多径衰落信道下基于子空间的RLS盲多用户检测  

Subspace-based blind adaptive multiuser detection using RLS filter with multi-path

作　　者：兰元荣[1] 王东昱[2] 武梦龙[2] 杨大成[1] 

机构地区：[1]北京邮电大学无线通信中心 [2]北方工业大学信息工程学院,北京100041

出　　处：《电路与系统学报》2008年第6期34-39,共6页Journal of Circuits and Systems

基　　金：国家自然科学基金资助项目(60507007)

摘　　要：本文在RLS盲检测算法的基础上,利用子空间的概念,构建了基于子空间的RLS多用户盲检测算法,在仅仅需要知道目标用户的特征序列和定时的条件下,自适应地估计检测向量,通过理论分析表明,改进的检测算法在运算复杂度上低于满秩RLS算法[7]。仿真结果表明,改进的检测算法收敛性能优于满秩RLS算法,同时在特征序列畸变条件下表现出健壮性也远优于满秩RLS检测算法。A new blind adaptive multiuser detection scheme based on the hybrid of RLS filter and subspace estimation is proposed. It is shown that this detector can be expressed as an anchored signal in the signal subspace and the coefficients can be estimated by the RLS filter only requiring the knowledge of the signature waveform and the timing of the desired user. The resulting subspace-based algorithm brings the benefit of lower computational complexity than the full-rank approach, Numerical simulations in flat fading and multi-path fading channels are offered in this paper. The results show that the proposed algorithm is superior in convergence performance and more robust against the signaling waveform mismatch than the full-rank one.

关 键 词：盲多用户检测 DS/CDMA MAI RLS滤波算法 收敛性分析 

分 类 号：TN92[电子电信—通信与信息系统]