说明：  In this Mfile, I want to investigate the performance of LSE algorithm in OFDM channel estimation with methods of equalizations like MRC and ZF. For further information see the "Xiaodong Cai and Georgios B. Giannakis, Error Probability Minimizing Pilots for OFDM with M-PSK Modulation over Rayliegh-Fading Channels,” IEEE Transactions on Vehicular technology, vol. 53, No. 1, pp 146-155, Jan. 2004.