中文说明：实现OFDM的MATLAB系统仿真，发送序列设定为随机二进制比特流，子载波数设定为128，一帧中的OFDM符号数为6，信道设置为高斯白噪声信道，结果比较了发送和接收序列欠40bit的正误，收发端的QPSK星座图映射。
English Description：
The MATLAB system simulation of OFDM is realized. The transmitting sequence is set as random binary bit stream, the number of subcarriers is set as 128, the number of OFDM symbols in a frame is 6, and the channel is set as Gaussian white noise channel. The results show that the transmitting and receiving sequences are less than 40 bits, and the QPSK constellation map of the receiver is compared.