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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
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
Keyword:
CMA,
nonstationary MAI,
widely linear,
adaptive step-size,
Full Text: PDF
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.
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