OFDM系统中一种基于LMMSE的半盲信道估计算法  

Improved semi-blind channel estimation algorithm based on LMMSE for OFDM system

作　　者：周洁[1] 赵晓晖[1] 林高三[1] 

机构地区：[1]吉林大学通信工程学院信息科学实验室,长春130012

出　　处：《吉林大学学报（工学版）》2009年第2期508-513,共6页Journal of Jilin University:Engineering and Technology Edition

基　　金：吉林省科技发展计划项目(20050521)

摘　　要：为克服信道冲激响应长度大于导频数时出现系统性能下降,适应存在大量多径的恶劣信道环境,本文对OFDM系统基于MLE的半盲信道估计算法进行了改进。该算法采用非均匀间隔导频排列方式以获得更小的系统均方误差。通过简化导频数提高了系统频带利用率,利用奇异值分解进一步简化了算法复杂度。仿真结果表明:如充分利用信道统计信息,在导频数目很少、信道长度很大和低信噪比时,本文提出的算法能够以较低复杂度实现精确的信道估计,从而验证了该算法的有效性和优越性。In order to overcome the disadvantages of system performance degradation on the condition of pilot numbers smaller than channel impulse length and bad channel environment in many paths,an improved semi-blind channel estimation algorithm based on MLE for OFDM system was presented.The proposed algorithm can reach small system mean square error with non-uninformed pilots.And by the reduction of pilot numbers,frequency resource of the system is increased.In addition,with singular value decomposition,the algorit...

关 键 词：通信技术 半盲信道估计 OFDM系统 LMMSE SVD 非均匀间隔导频 

分 类 号：TN919.3[电子电信—通信与信息系统]