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1. (WO2017185665) DIMMING CONTROL-ORIENTED VISIBLE LIGHT COMMUNICATION METHOD AND DEVICE

Pub. No.:    WO/2017/185665    International Application No.:    PCT/CN2016/102207
Publication Date: Fri Nov 03 00:59:59 CET 2017 International Filing Date: Sat Oct 15 01:59:59 CEST 2016
IPC: H04B 10/116
H04B 10/516
Applicants: TSINGHUA UNIVERSITY
清华大学
Inventors: YANG, Fang
杨昉
GAO, Junnan
高俊男
SONG, Jian
宋健
Title: DIMMING CONTROL-ORIENTED VISIBLE LIGHT COMMUNICATION METHOD AND DEVICE
Abstract:
Disclosed in the present invention are a dimming control-oriented visible light communication method and device. The method comprises the following steps: performing modulation on bits to be transmitted to obtain a signal frame having positive polarity and a signal frame having negative polarity; determining, according to desired light modulation depth, proportions of the signal frame having positive polarity and the signal frame having negative polarity, and a signal frame amplification factor; multiplying the signal frame having positive polarity and the signal frame having negative polarity by the signal frame amplification factor, and performing, according to the proportions, mixing and multiplexing to obtain a mixed signal frame; and adding a direct current offset to the signal frame having negative polarity in the mixed signal frame to obtain a signal frame to be sent, controlling, after digital-analog conversion, frequency conversion, and filtering are performed on the signal frame to be sent, a visible light drive current, and acquiring and sending a visible light communication signal. The method enables visible light communication while ensuring dimming control of lighting, such that refined dimming control having a large control range is achieved without influencing conditions of visible light communication. In addition, the present invention has advantages of superior communication quality, high energy efficiency, etc.