多径Rayleigh衰落信道中二元正交码扩频多址通信系统的性能分析

研究了随机二元正交码直接序列扩频多址信号在多径Rayleigh衰落信道传输中,在非相干RAKE接收机中采用两种不同最大选择接收方案(最大输出信噪比选择及最大输出功率选择分集接收)时,系统的差错特性和差错概率表达式.数值计算结果示出了在多径衰落信道中,分集接收对扩频多址系统性能的影响,同时表明在多径Rayleigh衰落信道中,最大输出功率选择分集接收时扩频系统的差错性能优于最大输出信噪比选择时扩频系统的差错特性.

DS-SSMA Performance of Binary Orthogonal Codes over Multipath Rayleigh Fading Channels

Performance of binary orthogonal direct sequence spread spectrum multipleaccess(DS SSMA) signals over multipath Rayleigh fading channels with noncoherent RAKE receiver is concerned in this paper. Two different maximum selection diversity reception schemes, maximum output signal to noise ratio selection and maximum output rate of work selection, are considered. The equations of the error bit probabilities of the diversity reception schemes, the error characters of system are presented. Numerical results show that diversity reception is effective for improving the error performance of DS SSMA spread spectrum systems over multipath fading channels and the maximum output selection scheme has a slightly lower bit error probability than the maximum signal to noise ratio selection scheme over multipath Rayleigh fading channels.