无线OFDM系统中基于导频的信道估值器的比较分析  

A comparative study of pilot-based channel estimators for wireless OFDM

作　　者：徐发强[1] 益晓新[1] 

机构地区：[1]解放军理工大学通信工程学院无线通信系,江苏南京210016

出　　处：《通信学报》2001年第5期17-23,共7页Journal on Communications

基　　金：国防科技重点实验室基金资助项目! (OOJS0 4 .5.1;JB380 2 )

摘　　要：本文对无线OFDM系统中基于导频的信道估值器进行了比较分析 ,对比了四种估值器在均方误差 (MSE)上的性能。本文针对时频两维的信道估值 ,分别分析了时频分离和时频不分离两种处理方法。文中还讨论了信道估值的低阶近似算法 ,并进行了给定复杂度下不同估值器的性能对比。结果表明 ,在相同的复杂度下 ,使用时频分离的估值器比时频不分离的估值器性能要好 ,分离估值器经过低阶近似 ,性能得到了进一步的提高。This report deals with pilot-based channel estimation in wireless OFDM systems.Four estimators are compared in terms of mean-squared error.The channel estimation is a two-dimensional problem(time and frequency),and both separable and non-separable estimators are investigated.We also discussed low-rank approximations of these estimators and compared their performance at a given complexity.The comparison shows that the use of separable estimators increases the performance substantially,compared to non-separable estimators with the same complexity.For the scenario investigated in this report the performance is further improved by applying low-rank approximations to separable estimators.

关 键 词：正交频分复用 信道估值 维纳滤波器 无线通信 

分 类 号：TN92[电子电信—通信与信息系统] TN914[电子电信—信息与通信工程]