Enhanced Normalized Subband Adaptive Filter with Variable Step Size

Ik Joo† Chung

doi:10.7776/ASK.2013.32.6.518

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2013 Vol.32, Issue 6 Preview Page Next Page

Enhanced Normalized Subband Adaptive Filter with Variable Step Size 가변 스텝 사이즈를 가지는 개선된 정규 부밴드 적응 필터

30 November 2013. pp. 518-524

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Abstract

In this paper, we propose a variable step size algorithm to enhance the normalized subband adaptive filter which has been proposed to improve the convergence characteristics of the conventional full band adaptive filter. The well-known Kwong’s variable step size algorithm is simple, but shows better performance than that of the fixed step size algorithm. However, in case that large additive noise is present, the performance of Kwong’s algorithm is getting deteriorated in proportion to the amount of the additive noise. We devised a variable step size algorithm which does not depend on the amount of additive noise by exploiting a normalized adaptation error which is the error subtracted and normalized by the estimated additive noise. We carried out a performance comparison of the proposed algorithm with other algorithms using a system identification model. It is shown that the proposed algorithm presents good convergence characteristics under both stationary and non-stationary environments.

Keywords

Subband adaptive filter

Normalized subband adaptive filter

Variable step-size

본 논문에서는 전밴드(full-band) 적응 필터의 수렴 특성을 개선하기 위해 제안된 정규 부밴드 적응 필터(NSAF)의 성능을 향상시키기 위한 가변 스텝 사이즈 기반의 알고리즘을 제안하였다. 널리 알려진 Kwong의 가변 스텝 사이즈 적응 필터는 간단한 하면서도, 고정된 스텝 사이즈의 적응 필터에 비하여 우수한 성능을 보인다. 그러나 가산 잡음이 클 경우, 잡음의 크기에 비례하여 성능이 저하되는 단점이 있다. 본 논문에서는 적응 오차에서 추정된 가산 잡음을 차감한 정규 오차를 이용함으로써 가산 잡음에 의존하지 않는 가변 스텝 사이즈 알고리즘을 제안하였다. 시스템 확인 모델 하에서 컴퓨터 모의 실험을 통하여 제안된 알고리즘이 기존의 알고리즘들에 비하여 정상 및 비정상 환경에서 수렴 특성이 우수함을 보였다.

키워드

부밴드 적응 필터

정규 부밴드 적응 필터

가변 스텝 사이즈

References

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Information

Publisher :The Acoustical Society of Korea
Publisher(Ko) :한국음향학회
Journal Title :The Journal of the Acoustical Society of Korea
Journal Title(Ko) :한국음향학회지
Volume : 32
No :6
Pages :518-524
Received Date : 2013-06-18
Revised Date : 2013-08-28
Accepted Date : 2013-08-29
DOI :https://doi.org/10.7776/ASK.2013.32.6.518

The Journal of the Acoustical Society of KoreaISSN:1225-4428(Print) 2287-3775(Online)한국음향학회

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