基于子空间-斜投影的MIMO-OFDM盲信道估计算法  

Blind Channel Estimation Algorithm of MIMO-OFDM Based on Subspace-oblique Projection

作　　者：张鏖烽[1] 

机构地区：[1]湖南工程学院计算机与通信学院,湘潭411104

出　　处：《湖南工程学院学报（自然科学版）》2014年第4期35-37,共3页Journal of Hunan Institute of Engineering(Natural Science Edition)

基　　金：湖南省科技计划资助项目(2014GK3117)

摘　　要：信道估计是MIMO-OFDM系统的关键技术,相比非盲信道估计而言,盲估计技术具有带宽利用率高,系统传输效率高的优点.基于子空间盲估计算法在信道变化不是很快的情况下有比较精确的估计效果,但是多径衰落、噪声等会引起子空间之间的非正交,从而导致估计性能急剧恶化,此时采用斜投影可以很好的解决这个问题,仿真结果表明子空间——斜投影算法对信道估计性能有明显的提高.Channel estimation is the key technology of MIMO-OFDM system. Compared with non-blind es- timation, blind estimation has higther bandwidth utilization and better transmission efficiency. Blind esti- mation of subspace has more accurate effect when channel changes slowly, but the multipath fading and noises may cause the nonorthogonal between subspaces, which leads to estimation effect deteriorating sharply. The study shows that the oblique projection can solve this problem effectively, The simulation re- suits show that blind estimation based on subspace-oblique projection can improve the estimation perform- ance significantly.

关 键 词：子空间 斜投影 MIMO-OFDM 盲估计 

分 类 号：TN92[电子电信—通信与信息系统]