Adaptive Step-Size Widely Linear Constant Modulus Algorithm for DS-CDMA Receivers in Nonstationary Interference Environments

Jun-Seok LIM
Jae-Jin JEON
Koeng-Mo SUNG

Publication
IEICE TRANSACTIONS on Communications   Vol.E90-B    No.1    pp.168-170
Publication Date: 2007/01/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.1.168
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
Keyword: 
CMA,  nonstationary MAI,  widely linear,  adaptive step-size,  

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Summary: 
In this Letter, we propose a new adaptive step-size widely linear constant modulus algorithm (CMA) in DS-CDMA systems especially for time-varying interference environments. The widely linear estimation enables CMA to produce better output signal to interference plus noise ratio (SINR) and the adaptive step-size tackles the time-varying interference environment effectively. The simulations confirm that the proposed algorithm shows better performance in a DS-CDMA system employing a BPSK modulation than other algorithms without use of widely linear processing.