多径回波信道条件下回波抵消技术研究

TN929.5; 主要研究移动通信数字同频直放站的回拨抵消技术.通过对基于最小均方误差原理的自适应滤波器的收敛条件进行分析,发现即使在外信道为单径信道或只考虑多径信道的主径回波信道时,现有利用时延去相关的自适应滤波算法,在原理上存在着不能保证满足收敛条件的问题.针对这一问题,本文提出了将发送信号进行延时后再送人自适应估计器的改进措施,有条件地改善了回波抵消效果,并进一步提出了消除多径回波的新型技术原理....

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Bibliographic Details
Published in电信科学 Vol. 28; no. 5; pp. 60 - 64
Main Author 王振朝 梁军君 王竹毅 李会雅
Format Journal Article
LanguageChinese
Published 中国通信学会 01.05.2012
人民邮电出版社有限公司
河北大学电子信息工程学院 保定 071002
Subjects
回波抵消
多径信道
数字同频直放站
自适应滤波算法
自适应滤波算法
多径信道
数字同频直放站
回波抵消
Online AccessGet full text
ISSN1000-0801
DOI10.3969/j.issn.1000-0801.2012.05.011

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Summary:TN929.5; 主要研究移动通信数字同频直放站的回拨抵消技术.通过对基于最小均方误差原理的自适应滤波器的收敛条件进行分析,发现即使在外信道为单径信道或只考虑多径信道的主径回波信道时,现有利用时延去相关的自适应滤波算法,在原理上存在着不能保证满足收敛条件的问题.针对这一问题,本文提出了将发送信号进行延时后再送人自适应估计器的改进措施,有条件地改善了回波抵消效果,并进一步提出了消除多径回波的新型技术原理.
Bibliography:on-frequency digital repeater, echo cancellation, adaptive filtering algorithm, muhipath channel
Wang Zhenchao, Liang Junjun, Wang Zhuyi, Li Huiya （College of Electronic and Information Engineering, Hebei University, Baoding 071002, China）
11-2103/TN
In this paper, we study the echo cancellation technology of the on-frequency digital repeater. By analyzing the convergence condition of adaptive filter based on least mean square （LMS） principle, we find that existing adaptive filtering algorithm using delay to eliminate the relevance is not able to guarantee the convergence condition being satisfied in principle, even when the outer channel is a single-path or a main path of mulfipath channel.We propose a novel algorithm sending the signal into the adaptive estimator after a delaying time to solve the problem. The novel algorithm conditionally improves the effect of echo cancellation. Further more, this oaoer oroooses three new orinciDles to eliminate the multiDath echo.
ISSN:1000-0801
DOI:10.3969/j.issn.1000-0801.2012.05.011