提出一种新的室内可见光非直流偏置正交频分(Non-DC-Biased Orthogonal Frequency Division Multiplexing, NDC-OFDM)复用系统, 该系统采用多个颜色LEDs作为光源, 在保证高传输可靠性的同时可以维持环境光的稳定。将空间调制和同色异谱调制结合并应用到室内可见光OFDM通信系统中得到一种新的适用于室内可见光通信系统的NDC-OFDM传输方案, 该方案具有OFDM、空间调制和同色异谱调制的优势, 适用于高速室内白光通信系统。仿真结果表明所提出的NDC-OFDM室内可见光传输系统与传统的直流偏置光OFDM(DC-biased Optical OFDM)和非对称限幅光OFDM(Asymmetrically Clipped Optical OFDM)相比具有更好的优势, 并且与其它NDC-OFDM室内可见光传输方案相比, 对于OFDM信号高峰均功率比引起的光信号非线性畸变问题, 本文提出的多色LEDs NDC-OFDM室内可见光传输方案除了具有更好的鲁棒性外, 还不会产生光强度波动。

In this paper, a novel orthogonal frequency division multiplexing(OFDM)-based indoor visible light communication(VLC) system was proposed that can provide a high reliability transmission performance while maintaining ambient light stability by using multicolor LEDs. This solution combines Spatial Modulation(SM) and Metameric Modulation(MM) with OFDM-VLC communication system. Along with all of the promising advantages of OFDM, SM and MM, the proposed system will be applicable for high-speed indoor white communication. Through the simulation results, it is known that the proposed indoor visible light transmission system has significant advantages over DC-biased Optical OFDM (DCO-OFDM) and Asymmetrically Clipped Optical OFDM(ACO-OFDM). Moreover, it is robust to the nonlinear distortion caused by a large peak-to-average power ratio(PAPR) of OFDM signal in comparision with other NDC-OFDM VLC transmission systems, and hardly generate intensity fluctuation.