OFDM系统中基于分组导频的迭代信道估计算法  

Iterative channel estimation based on block-type pilot-assisted for OFDM systems

作　　者：蒋琦[1] 赵春明[1] 王家恒[1] 

机构地区：[1]东南大学移动通信国家重点实验室,江苏南京210096

出　　处：《通信学报》2006年第5期28-34,共7页Journal on Communications

基　　金：国家自然科学基金资助项目(60496311)~~

摘　　要：对OFDM系统中由于信道的时变性产生的载波间干扰进行了分析,并在此基础上提出了一种分组导频结构的DFT迭代信道估计算法。与原有的信道估计算法相比,此种算法不仅在一般的信道条件下具有良好的性能,而且更加适合快变信道条件下的OFDM系统。仿真结果表明:提出的OFDM信道估计算法不仅可以给出精度较高的信道信息,而且近似达到理想信道估计的性能。The inter-carrier interference caused by time-variant fading channels in OFDM systems was analyzed and a novel block-type pilot-assisted iterative channel estimation algorithm based on DFT was proposed. The proposed algorithm, compared with the conventional algorithms, could provide more accurate channel information not only in slowly time-variant environments, but more important also in fast time-variant environments. The simulation results show that the proposed algorithm can nearly achieve the performance as good as the perfect channel estimation in both slowly and fast time-variant fading channels.

关 键 词：载波间干扰 快变信道 迭代信道估计 理想信道估计 

分 类 号：TN911.5[电子电信—通信与信息系统]