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Gradient-Search Based CDMA Multiuser Detection with Estimation of User Powers  

Choi Yang-Ho (강원대학교 전기전자공학부)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.31, no.9C, 2006 , pp. 882-888 More about this Journal
Abstract
Multiuser detection can significantly increase system capacity and improve service quality compared with the existing matched filter. In this paper, we introduce an method which efficiently calculates the maximum likelihood (ML) metric based on the gradient search (GS). The ML detection needs user powers as well as their spreading codes. A method is also proposed that allows us to detect data bits with the estimation of user powers when they are unknown. Computer simulation shows that the proposed method can nearly achieve the same performance as the GS with perfectly hewn user powers.
Keywords
CDMA; Multiuser detection; Maximum likelihood; Power estimation;
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