多径Rayleigh衰落信道中二元正交码扩频多址通信-北京交通大学学报.PDF

北方交通大学学报980505 北方交通大学学报 科技期刊 JOURNAL OF NORTHERN JIAOTONG UNIVERSITY 第5期1998年10月 第22卷(总第81期) 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 叶 （日希） (北方交通大学电子信息工程学院，北京 100044) 摘　要　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. 关键词　直接序列扩频　多径—衰落　分集组合接收 分类号　TN911.253 DS-SSMA Performance of Binary Orthogonal Codes over Multipath Rayleigh Fading Channels Ye Xi (College of Electronics and Information Engineering,Northern Jiaotong University, Beijing 100044) Abstract　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. Key words　direct-sequence spread-spectrum multipath fading diversity reception 　　 　　直接序列扩展频谱通信技术不仅具有多址能力，　而且由于其自身固有的时间分集能力，它还 1 具有抗衰落和抗多径干扰的能力.Enge ［］提出了利用随机正交码进行