有一种直接基于DFT的信道估计方法利用均匀梳状分布的导频符号和离散傅立叶变换（DFT）完成信道估计。

The direct DFT based channel estimation method uses comb-type pilot symbol and discrete Fourier transform (DFT) to estimate the channel.

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同时，针对梳状导频ls信道估计精度较低的情况，提出了通过时域低通滤波提高其估计精度的IPF - LS和IDF - LS改进算法。

Meanwhile, given the weak accuracy of LS algorithm, IPF-LS and IDF-LS are proposed which can enhance the accuracy of channel estimation by employing time-domain low-pass filter.

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