基于维纳滤波的二维联合信道估计的实现  

Implementation of OFDM channel estimation based on two-dimension Weiner filting

作　　者：刘春娟[1] 钱良[1] 

机构地区：[1]上海交通大学无线通信研究所,上海200240

出　　处：《信息技术》2008年第5期27-30,39,共5页Information Technology

基　　金：国家自然科学基金资助项目(60332030)

摘　　要：在OFDM系统中,基于导频的信道估计是工程实现中应用最广泛的估计方法。其中,二维维纳(Weiner)滤波器是最小均方误差意义上的最佳线性估计器。文中给出了维纳滤波二维联合信道估计的一种实现方法,采用一种按噪声方差分区间处理,非实时的计算滤波参数的方式。仿真结果表明,该方法的误码性能逼近理想信道估计性能,并较之两个级联的一维线性内插有明显的改善。同时给出了该算法在BF561上的实现,与常用的FPGA实现方案相比,算法在保持定点性能的同时,提供了灵活的编程能力和良好的可扩展性。In OFDM systems, the pilot-symbol-aided channel estimation is the most widely used method in project implementation, and the two-dimension Weiner filter is the best linear estimator according to MMSE criterion. An implementation method of OFDM channel estimation based on two-dimension Wefiner tilting is given in this paper, in which several coefficients of Weiner filter are calculated off-line, and when it is used on-line they are chosen according to the estimated channel noise variance range. From the matlab simulation result, this method＇s BER performance is approaching the ideal estimation, and obviously better than two-cascaded one-dimension linear interpolation. An implementation of the method on the BF561 platform is also given.

关 键 词：OFDM 信道估计 维纳滤波 BF561 

分 类 号：TN911[电子电信—通信与信息系统]