MIMO-OFDM系统中空载波对信道估计和系统性能的影响  

The Influence of Virtual Carriers on Channel Estimation and System Performance in MIMO-OFDM Systems

作　　者：李凌宇[1] 杨晨阳[1] 

机构地区：[1]北京航空航天大学电子与信息工程学院203教研室,北京100083

出　　处：《信号处理》2009年第2期174-179,共6页Journal of Signal Processing

摘　　要：本文分析了有空载波的OFDM系统利用信道响应长度信息进行时域滤波时信道估计算法的性能,推导了有信道估计误差时MIMO-OFDM系统BER的解析式,对具有不同训练序列结构的MIMO-OFDM系统通过数值方法分析了信道估计算法对其BER的影响。研究结果表明,在有空载波的单发单收(SISO)OFDM系统中,时域滤波信道估计算法不会影响BER性能;而在有空载波的MIMO-OFDM系统中,当采用某些训练序列结构时会严重影响BER。In this paper, the performance of time domain filtering channel estimation algorithm utilizing the information of channel response length in OFDM systems with virtual carriers is analyzed. The bit error rate is derived for MIMO-OFDM systems with channel estimation error. The influence ＇of the time domain filtering channel estimation algorithm on BER is studied through numerical analysis for MIMO-OFDM systems with different training sequence structures. It＇ s shown that the time domain filtering channel estimation algorithm doesn＇t degrade the BER in SISO-OFDM system. However, the BER of MIMO-OFDM systems will be considerably influenced when some training structure is used.

关 键 词：多发多收 正交频分复用 空时块编码 信道估计 空载波 

分 类 号：TN92[电子电信—通信与信息系统]