IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
LETTER
A low-complexity AFF-RLS algorithm using a normalization technique
Seokjin LeeJun-seok LimKoeng-Mo Sung
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2009 Volume 6 Issue 24 Pages 1774-1780

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Abstract

In this paper, we propose a modified RLS algorithm with Adaptive Forgetting Factor using a low-complexity forgetting factor update equation. The conventional AFF-RLS method has a high-complexity update equation to update forgetting factor. In order to reduce complexity, an approximated version of the AFF-RLS method had been derived by Song. But this modified AFF-RLS method shows degraded performance because it suffers from `gradient error amplification' problem. In order to obtain the same performance as AFF-RLS with relatively low computational cost, we noted that AFF-RLS had been derived by `method of steepest descent', and we use normalization technique which is used in NLMS. The Experiment result shows that the proposed method has almost same performance as the conventional AFF-RLS method with relatively low-complexity.

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© 2009 by The Institute of Electronics, Information and Communication Engineers
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