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http://dx.doi.org/10.5369/JSST.2019.28.3.191

Dimming Control in Visible Light Communication Using Subcarrier Modulation of Manchester Code  

Lee, Seong-Ho (Department of Electronics and IT Media Engineering, Seoul National University of Science and Technology)
Publication Information
Journal of Sensor Science and Technology / v.28, no.3, 2019 , pp. 191-197 More about this Journal
Abstract
In this study, we propose a dimming control method for a visible light communication (VLC) system, in which the subcarrier on-off keying (OOK) modulation of Manchester code is used for data transmission. In the VLC transmitter, non-return-to-zero (NRZ) code data is transformed to Manchester code, which is OOK modulated with a subcarrier. Manchester code is used for flicker-free lighting; the duty factor is changed for dimming control, and the subcarrier is used for preventing the adjacent noise light interference. In the experiments, the dimming control was carried out from about 8%-92% of the continuous wave (CW) LED light. This configuration is simple and effective in constructing a VLC system for indoor wireless sensor networks with flicker-free illumination and dimming control capability without adjacent noise light interference.
Keywords
Visible light communication (VLC); LED; on-off keying (OOK); Manchester code; flicker-free; dimming control;
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