OFDM系统中基于DFT的信道估计方法

摘要

A channel estimation based on block DFT interpolation algorithm is proposed for comb-type pilot in OFDM systems for HF communication.The algorithm is improved by using the data-flipping idea in order to reduce the impact of edge effect in high SNR conditions on the performance of algorithm and improve the estimation precision of algorithm under the condition of high SNR.The simu-lation results show that the proposed interpolation channel estimation algorithm has less amount of calculation and higher channel esti-mation precision,compared with traditional algorithm.%针对采用梳状导频的正交频分复用（ OFDM）短波通信系统，提出一种基于分块离散傅里叶变换（ DFT）的信道估计内插算法，并运用数据翻转思想对算法进行改进，减小所提算法产生的边缘效应在高信噪比条件下对算法性能的影响，提高在高信噪比条件下所提算法的估计精度。仿真结果表明，该信道估计内插算法较传统算法计算量有所减小，信道估计精度略有提高。