Echo cancellation based on blind source separation

doi:10.3724/SP.J.1087.2012.02707

Journal of Computer Applications ›› 2012, Vol. 32 ›› Issue (10): 2707-2710.DOI: 10.3724/SP.J.1087.2012.02707

• Network and communications • Previous Articles Next Articles

Echo cancellation based on blind source separation

WANG Zhu-yi¹,YANG Jian-po²,YIN Yong-chao¹,WANG Zhen-chao¹

1. College of Electronic and Information Engineering, Hebei University, Baoding Hebei 071002, China
2. Allwin Telecommunication Company Limited, Guangzhou Guangdong 510000, China

Received:2012-04-01 Revised:2012-05-25 Online:2012-10-23 Published:2012-10-01
Contact: WANG Zhu-yi

基于盲信号分离的回波抵消技术

王竹毅¹,杨建坡²,尹永超¹,王振朝¹

1. 河北大学电子信息工程学院, 河北保定 071002
2. 奥维通信股份有限公司,广州 510000

通讯作者: 王竹毅
作者简介:王竹毅（1976-）,女,陕西户县人,讲师,硕士,主要研究方向：数字图像处理、信号处理；杨建坡（1968-）,男,河北蔚县人,工程师,主要研究方向：网络通信、无线通信；尹永超（1986-）,男,河北衡水人,硕士研究生,主要研究方向：数字通信；王振朝（1958-）,男,山东鄄城人,教授,博士,主要研究方向：现代通信理论及技术、低压电力线载波通信、网络通信。
基金资助:
河北大学科研基金资助项目;奥维通信股份有限公司研究项目

Abstract

Abstract: An echo cancellation method on digital repeater of mobile communication system was presented to solve the problem of traditional adaptive filter, which cannot eliminate the sub-path echo in complex multipath channel. Firstly, based on phase space reconstruction theory, the signal that came from the donor antenna and contained echo was reconstructed; hence, the number of sensors was not fewer than the number of sources in blind source separation. Secondly, Independent Component Analysis (ICA) algorithm was used to separate reconstructed signal. Finally, desired signal was determined by the correlation of sent signal and separated signal. In the experiment on the multi-carrier Global System of Mobile communication (GSM) source with complex multipath echo, correlation coefficient of desired signal was up to 0.9593. The echo cancellation method based on blind source separation proves to be an effective way to eliminate the echo in complex multipath channel.

Key words: repeater, echo cancellation, blind source separation, Independent Components Analysis （ICA）, phase space reconstruction, Global System of Mobile communication （GSM）

摘要： 针对数字直放站回波抵消技术中自适应滤波法在多径回波信道条件下不能完全消除次径回波的问题,提出了基于盲信号分离的直放站回波抵消方法。首先对施主天线接收的混合信号进行相空间重构,使观测信号的数目大于等于独立信源的数目；然后利用独立分量分析法（ICA）对重构的信号进行盲信号分离；最后根据各分离信号和发送信号的相关情况判断有用信号,实现回波消除。对复杂多径回波信道条件下的多载波全球移动通信系统（GSM）信源进行回波抵消测试,分离得到的有用信号的相关系数可以达到0.9593。表明盲信号分离的方法可以实现复杂多径信道下的直放站回波抵消,有效解决了传统的自适应滤波法存在的问题。

关键词: 直放站, 回波抵消, 盲信号分离, 独立分量分析, 相空间重构, 全球移动通信系统

CLC Number:

TN911.7

WANG Zhu-yi YANG Jian-po YIN Yong-chao WANG Zhen-chao. Echo cancellation based on blind source separation[J]. Journal of Computer Applications, 2012, 32(10): 2707-2710.

王竹毅杨建坡尹永超王振朝. 基于盲信号分离的回波抵消技术[J]. 计算机应用, 2012, 32(10): 2707-2710.

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Echo cancellation based on blind source separation

基于盲信号分离的回波抵消技术

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