说明：  matlab环境下，采用802.11a系统物理层参数，一个长训练字与6个OFDM符号构成一帧，瑞丽信道，多普勒100Hz，采用QPSK调制，接收端估计误比特率
(matlab environment, using 802.11a physical layer parameters, a word with six long training OFDM symbols of a frame, Ruili channel, Doppler 100Hz, using QPSK modulation, the receiver estimates the bit error rate)