基于802.16d的OFDM导频信道估计  

Pilot-Symbol-Aided Channel Estimation for OFDM Systems Based on 802.16d

作　　者：王忠[1] 薛伟[1] 

机构地区：[1]四川大学电气信息学院,成都610065

出　　处：《华东理工大学学报（自然科学版）》2009年第4期634-638,共5页Journal of East China University of Science and Technology

基　　金：国家自然科学基金资助项目(49901013);中国博士后基金资助项目

摘　　要：以基于导频的信道估计展开研究。首先总结一般无线信道的多径时变统计特性,给出SUI-3信道模型的仿真实现。在此基础上,研究现有的块状导频插入方式下信道估计算法的原理和性能。基于Alamouti空时编码方案,构建1种具有2个发射天线和1个接收天线的时-频空时编码的正交频分复用(OFDM)系统,提出适用于虚载波系统的基于DFT变换的信道估计算法。该方法利用DFT迭代算法来重构虚载波的频域信道状态信息,通过时域滤波方法来抑制噪声。仿真结果表明:该算法实现了良好的信道估计性能,有效可行。The channel estimation based on pilot was studied in this paper. Multi-path and timevarying statistic properties of general wireless channel were summarized. The properties of channel were analyzed, giving simulation of the SUI-3 channel models. Based on this analysis, the principles and performances of the existing channel estimation methods in block-type pilot arrangements were investigated. Based on Alamouti＇s space-time coder design, a wireless OFDM system with only one receiver antenna to wireless OFDM system with two transmitters was established. An algorithm to implement channel estimation, DFT-based channel estimator at virtual carriers system, was proposed. The channel status information was reconstructed by the new algorithm according to a DFT iterative algorithm. Then the channel noise was suppressed by time domain filter methods. The results of simulation show that the method can estimate channel well. The method is proved to be effective and feasible.

关 键 词：正交频分复用(OFDM) 无线信道 衰落 仿真 

分 类 号：TN929.531[电子电信—通信与信息系统]