CDMA系统中多用户多路径情况下的DOA估计新方法  

Joint DOA estimation and array calibration in the DS-CDMA systems in the multi-path environment using uniform linear array

作　　者：单志勇[1] 杨世达[2] 周希朗[3] 

机构地区：[1]东华大学信息学院通信系,上海200051 [2]武汉理工大学计算机系,湖北武汉430070 [3]上海交通大学信息学院电子系,上海200030

出　　处：《系统工程与电子技术》2007年第4期528-531,共4页Systems Engineering and Electronics

基　　金：国防预研基金资助课题

摘　　要：提出了一种新型算法,对CDMA系统中所有用户、所有路径的DOA进行估计。该算法首先采用码匹配滤波方法,对码间干扰和符号间干扰进行精确建模,再利用接收信号滤波前后的协方差矩阵消除噪声的影响并且巧妙设计了一个方程,最后导出了一个基于大数定律的联合DOA估计和阵列校准的新型最大似然估计。仿真结果证明了该算法的正确有效性。An algorithm for DOA estimation of signals from multiple mobile users in the CDMA systems in multipath environment is presented. The algorithm employs code-matched filter and models the inter-symbol interference （ISI） and multiple-access interference（MAD exactly. The correlation matrices of the received signals after codematched filtering are employed to estimate the variance of the additive white Gaussian noise, and a novel mathematical problem is created, then a new maximum Likelihood（MID method based on the strong law of large number can be derived for DOA estimation and array calibration, finally computer simulation proved its effectiveness.

关 键 词：码分多址 波达角 通信系统 信号处理 

分 类 号：TN919[电子电信—通信与信息系统]