基于DFT与FEC迭代的OFDM系统信道估计  

Channel Estamation in OFDM Systems based on DFT and FEC Iterations

作　　者：金文杰[1] 刁盛锡[1] 张迪[1] 高飞[1] 

机构地区：[1]华东师范大学信息科学技术学院,上海200241

出　　处：《通信技术》2016年第9期1115-1121,共7页Communications Technology

摘　　要：在OFDM系统中,常见的信道估计方法有基于DFT的信道估计和基于维纳滤波的信道估计。传统的DFT信道估计对于最大时延内的噪声不能很好地抑制,而维纳滤波信道估计需要知道信道的相关特性。因此,介绍传统的DFT和维纳滤波的信道估计方法,并基于此提出一种DFT和前向纠错码(FEC)迭代的信道估计方法。该信道估计方法利用前向纠错码的性能来修正信道估计的结果,以降低误码率。实验仿真证明,该方法能够有效提升信道估计的性能。In OFDM systems,DFT-based method and wiener filter-based method are the common channel estimation methods.Conventional DFT-based algorithm couldn＇t fairly suppress the noise in the maximum time-delay, while the wiener fiher-based method requires the knowing of channel correlation in advance. With the introduction of DFT-based and wiener filter-based methods, a novel channel estimation method based on DFT and FEC（Forward Error Correction） iterations is proposed, and this method makes use of FEC performance and amends the results of DFT-based estimation, and thus reduces the bit error rate.Simulation results indicate that the proposed method could improve the performance of channel estimation

关 键 词：OFDM 信道估计 DFT 前向纠错码 

分 类 号：TN911.5[电子电信—通信与信息系统]