基于STBC的MIMO-OFDM系统信道估计方法比较  

Comparison of channel estimation methods for STBC-OFDM system

作　　者：刘汉奎[1] 王云秀[1] 郝希准[1] 

机构地区：[1]西华师范大学物理与电子信息学院,南充637009

出　　处：《西南民族大学学报（自然科学版）》2012年第3期416-419,共4页Journal of Southwest Minzu University(Natural Science Edition)

基　　金：四川省教育厅重点项目(11ZA038)

摘　　要：针对基于STBC的两发一收MIMO-OFDM系统的信道估计,通过最小化均方差,得到了相移导频辅助方法的优化截断值.给出了在不同信噪比下,用常规梳状导频和相移导频方法进行信道估计得到的均方差随多普勒频移的变化情况.仿真结果表明,在高信噪比时,相移导频方法有更好的抗多普勒频移性能;当多普勒频移为200Hz,信噪比为20dB以上时,相移导频方法得到的系统误符号率明显小于常规梳状导频方法.In order to investigate the channel estimation of MIMO-OFDM with two transmitter antennae and one receiver antenna, an optimized cut-off value is obtained for the phase-shift pilot method through minimizing the mean square error （MSE）. For the conventional comb-type pilot method and phase-shift pilot method, the change of MSE with the Doppler frequency shift is present under different signal-to-noise ratio （SNR）. The simulation results indicate phase-shift pilot method performs better anti-Doppler shift than the conventional comb-type pilot if the SNR is higher. In addition, as for the Doppler frequency shift of 200Hz, the symbol error rate （SER） obtained by phase-shift pilot method is obviously lower than the conventional comb-type pilot method if the SNR is above 20dB.

关 键 词：正交频分复用 多输入多输出 空时分组编码 信道估计 

分 类 号：TN91[电子电信—通信与信息系统]