最大选择分集接收M进制正交码DS－CDMA扩频通信系统性能分析

DS CDMA PERFORMANCE OF M ARY ORTHOGONAL CODES WITH MAXIMUM SELECTION DIVERSITY RECEPTION

研究了随机Ｍ进制正交码直接序列扩频码分多址信号经过多径瑞利频率非选择性衰落，在非相干ＲＡＫＥ接收机中采用最大输出信噪比选择或最大输出选择分集接收时系统的性能；给出了两种分集接收情况下的差错概率表达式。数值计算研究了分集数、Ｍ值、多用户干扰对系统性能的影响。

Performance of M ary orthogonal direct sequence code division multiple access (DS-CDMA) signals over multipath Rayleigh fading channel with noncoherent RAKE receiver is examed. Two maximum selection diversity reception schemes, maximum signal to noise ratio selection and muximum output selection, are considered. Equations of the probability of error of the two diversity reception schemes are presented. Numerical results show the effect of the number of diversity, value of M, and multiple access interference on the system's performance.