说明：  文章介绍了OFDM 系统中插入导频的Ls信道估计与MMSE信道估计两种算法，通过试验 仿真说明了MMSE信道估计算法对系统性能的提升要优于Ls信道估计算法，但MMSE信道估计算法的 计算量大于LS信道估计算法。
(This paper introduced the MMSE and LS of pilot based channel estimation in the OFDM system，the expert。一 ment shows that the MMSE channel estimation algorithm is superior to the LS channel estimation algorithm in improvement of the system，but the MMSE algorithm has more complicated algorithm．)