多径衰落下多天线CDMA系统信道容量研究
Capacity of Multi-antenna CDMA System under Multipath Fading Channels
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摘要: 该文对准静态Rayleigh衰落下MIMO-CDMA系统信道容量进行了研究，分析了扩频码为Walsh函数，基于多码检测的极大似然检测器(MLD)和解相关检测器的性能，并和MMSE多用户检测器(MUD)进行了比较；分析了对不同检测器在一定的信噪比下系统天线数目和信道容量的关系。仿真结果表明：在相同的情况下，基于Walsh码CDMA系统容量按MUD、干扰方差已知的MLD，干扰方差未知的MLD和解相关检测器递减，并且后面的3种检测器在大信噪比的时候均有渐进的平台效应；在信噪比较大且一定时，CDMA系统信道容量与天线数目呈线性关系。Abstract: The performance of Maximum Likelihood Detector (MLD), decorrelating detector which based on multi-code detections and MMSE Multi-User Detector(MUD) of MIMO CDMA system under Rayleigh fading channels were analyzed in the paper. The relation between the number of antennas and system capacity at a given SNR was also analyzed. The numerical results present that the capacity is degressive for MMSE MUD, MLD with interference covariance known, MLD with interference covariance unknown, and decorrelating detector, furthermore the three latter detectors all have platform as SNR is large; at a given SNR, the relation of system capacity and the number of antenna is linear for a NN system.
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