一种基于叠加导频的OFDM系统迭代信道估计算法

摘要

提出了一种在OFDM系统中,基于叠加导频和时域最小平方准则的迭代信道估计算法,该算法利用多个OFDM符号进行联合信道估计,且在接收端根据估计得到的信道信息实时地更新发送序列,采用反馈迭代算法不断地更正信道信息,有效地提高了信道估计性能.%In this paper, a new orthogonal frequency division multiplexing (OFDM) channel estimation was proposed. This method was an iterative channel estimation algorithm based on the least-squares criteria using superimposed pilot in time-domain, and the algorithm got effectively use of multiple OFDM symbols for joint channel estimation, and at the receiving end, according to the estimated channel information update real-time transmitted sequence, and then continue to correct channel information for feedback of iterative algorithm, the proposed scheme improved channel estimation performance greatly through computer simulation.