Improved variable step-size frequency-domain LMS adaptive filtering algorithm

doi:10.3778/j.issn.1002-8331.2009.01.005

Computer Engineering and Applications ›› 2009, Vol. 45 ›› Issue (1): 17-21.DOI: 10.3778/j.issn.1002-8331.2009.01.005

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Improved variable step-size frequency-domain LMS adaptive filtering algorithm

YANG Qun^1,2,XIAO Lin^1,2,ZENG Xue-wen²,WANG Jin-lin²

1.Graduate University of the Chinese Academy of Sciences，Beijing 100049，China
2.National Network New Media Engineering Research Center，Institute of Acoustics of CAS，Beijing 100190，China

Received:2008-09-23 Revised:2008-10-24 Online:2009-01-01 Published:2009-01-01
Contact: YANG Qun

改进的变步长频域批处理LMS算法

杨群^1,2,肖琳^1,2,曾学文²,王劲林²

1.中国科学院研究生院，北京 100049
2.中国科学院声学所国家网络新媒体工程技术研究中心，北京 100190

通讯作者: 杨群

Abstract

Abstract: The fixed step-size FBLMS（Frequency-Domain Block Least Mean Square，FBLMS） which is used in the existing single-carrier system with frequency domain equalization leads to a conflict of convergence speed and steady stage error.Based on the research of variable step-size LMS algorithms，a new improved frequency-domain LMS adaptive filtering algorithm is proposed，which balances the convergence speed and steady stage error by variable step-size and frequency domain weight coefficients leak，and reduces the computation complexity.Through emulations on Matlab platform，it validates that the improved algorithm has the dominance of high convergence speed and small steady stage error.

Key words: frequency-domain, Least Mean Square（LMS） algorithm, adaptive filtering, variable step-size, leak

摘要： 现有的单载波频域均衡技术中的定步长频域批处理LMS（Frequency-Domain Block Least Mean Square，FBLMS）算法，在收敛速度和稳态误差之间存在矛盾。针对这个问题，基于对变步长LMS算法的研究分析，提出了一种新的改进的变步长频域批处理LMS自适应滤波算法，通过变步长因子以及频域权系数抽头泄漏能很好地协调收敛速度和稳态误差之间的矛盾，并且还具有较低的算法复杂度的特点。通过Matlab对提出的新算法进行计算机仿真验证，结果表明该算法有较好的收敛速度和较小的稳态误差。

关键词: 频域, 最小均方（LMS）算法, 自适应滤波, 变步长, 泄漏

YANG Qun^1,2,XIAO Lin^1,2,ZENG Xue-wen²,WANG Jin-lin². Improved variable step-size frequency-domain LMS adaptive filtering algorithm[J]. Computer Engineering and Applications, 2009, 45(1): 17-21.

杨群^1,2,肖琳^1,2,曾学文²,王劲林². 改进的变步长频域批处理LMS算法[J]. 计算机工程与应用, 2009, 45(1): 17-21.

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Improved variable step-size frequency-domain LMS adaptive filtering algorithm

改进的变步长频域批处理LMS算法

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