引入阈值和判决指导的DFT信道估计算法  

DFT-based channel estimation method with threshold and direct-decision

作　　者：杨晋生[1] 熊积慧[1] 

机构地区：[1]天津大学电子信息工程学院,天津300072

出　　处：《系统工程与电子技术》2012年第2期375-378,共4页Systems Engineering and Electronics

基　　金：国家新一代宽带无线移动通信网科技重大专项(2010ZX03005-001-01)资助课题

摘　　要：针对传统的基于离散傅里叶变换(discrete Fourier transform,DFT)的信道估计算法中滤噪性能不够理想的问题,提出了一种在正交频分复用(orthogonal frequency division multiplexing,OFDM)系统中引入阈值和判决指导的DFT信道估计算法,采用阈值法对噪声进行两次降噪处理。仿真结果表明,该算法在高信噪比和低信噪比下均可提高信道估计的性能,其归一化均方误差(normalized mean square error,NMSE)指标优于传统算法。To solve the insufficient ideal filtering in the traditional channel estimation （CE） algorithm based on discrete Fourier transform （DFT）, a novel CE algorithm based on DFT with the threshold and direct decision in orthogonat frequency division multiplexing （OFDM） system is proposed, which filters out noise twice by the threshold-based CE method. Simulation results show that the proposed algorithm can improve the performance of CE at both high and low signal to noise ratios and the normalized mean square error （NMSE） is better than the traditional algorithms.

关 键 词：信道估计 离散傅里叶变换 阈值 判决指导 正交频分复用 

分 类 号：TN911.23[电子电信—通信与信息系统]