基于DFT算法的OFDM信道估计研究

Research on Ofdm Channel Estimation Based on Dft Algorithm

本文研究了DFT信道估计算法并对该算法进行了改进,首先将信号在频域转换到时域,然后将时域中循环前缀长度之外的信道估计值置零。同时对循环前缀之内,也就是n≤L_G-1的信道估计值做进一步的处理,以便进一步消除噪声的干扰。通过计算机仿真验证了改进的DFT算法优于原算法。

An improved DFT channel estimation algorithm is presented in this paper.In this algorithm,the frequency domain channel estimation is converted to time domain,then the channel estimation value besides the cyclic prefix length towards to zero in time domain.In addition,further processing had to be done to the channel estimation value within the cyclic prefix length,which is less than or equal（Lg-1） in order to eliminate noise interference.A better performance of the new algorithm is gained by computer simulation.