MIMO-OFDM系统中的采样钟频率偏移估计  

Sample frequency offset estimation in MIMO-OFDM systems

作　　者：郭漪[1] 刘刚[1] 葛建华[1] 

机构地区：[1]西安电子科技大学综合业务网国家重点实验室,陕西西安710071

出　　处：《华中科技大学学报（自然科学版）》2006年第12期27-29,共3页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家高技术研究发展计划资助项目(2003AA123320);国家自然科学基金资助项目(60332030)

摘　　要：分析了采样钟频率偏移对MIMO-OFDM系统接收信号的影响,提出了一种适用于MIMO-OFDM系统的采样钟频率偏移估计算法,即幅度加权最小平方估计法.该算法根据最小平方准则,利用两个完全相同的训练符号在相同子载波上的相位差来估计采样钟频率偏移.为了提高算法在瑞利衰落信道下的性能,进一步采用了幅值加权的方法.仿真结果表明,该方法无论在高斯、莱斯还是瑞利信道下均能取得良好的性能.The effect of sample frequency offset was exploited on multi-input multi-output orthogonal frequency-division multiplexing （MIMO-OFDM） signals. Is presented an amplitude weighted least squares estimation of sample frequency offset in MIMO-OFDM systems. Based on the Linear Least Squares criteria, this algorithm makes use of the phase difference at the same sub-carriers within two identical pilot symbols. To improve the performance of the algorithm in the rayleigh fading channel, amplitude weighted algorithm is adopted, The analysis and the simulation results show that the algorithm performs well in the gauss channel or the rieian fading channel or the rayleigh fading channel.

关 键 词：多输入多输出-正交频分复用 采样钟频率偏移 幅度加权最小平方估计 

分 类 号：TN913[电子电信—通信与信息系统]