CDMA通讯系统中正交码组的特性研究与优化选取  

Characteristics and optimal selection of Walsh codes in CDMA systems

作　　者：王波[1] 洪兴楠[1] 惠涛 高葆新[1] 

机构地区：[1]清华大学电子工程系

出　　处：《清华大学学报（自然科学版）》2000年第9期37-40,共4页Journal of Tsinghua University(Science and Technology)

摘　　要：为解决码分多址 (CDMA )移动通讯系统正交码组优化选取的问题 ,论文对此类系统前向信道的信号特点进行了研究 ,并提出了 CDMA前向信道的 Walsh码组的一种优化选取方法。通过对不同 Walsh码组组合所构建的前向信道信号积累分布函数 (CDF)的计算 ,首次归纳总结出了Walsh码组组合对 CDF曲线影响的周期性规律 ;并在这一规律基础上首次提出了优化选取 Walsh码组组合的实用方法 ;同时给出了若干典型 Walsh码组叠加后的数字基带信号形式 ,从而直观地揭示了 Walsh码组组合与 CDF曲线的定性相关关系。The characteristics of the CDMA (code division multiple access) forward channel are analyzed and simulated to develop a method for optimizing the combination of Walsh codes. A program was developed to generate the signal of the CDMA forward channel, which can be used in a nonlinear simulation of the RF circuit for base station design. The CDF (cumulative distribution function) curve for multi channel signals with all kinds of Walsh codes combinations is also studied to find the proper approach for Walsh code selection. The simulation result shows that the program can afford reliable signal sources for microwave CAD software, and the optimal method can be used to find the optimal Walsh code combination.

关 键 词：CDMA前向信道 优化选取 CDMA移动通信 正交码组 

分 类 号：TN929.533[电子电信—通信与信息系统]