基于路径搜索的最小二乘OFDM信道估计算法

LS OFDM Channel Estimation Based on Path Searching

提出了一种基于导频的OFDM信道估计算法,该算法利用最小平方误差准则搜索时域信道的多径时延,通过最小二乘算法计算路径增益,经傅里叶变换得到频域信道估计。提出了一种串行路径搜索算法,能够大大减少路径搜索的计算量。仿真结果表明在低信噪比条件下路径搜索算法仍然能够有效地工作,并指出搜索路径数量应当设置为等于或者大于实际信道的多径数。

A novel pilot-aided channel estimation algorithm for the OFDM system is proposed. Multipath delays in the time domain are searched based on the least square （LS） criteria and path gains are estimated using the LS estimation algorithm. Frequency channel coefficients are obtained through the Fourier transform. A serial path searching algorithm is proposed to reduce the computation of path searching. Estimation results in the HF OFDM communication system show that the path searching algorithm can effectively work under the low SNR condition. The influence of the searching path number is evaluated and it must be set equal to or more than the multipath number of real channel.