DS-CDMA系统盲信道阶数与在线用户个数估计  

Blind Estimation of Channe 10 rder and Number of Active Users for DS-CDMA Systems

作　　者：张江[1] 张杭[2] 柴仁文[3] 

机构地区：[1]解放军理工大学通信工程学院研究生4队,江苏南京210007 [2]解放军理工大学通信工程学院 [3]山东省军区司令部,山东济南250000

出　　处：《军事通信技术》2013年第4期7-11,共5页Journal of Military Communications Technology

基　　金：国家自然科学基金资助项目(61001106);国家重点基础研究发展计划(973计划)资助项目(2009CB320403)

摘　　要：文章针对盲多用户检测中信道阶数与在线用户个数未知的问题,提出一种仅利用单路观测信号的盲信道阶数与在线用户个数估计算法。首先利用串并变换将单路观测信号转换为多路观测信号,然后利用多路观测信号协方差矩阵的信号子空间个数与信道阶数以及在线用户个数之间的关系估计得到信道阶数以及在线用户个数。仿真结果表明该算法在低信噪比条件下具有较好的性能,但其性能随着信道阶数的增加逐步恶化。To solve the problem that some blind multi-user detection algorithms need to know the channel order and the number of active users, a blind algorithm with single observation was proposed. Firstly, the single observation was transferred into multiple observations by series to parallel operation. Then the channel order and the number of active users were estimated by exploiting the relationship among the number of subspace of the covariance matrix of the multiple observations, the channel order and the number of active users. The simulation result shows that the proposed algorithm can work well in low SNR, but its performance degrades as the channel order increases.

关 键 词：直接序列扩谱码分多址 子空间 盲信道阶数估计 盲在线用户个数估计 

分 类 号：TN911.72[电子电信—通信与信息系统]