Adaptive Rake Receiver with Sliding Window Linearly Constrained RLS Algorithm for Multipath Fading DS-SS CDMA System

Shiunn-Jang CHERN  Chun-Hung SUN  Hsin-Pei LEE  

IEICE TRANSACTIONS on Communications   Vol.E87-B    No.7    pp.1970-1976
Publication Date: 2004/07/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technology
DS-SS CDMA systems,  multipath fading channel,  narrowband interference,  multiple access interference,  sliding window LC-RLS algorithm,  

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An adaptive filtering algorithm based on the sliding window criterion is known to be very attractive for violent changing environments. In this paper, a new sliding window linearly constrained recursive least squares (SW-LC-RLS) algorithm based on the modified minimum mean squared error (MMSE) structure is devised for the RAKE receiver in direct sequence spread spectrum code-division multiple access (DS-SS CDMA) system over multipath fading channels, where the channel estimation scheme is accomplished at the output of adaptive filter. The proposed SW-LC-RLS algorithm has the advantage of having faster convergence property and tracking ability, and can be applied to the environments, where the narrowband interference is joined suddenly to the system, to achieve desired performance. Via computer simulation, we show that the performance, in terms of mean square errors (MSE), signal to interference plus noise ratio (SINR) and bit error rate (BER), is superior to the conventional LC-RLS and orthogonal decomposition-based LMS algorithms based on the MMSE structure.