Abstract
As an emerging wireless communications technology, visible light communications (VLC) have attracted much attention for synergistically providing both high-speed data transmission and high-quality illumination. To provide energy savings and ecological benefits, dimming control is an essential function in VLC systems where users can obtain the required illumination levels. However, the conventional binary-based dimming schemes are spectrally inefficient. In this paper, we propose a novel multilevel data transmission scheme for VLC systems that can achieve dimming control and communication functions simultaneously. Additionally, the encoding/decoding structure is provided where the specific symbol set can maintain the specific dimming level. Finally, simulation results show that the proposed multilevel transmission scheme can achieve increased spectral efficiency and better error performance.
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