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在无线移动通信中，许多实测数据表明Ｎａｋａｇａｍ ｉ分布较好地描述了多径衰落信道。本文研究ＤＳ－ＣＤＭＡ系统在Ｎａｋａｇａｍ ｉ衰落信道下，应用相干接收时的误码性能基础上，对多径衰落信道中误码率算法作了改进。据理论计算和计算机仿真可以得出以下结论：（１）在多径衰落信道下，应用多径分集技术可以大大改善系统的性能；（２）在对ＤＳ－ＣＤＭＡ系统进行研究时，Ｎａｋａｇａｍ ｉ多径衰落信道模型可以更好地模拟都市环境下的移动通信信道；（３）当ｍ ｓ 为整数时，可以简化误码率表达式，以使算法复杂度降低。
In wireless mobile communications, many measured data show that the Nakagam i distribution better describes the multipath fading channel. This paper studies the DS-CDMA system in Nakagami i fading channel, the application of coherent reception error performance based on the multipath fading channel error rate algorithm is improved. According to the theoretical calculation and computer simulation, we can draw the following conclusions: (1) Under the multi-path fading channel, the application of multipath diversity can greatly improve the performance of the system; (2) In the research of DS-CDMA system, Path fading channel model can better simulate the mobile communication channel in the urban environment; (3) When m s is an integer, the error rate expression can be simplified to reduce the complexity of the algorithm.