由于少有多基色的白光 LED, 传统波分复用 (Wavelength Division Multiplexing, WDM)可见光通信 (Visible Light Communication, VLC)系统仅拥有 R、G、B三个通道。针对 VLC中 WDM技术的应用受到白光 LED器件限制的问题, 本文提出了一种多光谱混光通信方法。该方法根据 LED光源颜色特性、多脉冲位置调制特点和混光方式, 设计出针对各通道 LED光源的多脉冲位置调光调制方案, 将色域和时域统一, 在多通道通信的同时实现白光输出。本文利用 4种单色 LED设计出多光谱混光通信验证系统。实验结果表明, 系统在 4路并行通信的同时, 输出白光色温 5 500 K, 色差小于人眼分辨范围 (CIE1976色坐标体系 Δu′v′小于 0.005), 多光谱混光通信是可行的。

Since rare multi-primary white LED, traditional Wavelength Division Multiplexing (WDM) visible light communication (VLC) system only has R, G, B three channels. In view of the WDM technology restricted by white LED device in VLC, a method of multispectral mixed light optical communication is proposed. According to the color characteristic of LED light, feature of multi-pulse position modulation (MPPM) and the approach of mixing light, a MPPM dimming modulation is designed for each channel, which uniforms the color and time domain that can realize communication and white light output in the meantime. A multispectral mixed light optical communication system is built using four single-color LEDs. The experimental results show that a white color, 5500K color temperature, is obtained when four channels parallel communication, and chromatic aberration is indecipherable for human eyes (CIE 1976 Δu′v′<0.005). Multispectral mixed light optical communication is feasible.