平坦瑞利衰落环境下CDMA系统的多用户检测性能
PERFORMANCE OF MULTIUSER DETECTION FOR CDMA SYSTEM IN FLAT RAYLEIGH FADING ENVIRONMENT
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摘要: 在采用传统信号检测方式的CDMA无线通信网中,多址干扰限制了系统的容量和性能。多用户信号检测利用扩频码互相关信息在高斯信道中可以减小或消除多址干扰,缓解远近效应,增加系统容量。本文将多用户检测器直接用于平坦瑞利衰落的CDMA环境中,用分析与仿真相结合的方法讨论了典型多用户算法的误码性能。结果表明,平坦瑞利衰落信道中多用户检测算法的性能仍然优于传统检测算法。
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关键词:
- 码分多址; 瑞利衰落; 多用户检测
Abstract: In a CDMA wireless conmunication network using the conventional signal detection, the capacity of the system is limited and the performance is degraded by the multi-access interference (MAI). The multiuser signal detection, which make use of cross-correlation information between two spread spectrum codes, can reduce or eliminate the MAI in a Gaussian channel so as to mitigate the near-far effects and increase the system capacity. This paper extends the multiuser detector to the flat Rayleigh fading CDMA environment and discusses the bit error rate of typical multiuser detection algorithms in such a environment by combining analysis and simulation. It is concluded that the multiuser detection is superior to conventional detections in the flat Rayleigh fading channels. -
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