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Performance of Multiuser Detector for CDMA System in Flat Rayleigh Fading Channel

LI Ze-xian; ZHANG Ping; HU Jian-dong (Beijing University of Posts and Telecommunications ,Beijing 100871 China)  
In the CDMA system using the conventional signal detection, the system capacity is limited by the multi-access interference (MAI). Multiuser detection, which makes use of cross-correlation information between two spread spectrum codes, can reduce or eliminate MAI so as to mitigate the near-far effects and increase the system capacity. In this paper we compare performance of linear decorrelator multiuser detector and decision-feedback (DF) detector for the fla Rayleigh fading synchronous channel. Assuming perfect channel estimation, we show that the DF has much lower BER and better antinearfar effect than the decorrelator and Prove that the ideal DF has unity Asymptotic Multiuser Efficiency.
【Fund】: 诺基亚(中国)资助课题
【CateGory Index】: TN929.533
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