时变信道中CDMA信号的波达方向 和直接扩频序列盲估计  

Blind Estimation of DOA and Direct Sequence for CDMA Signals in Time-Varying Channel

作　　者：田孝华[1] 廖桂生[1] 

机构地区：[1]西安电子科技大学雷达信号处理重点实验室,陕西西安710071

出　　处：《电子学报》2002年第9期1323-1326,共4页Acta Electronica Sinica

基　　金：国家自然科学基金(No.69802009)

摘　　要：本文研究CDMA信号的波达方向和直接扩频序列同时估计问题,在无任何波达方向信息的条件下,提出了利用用户特征序列定义一种新的目标函数,通过对目标函数寻优得到最佳权矢量,从而实现对波达方向和直接扩频序列进行估计,并利用改进的递归算法对权矢量进行实时更新,以适应移动通信无线环境的时变而导致信号的非平稳变化.该方法既适用于平稳信号,也适用于非平稳信号,仿真结果证实了该方法的有效性.Based on the signature sequence of users, a new method is proposed to provide the simultaneous estimation of both the direction of arrival (DOA) and the direct sequence for nonstationary code division multiple access (CDMA) signals. First, a new cost function is defined using the signature sequence of users; then the optimum weight vector is obtained by searching the cost function; finally trace of the weight vector is completed by the improved recursive algorithm to fit the nonstationarity of signals caused by the time-varying channel. The robust method is suitable for both stationary and nonstationary signals, and the effectiveness of the method is showed by the simulation results.

关 键 词：时变信道 CDMA信号 直接扩频序列 盲估计 波达方向 非平稳信号 移动通信 码分多址 

分 类 号：TN929.533[电子电信—通信与信息系统] TN911.7[电子电信—信息与通信工程]