V-BLAST OFDM系统的频率选择性信道盲估计  

Blind estimation of frequency-selective channels for V-BLAST OFDM system

作　　者：吴晓军[1] 李星[1] 王继龙[1] 

机构地区：[1]清华大学信息科学技术学院,北京100084

出　　处：《通信学报》2004年第10期93-101,共9页Journal on Communications

基　　金：国家"973"计划基金资助项目(2003CB314807);中国博士后科学基金资助项目(2003034164)

摘　　要：研究下行频率选择性衰落环境中垂直分层空时正交频分复用(V-BLAST OFDM)系统的信道盲估计问题。为 V-BLAST OFDM 系统提出了一种新颖的贴标签型延迟分集结构。该结构能够巧妙赋予 V-BLAST OFDM 系统以旋转不变性性质。利用上述旋转不变性,进一步为下行V-BLAST OFDM 系统提出了一种多输入多输出(MIMO)频率选择性无线信道的盲估计方法。仿真结果表明了新颖贴标签型延迟分集结构的有效性和信道盲估计方法的性能。The blind estimation problem of channels was investigated for the combining form of the vertical Bell Labs layered space-time (V-BLAST) architecture and the orthogonal frequency-division multiplexing (OFDM) technique, i.e. the V-BLAST OFDM system, under the downlink frequency-selective fading environment. One novel labeled delay diversity structure was proposed for the V-BLAST OFDM system, which could elegantly introduce the rotational invariance property into the V-BLAST OFDM system. By exploiting the above rotational invariance property, one blind estimation scheme of multiple-input multiple-output (MIMO) frequency-selective fading wireless channels was derived for the downlink V-BLAST OFDM system. Simulation results demonstrate the validity of the novel labeled delay diversity structure and the performance of the blind estimation scheme of channels.

关 键 词：通信与信息系统 频率选择性衰落信道盲估计 贴标签型延迟分集 垂直型贝尔实验室 分层空时结构 正交频分复用 

分 类 号：TN911.72[电子电信—通信与信息系统] TN929.5[电子电信—信息与通信工程]