可见光通信OFDM系统抗多径干扰性能研究

Research on multipath interference mitigation capability of VLC-OFDM system

研究可见光通信OFDM系统在多径衰落信道中的传输性能。分别使用16-QAM和OFDM调制对声音和文本信源在多径衰落信道中进行传输，比较不同调制方式的传输效果。传输文本文件时，分析了误码率随衰落系数以及路径时延变化的关系。结果表明：可见光通信OFDM系统在多径衰落信道中传输，能克服多径效应，降低误码率，获得较为满意的通信质量。

In the system of Visible Light Communication （VLC） using OFDM, we study the transmission ef- fects in multipath fading channels. We transmit audio file and text file in multipath fading channels by 16-QAM and OFDM respectively, comparing the bit error rate （BER） between 16-QAM and OFDM. When transmitted the text file, the variation of the BER with fading coefficient and path delay value were analyzed respectively. The results showed that VLC-OFDM system in multipath fading channels can mitigate multipath effects, reduce the BER and obtain more satisfactory communication quality.