天线阵CDMA系统基于子空间的盲辩识与多用户检测

Blind Identification and Multiuser Detection Based on Subspace in Antenna Arrays Systems

针对天线阵 CDMA系统 ,运用子空间方法 ,导出了用户多径信道的盲辩识过程 .并证明在此基础上 ,结合待检用户的扩频序列 ,在几乎不增加任何额外运算量的情况下 ,就可过渡到多用户检测 .尽力避免了对高维矩阵的直接运算 ,计算量大大降低 .采用天线阵方法适于过载系统 (系统用户数≥处理增益 )

A blind identification process of each user' multipath channel using a subspace method for antenna arrays CDMA systems is presented. It is shown that based on the identified channel and combined with the knowledge of the desired user' spreading sequence, multiuser detector can be constructed in closed form, at almost no extra computational cost. Because the computing of some high dimension matrices has been avoided directly, the computation complexity becomes lower. By using antenna arrays, the proposed method can be applied to overload systems, where the number of users may exceed the processing gain.