CDMA扩频通信在多径时延展宽作用下的误码特性  

Modeling and computer simulation for BER performance of CDMA spread spectrum communication with multipath time delay spread

作　　者：滕旭[1] 张林昌[1] 蒋忠涌 

机构地区：[1]北方交通大学抗电磁干扰研究中心,北京100044

出　　处：《铁道学报》2000年第1期57-61,共5页Journal of the China Railway Society

摘　　要：对正交序列扩频通信系统（ＤＳ－ＣＤＭＡ）在多路径脉冲时延展宽（一次参数）作用下的传输误码率（二次参数）特性进行了数学分析建模与计算机模拟分析，研究了一次参数、二次参数之间的变化关系。通过理论分析与计算机模拟，给出了建立一次参数与二次参数之间关系的分析建模方法。计算结果表明，Ｅｂ／Ｎ０ 对传输误码率有较大的影响；数字脉冲平均时延的变化对传输误码率的影响不是非常显著的，而数字脉冲多路径时延展宽对传输误码率的影响是非常明显的。The mathematical model and computer simulation of bit error rate BER(so called second parameter) performance of code division multiple access with direct sequence spectrum spreading DS/CDMA caused by multipath impulse time delay spread(so called first parameter) are presented in this paper. We have analyzed the relations between ‘first parameter' and ‘second paraneter'. The method to form the ralations between ‘first parameter' and ‘second parameter' is derived by theoretic analysis and computer simulations. The calculating results show that E b/N 0 has a greater influence on BER, and that the influence on BER caused by the changes of digital impulse time delay is not obviously, and that the effectiveness on BER caused by digital impulse time delay spread is very remarkable. These analytic results have a good approximation with the measuring results in the paper [4] .

关 键 词：CDMA 脉冲时延展宽 误码率 扩频通信 多径传播 

分 类 号：TN914.4[电子电信—通信与信息系统]