OFDM系统中基于导频的信道估计最优化分析

Optimization Analysis on Pilot-based Channel Estimation in OFDM System

近年来,正交频分复用(OFDM)技术已被越来越多的人所关注,并且在IEEE 802.11无线局域网中得到实际应用.在OFDM系统中一般要进行信道估计,从最小平方误差准则(Least Square Error Law)和最小均方误差准则(Minimum Mean Square Error Law)两个方面对基于梳状导频的信道估计方法进行了分析,并给出了仿真结果.结果表明,采用MMSE准则比采用LS准则所得到的误码性能要好.

Recently orthogonal frequency division multiplexing（OFDM） has received more and more attention and has been applied to IEEE 802.11 wireless LAN.The channel estimation in OFDM system was applied usually.In this paper,the mothods of comb pilot based channel estimation with both Least Square Error（LSE） law and Minimum Mean Square Error（MMSE） law were analysed,its simulation result were given.The results show that MMSE law is outper forms LS low in bit error rate（BER）.