Modified RLS Algorithm and Its Application to Channel Estimation for CDMA Systems

Jihoon CHOI  Young-Ho JUNG  

Publication
IEICE TRANSACTIONS on Communications   Vol.E93-B   No.5   pp.1322-1325
Publication Date: 2010/05/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E93.B.1322
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
Keyword: 
RLS algorithm,  channel estimation,  adaptive filtering,  CDMA system,  

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Summary: 
A new adaptive algorithm is proposed by introducing some modifications to the recursive least squares (RLS) algorithm. Except for the noise variance, the proposed algorithm does not require any statistics or knowledge of the desired signal, thus, it is suitable for adaptive filtering for channel estimation in code division multiple access (CDMA) systems in cases where the standard RLS approach cannot be used. A theoretical analysis demonstrates the convergence of the proposed algorithm, and simulation results for CDMA channel estimation show that the proposed algorithm outperforms existing channel estimation schemes.