一种改进的双对角阵线性最小均方误差信道估计算法  

An Improved DDLMMSE Algorithm for Channel Estimation

作　　者：白媛[1,2,3] 高培方 马秀荣[1,2] 李奇[1,2] 

机构地区：[1]天津理工大学计算机与通信工程学院光电器件与通信技术教育部工程研究中心,天津300384 [2]天津理工大学薄膜电子与通信器件天津市重点实验室,天津300384 [3]桂林电子科技大学广西可信软件重点实验室,桂林541004

出　　处：《科学技术与工程》2014年第35期232-236,共5页Science Technology and Engineering

基　　金：天津市科技创新专项资金项目(10FDZDGX00400);广西可信软件重点实验室;(kx201332)资助

摘　　要：提出一种不同宽度的双对角阵线性最小均方误差(dual-diagonal linear-minimum-mean-square-error,DDLMMSE)信道估计算法。该算法在DDLMMSE信道估计算法的基础上,利用相邻子载波间的相关性,将DDLMMSE算法中的对角阵扩展为K重对角阵,在不显著增加算法复杂度的前提下,提高了DDLMMSE信道估计算法的估计精度。仿真结果表明,与DDLMMSE算法相比,当正交频分复用(orthogonal frequency division multiplexing,OFDM)子载波数为128时,获得相同的误码率BER=10-1时,宽度为3的DDLMMSE算法所需的信噪比约有0.5 d B的减小,可以根据性能要求选择合适的宽度。A novel different-width dual diagonal linear minimum mean square error algorithm for channel esti- mation is proposed. Based on the DDLMMSE criterion, the algorithm uses the correlation of the neighbouring sub- carriers, the diagonal matrix having being expanded to K-diagonal, the estimation accuracy of DDLMMSE algorithm has been improved without increasing complexity seriously. It is proved by simulation that compared with the DDLMMSE algorithm, 3-width DDLMMSE algorithm can achieve the same performance of BER = 10-1 within 0.5 dB lower level＇ s SNR.

关 键 词：OFDM 信道估计DDLMMSE 不同宽度DDLMMSE 

分 类 号：TN91[电子电信—通信与信息系统] TN92[电子电信—信息与通信工程]