窄带MIMO信道最大似然估计的误差  

Accuracy of maximum likelihood estimation for narrowband MIMO channel

作　　者：武俊[1] 陈曦[2] 王浩刚[1] 皇甫江涛[1] 

机构地区：[1]浙江大学信息科学与工程学院,浙江杭州310027 [2]东南大学毫米波国家重点实验室,江苏南京210096

出　　处：《浙江大学学报（工学版）》2008年第11期1920-1925,共6页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(60501017)

摘　　要：采用最大似然估计(MLE)准则求解窄带多入多出(MIMO)信道矩阵,并对码同步和最大似然估计进行了严格的推导.基于Matlab/Simulink信道测量仿真系统搭建了MIMO仿真平台,并给出了软件仿真系统的信道测量结果.误差分析结果表明,由硬件采样率决定的码同步误差制约信道估计的精度;为保证相位估计的精度,中频提取的频率误差必须限制在一定的范围内;当信干噪比性能较好时,码同步误差超越信干噪比成为制约信道估计性能的主因.Maximum likelihood estimation （MLE） method was applied to the narrowband multiple input and multiple output （MIMO） channel matrix. Code synchronization and MLE were full-scale derived as well. One MIMO simulating platform was set up based on the channel measurement simulating system in Matlab/Simulink, based on which the relevant measurement results were provided. According to the accuracy of MLE, the error analysis results of the channel measurement showed that the error of code synchronization, limited by the hardware sampling rate, decides the precision estimation of channel conditions; the intermediate frequency recovery must be restricted to guarantee the precision estimation of phase; code synchronization, rather than signal to interference plus noise ratio （SINR）, mainly decides the estimation of channel conditions when the SINR is sufficiently high.

关 键 词：MIMO 最大似然估计 无线信道 信道测量 

分 类 号：TN911.23[电子电信—通信与信息系统]