说明：  基础的 DCO-OFDM可见光通信matlab代码。采用QPSK调制，AWGN信道不需要均衡（如果是瑞利需要添加均衡）
(DCO-OFDM visible light communication MATLAB code. With QPSK modulation, the AWGN channel does not require equalization (if John William Strutt, 3rd Baron Rayleigh needs to add equalization))