中文说明：本程序实现了ofdm调制，包括QPSK调制，串并变换，ifft调制，上采样，低通滤波器，然后经过信道传输，再经过低通滤波器滤除多余噪声，下采样，FFT解调，并串变换，QPSK解调，完成了用MATLAB实现OFDM仿真的全过程
English Description：
The program OFDM modulation, including QPSK modulation, and series-parallel transformation, IFFT modulation, sampling, low-pass filter, and channel, and then through the low-pass filter to filter out unwanted noise, sampling and FFT demodulation, and strings transform, QPSK demodulation, through the process of the OFDM simulation using MATLAB