一种改进的异步CDMA信号的盲解扩算法  

An improved approach to blind despreading of the asynchronous CDMA signal

作　　者：张花国[1] 李鑫[1] 

机构地区：[1]电子科技大学电子工程学院,四川成都611731

出　　处：《电子技术应用》2015年第10期77-80,共4页Application of Electronic Technique

基　　金：国家自然科学基金(61201282);中央高校基本科研业务费(ZYGX2013J016)

摘　　要：对异步码分多址(CDMA)信号的盲解扩进行研究,提出了基于迭代最小二乘投影算法的改进算法。首先将异步CDMA信号建模为带约束的同步CDMA信号模型,并对其进行特征分解。将带约束的同步CDMA信号投影到其信号子空间中,再采用迭代最小二乘投影算法(ILSP)估计扩频序列,并用最小均方误差接收机获得信息码序列的估计值。理论分析和仿真结果表明,提出的算法比原迭代最小二乘投影算法具有更好的估计性能。In this paper, we proposed an improved algorithm based on the iterative least squares with projection （ILSP） algorithm to solve the problem of the blind dispreading of asynchronous code division muhi-access（CDMA） signal. Firstly,the asynchronous CDMA signal was modeled as the synchronous CDMA signal with constraints. Then the eigen-decomposition method was employed to the new signal model. The lISP algorithm was used to estimate the spread spectrum sequence after the synchronous CDMA signal with constraints was projected to its signal suhspace. In the end, an MMSE receiver was implemented to obtain the estimation of the information sequence. The theoretic analysis and experimental results show that the performance of the improved algorithm is better than the ILSP algorithm.

关 键 词：异步码分多址信号 盲解扩 迭代最小二乘投影算法 信号子空间 

分 类 号：TN911.7[电子电信—通信与信息系统]