一种新的CDMA扩展码设计方法  

A New Design Method of CDMA Spreading Sequences

作　　者：毕见鑫[1] 王映民[1] 易克初[1] 

机构地区：[1]西安电子科技大学综合业务网国家重点实验室,西安710071

出　　处：《电子学报》2001年第4期479-482,共4页Acta Electronica Sinica

基　　金：国家自然科学基金! (No .69872 0 2 7)

摘　　要：本文首先通过理论分析 ,给出基于两带镜像多速率滤波器组设计的多值CDMA扩展码的关于循环相关特性的理论性能限及达到此限的条件 ,说明了基于多速率酉滤波器组设计的扩展码达到了此界限 ;然后提出了一种基于熵最大化的优化准则来产生CDMA扩展码的设计方法 .仿真表明了该方法设计的CDMA扩展码性能的优越性 .It is well-known that the multi-value CDMA spreading codes can be designed by means of a pair of mirror multi-rate filter banks based on some optimizing criterion.This paper indicates that there exists a theoretical bound in the performance of its periodic correlation property,and gives the condition on which the bound is achieved.Based on this analysis,a criterion of maximizing entropy is proposed to design such codes.Computer simulation results show the performance superiority of the resulted codes.

关 键 词：多速率滤波器 码分多址 扩展码 设计 

分 类 号：TN914.53[电子电信—通信与信息系统]