Title:
SYSTEM AND METHOD FOR ADAPTIVE CHANNEL EQUALIZATION IN A TIME VARYING CHANNEL
Document Type and Number:
WIPO Patent Application WO/2019/179475
Kind Code:
A1
Abstract:
Systems and methods are provided for adaptive equalization, for example for use with coherent optical reception. The equalizer has a loop for updating taps of an adaptive linear filter forming part of the equalizer. In the loop, an error calculator calculates an error, a gradient calculator calculates a gradient of the error or filtered error. One or more gradient filters are used to filter the gradient, and the filtered gradient is used to update the taps of the adaptive linear filter. A reduction in self oscillation in the equalizer is achieved by separating the frequencies with channel features that change with time and scaling them up to speed up convergence of the equalizer.
Inventors:
ABUGHALIEH NASH'AT (CA)
ZHANG ZHUHONG (CA)
ZHANG ZHUHONG (CA)
Application Number:
PCT/CN2019/078918
Publication Date:
September 26, 2019
Filing Date:
March 20, 2019
Export Citation:
Assignee:
HUAWEI TECH CO LTD (CN)
International Classes:
H04L25/03
Foreign References:
| US20100287420A1 | 2010-11-11 | |||
| US20030063664A1 | 2003-04-03 | |||
| US20130259113A1 | 2013-10-03 | |||
| CN106656881A | 2017-05-10 | |||
| CN106982183A | 2017-07-25 |
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