基于独立分量分析的DS-CDMA下行信道延迟估计  

Delay Estimation Based on Independent Component Analysis in DS-CDMA Downlink

作　　者：李晓辉[1] 吴小培[1] 吴蓓[1] 

机构地区：[1]安徽大学计算智能与信息处理教育部重点实验室电子工程与信息科学系,合肥230039

出　　处：《系统仿真学报》2005年第4期954-956,共3页Journal of System Simulation

摘　　要：将独立分量分析方法引入DS-CDMA系统,通过对DS-CDMA信号模型和线性有噪ICA模型的比较,得出这两种模型具有相同形式。因此,提出了一种基于ICA的DS-CDMA下行信道的延迟估计方法。该方法采用固定点ICA算法来估计多径信道的混合矩阵,从而提取信道的延迟信息。仿真结果表明:与匹配滤波检测方法相比,该方法具有更好的性能。Independent Component Analysis (ICA) techniques are considered in DS-CDMA communication system. Comparing the matrix CDMA signal model with the matrix noisy linear ICA model shows that it has the same form as the ICA model. Therefore, we propose a method of delay estimation in a block fading CDMA downlink based on ICA. The mixture matrix of multi-path channel can be estimated using a fast fixed-point algorithm, and then the delay information of channel can be obtained. The simulation results show that the proposed method has better performance compared with matched filter (MF) method.

关 键 词：码分多址 独立分量分析 信道估计 匹配滤波 

分 类 号：TN911.5[电子电信—通信与信息系统]