer 608 is controlled by the control signal CS', and one of the signals generated by the selection decision device 602 and the signal generator 604 is the desired signal d'(n). In the training phase, the known training signal (training sequence) is sent as x(n) to the adaptive filter 601 to obtain the restored signal y'(n). At this time, the signal gener...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/12
Inventor 廖伟舜
Owner BENQ CORP
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