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讨论了Ｍ－ａｒｙ正交调制ＤＳ／ＣＤＭＡ系统在瑞利及莱斯衰落下的误码性能。采用理论分析的方法，推导出了在瑞利及莱斯衰落下ＤＳ／ＣＤＭＡ系统误码率的闭式表达，理论分析与数值积分结果相符。对于实际信道功率时延曲线为指数衰减的情况，讨论了不同指数衰减率对系统性能的影响，并就分集接收方案及不同系统参数的影响也作了分析。结果表明随着指数衰减率的增加和莱斯参数的减小，误码逐渐增大；而随着分集的加入，系统误码性能可大大改善。
The BER performance of M-ary quadrature modulation DS / CDMA systems under Rayleigh and Rice fading is discussed. With the method of theoretical analysis, the closed-form expression of bit error rate of DS / CDMA system under Rayleigh and Rice fading is deduced. The theoretical analysis is consistent with the numerical integration results. For the case that the actual channel power delay curve exponentially decays, the influence of different exponential decay rates on the system performance is discussed, and the influence of the diversity reception scheme and different system parameters is also analyzed. The results show that as the exponential decay rate increases and the Rice parameter decreases, the error increases gradually. With the addition of diversity, the systematic error performance can be greatly improved.