基于CDMA多用户检测算法的性能比较及仿真分析

Multiple-access interference exists in CDMA systems because of the incomplete orthogonal spreading code. The conventional receiver can not overcome this problem. When the near-far effect exists, the system will show a big decline in performance. Multi-user detection take full advantage of multi-user information, and Multi-user detection is the key technology which can effectively suppress multiple access interference. First, we introduce the Multi-user detectors for synchronous uncoded CDMA systems, and present the Matlab simulation on how the different Multi-user detectors have impact on the system capacity and combat the near-far effect in both AWGN channel and flat Rayleigh channel, and provide the theoretical basis for the practical application of engineering.