中文说明：
对信道估计技术进行仿真，包括基于LS的信道估计、基于LMMSE的信道估计，以及在加入DFT后两种算法对应误码率和均方误差性能比较的仿真。
English Description：
The channel estimation technology is simulated, including LS based channel estimation, LMMSE based channel estimation, and the simulation of BER and MSE performance comparison of the two algorithms after adding DFT.