Adaptive step-size widely linear linearly constrained constant modulus algorithm for DS-CDMA receivers in nonstationary interference environments

In this paper, we propose a new adaptive step-size widely linear constant modulus algorithm (CMA) in DS-CDMA systems especially for time-varying interference environment. The widely linear estimation enables CMA to produce better output signal to interference plus noise ratio (SINR) and the adaptive...

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Bibliographic Details
Published in:Signal processing 2007-06, Vol.87 (6), p.1523-1527
Main Authors: Lim, JunSeok, Han, Ki-Young, Jeon, Jaejin
Format: Article
Language:English
Subjects:
Adaptive step-size
Applied sciences
CMA
Exact sciences and technology
Information, signal and communications theory
Linearly constrained CMA
Modulation, demodulation
Signal and communications theory
Telecommunications and information theory
Widely linear
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Summary:In this paper, we propose a new adaptive step-size widely linear constant modulus algorithm (CMA) in DS-CDMA systems especially for time-varying interference environment. 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. Simulations have confirmed that the proposed algorithm performs better in a DS-CDMA system by employing a BPSK modulation than other algorithms that do not use widely linear processing.
ISSN:0165-1684
1872-7557
DOI:10.1016/j.sigpro.2006.12.003