中文说明：利用MATLAB软件对OFDM系统做出仿真。仿真中采用QPSK调制技术，并加入高斯白噪声，最终得到QPSK星座映射图以及BER曲线图。由仿真结果可以看出，OFDM在高斯信道具有良好的抗噪声性能，误码率较低。
English Description：
The OFDM system is simulated by MATLAB. QPSK modulation technology is used in the simulation, and Gaussian white noise is added to get QPSK constellation map and BER curve. The simulation results show that OFDM has good anti noise performance and low bit error rate in Gaussian channel.