基于SP子空间跟踪的修正的MMSE多用户检测方法  

A Modified MMSE Multiuser Detection Algorithm Based on SP Subspace Tracking

作　　者：汪晋宽[1] 贾利琴[1] 刘志刚[1] 薛桂芹[1] 

机构地区：[1]东北大学信息科学与工程学院,辽宁沈阳110004

出　　处：《东北大学学报（自然科学版）》2006年第4期382-385,共4页Journal of Northeastern University(Natural Science)

基　　金：教育部博士点基金资助项目(20050145019);河北省教育厅科学研究指导计划项目(Z2004103)

摘　　要：分析比较了多种子空间跟踪算法.复杂度高的特征值分解和奇异值分解不利于工程实现,而低复杂度的PASTd应用于多用户检测导致收敛速度慢并且检测性能差.介绍了SP子空间跟踪算法,利用SP算法跟踪信号子空间求得解调向量,设计了修正的MMSE检测器.与SVDMUD和PASTd MUD两种算法相比,仿真结果显示SP MUD算法收敛速度快,输出信噪比和误码率性能接近SVD MUD算法,并保持了较低的计算复杂度,是一种较好的实现方案.Several algorithms of subspace tracking are analyzed high computation complexity are not adaptable to engineering Eigenvalue decomposition and singular value decomposition with practice, while the multiuser detection implemented by PASTd with less computation complexity provides low convergence rate and detectability. Introduces the SP algorithm and utilizes it to track the signal subspace .so as to obtain a demodulating vector. A modified MMSE detector was thus designed. To compare it with the performance of PASTd MUD and SP MUD, a simulation test was conducted and the results showed that the SIP MUD algorithm with less computation complexity has faster convergence rate and provides the output SINR/bit error rate （BER） similar to SVD MUD.

关 键 词：子空间跟踪 多用户检测 MMSE 多址干扰 CDMA 

分 类 号：TN971.1[电子电信—信号与信息处理]