 结合理论课讲解基于Matlab仿真OFDM信号，绘制OFDM符号星座图，时域、频域曲线；
 绘制发送端、接收端低通滤波器的幅频特性；
分析AWGN信道条件下OFDM系统的误码率性能(　combined with the theory of lesson based on Matlab simulation OFDM signal, drawing OFDM symbol constellation, time domain, frequency domain curve
　draw the transmitter, receiver low-pass filter amplitude and frequency characteristics
Analysis of Bit Error Rate Performance of OFDM System under AWGN Channel)