基于信道探测技术的MIMO-OFDM系统信道及其相关性的联合估计  

Joint estimation of MIMO-OFDM channel and its correlation based on channel sounding

作　　者：屠佳[1] 杨炜伟[1] 蔡跃明 徐友云[1] 

机构地区：[1]解放军理工大学通信工程学院,江苏南京210007

出　　处：《解放军理工大学学报（自然科学版）》2010年第6期585-589,共5页Journal of PLA University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(60972051);国家科技重大专项基金资助项目(2010ZX03006-002-04);江苏省自然科学基金资助项目(BK2010101)

摘　　要：在实际物理环境中,信道相关性估计在很大程度上影响信道估计的准确性。针对MIMO-OFDM系统,引入信道探测思想,在数据传输之前发射探测信号,利用接收端信号的相关矩阵与信道相关矩阵的关系进行信道及其相关性的联合估计,同时,将信道探测得到的信道相关矩阵作为数据传输过程中的已知条件,辅助系统进行信道估计。理论分析和仿真表明,该方法可以在空间相关性不能忽略的情况下保证信道估计的准确度,基于信号处理的估计方法也不会增加算法的复杂度,同时信道探测思想的使用,不会造成数据传输过程中占用额外系统带宽的现象,因此具有较大的实用价值。In the practical physical environments,to a large extent,the accuracy of channel estimation is influenced by the channel correlation estimation.Aiming at MIMO-OFDM system,the idea of channel sounding that sending sounding signal before data transmission was introduced,and the joint estimation of the channel and its correlation were done based on the relationship between the correlation matrix of the received signal and that of the channel.Meanwhile,the correlation matrix of the channel gained from the channel sounding could be used to assist the system to do the channel estimation as a known condition during the data transmission.Theory analysis and simulation results show that this algorithm guarantees the accuracy of the channel estimation when the channel space correlation can not be ignored,that the estimation algorithm based on signal processing will not increase the complexity of the algorithm,that it doesn＇t occupy the system bandwidth during data transmission using the idea of channel sounding,and that this algorithm has the most application value in practice.

关 键 词：多输入多输出—正交频分复用 信道探测 空间相关性 信道估计 噪声方差 

分 类 号：TN911.23[电子电信—通信与信息系统]