说明：  这个是关于OFDM系统的信道估计的算法的两种方法,分别是OFDM的最小二乘和最小均方误差估计的仿真程序代码
(This is a two-way method of an algorithm for channel estimation of an OFDM system, which is a simulation program code of the least-square and least-mean-square error estimates of OFDM, respectively)