研究了随机Ｍ进制正交码混合ＤＳＳＦＨ扩频码分多址信号经过多径随机衰落信道，在非相干ＲＡＫＥ接收机中采用等增益组合分集接收时系统的性能．给出了差错概率表示式，并且给出了差错概率的近似计算方法．和以往分析方法不同的是，在计算中只需知道多径衰落功率的一阶、二阶矩，而不需要知道确切的衰落分布．讨论了分集数、Ｍ值、多径衰落、多用户干扰等对系统性能的影响，并进行了数值计算与分析． The performance of a system using equal-gain combined diversity reception with random M-ary orthogonal code hybrid DS-SFH spread-spectrum CDMA signals over multipath fading channels is studied. The error probability expression is given, and the approximate calculation method of error probability is given. Different from previous analysis methods, only the first order and second moment of multipath fading power need to be known in calculation without knowing the exact fading distribution. The effects of diversity, M value, multipath fading, multi-user interference on system performance are discussed, and the numerical calculation and analysis are carried out.