MC-CDMA系统存在频偏时的性能分析  

Performance analysis of MC-CDMA systems in the presence of frequency offset

作　　者：胡哲[1] 张薇[1] 柴志军[1] 

机构地区：[1]哈尔滨工程大学信息与通信工程学院,哈尔滨150001

出　　处：《信息技术》2008年第6期94-96,99,共4页Information Technology

摘　　要：多载波码分多址(MC-CDMA)是把正交频分复用(OFDM)和码分多址(CDMA)结合起来的新一代移动通信系统。详细构建了一个MC-CDMA系统的数学模型,并给出了载频偏移和多径信道存在时的矩阵-向量表示模型。在此系统模型的基础上,分析了频偏对MC-CDMA系统多用户检测器性能的影响。MATLAB仿真显示了MC-CDMA系统对频偏极为敏感,当经历多径Rayleigh信道时,系统只能忍受较小的频偏。Multi-carrier code division multiple access（MC-CDMA） combines orthogonal frequency diversion multiplexing （OFDM） and CDMA together, which is a promising candidate for the next generation communication systems. In this paper, a matrix-vector transmission model is proposed for MC-CDMA systems in the presence of frequency offset and multi-path channel. Based on the system model, the effects of frequency offset on the performance of MC-CDMA systems are studied by the computer simulations. It is shown that MC-CDMA is sensitive to frequency offset, and only the unknown frequency offset of a small value can be tolerated by a multiuser detector.

关 键 词：OFDM MC-CDMA 载频偏移 多用户检测器 

分 类 号：TN929[电子电信—通信与信息系统]