Abstract
A visible light communication system with simultaneous brightness control and data transmission is experimentally demonstrated in this paper. A pulse-width modulation (PWM) scheme is adopted for brightness control of the light-emitting diode and pulse-position modulation (PPM) superimposed on top of PWM is used for data communications. We show that independent control of light dimming is possible while transmitting data within a typical room environment, provided the PWM dimming period is an integer multiple of the PPM slot duration. To validate this, we show the measured eye diagrams for a range of dimming levels. In addition, we qualitatively illustrate examples of different dimming levels by changing the dimming level while maintaining the PPM data stream.
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This study was supported in part by the research funds from Chosun University, 2012.
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Choi, Jh., Cho, Eb., Ghassemlooy, Z. et al. Visible light communications employing PPM and PWM formats for simultaneous data transmission and dimming. Opt Quant Electron 47, 561–574 (2015). https://doi.org/10.1007/s11082-014-9932-0
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DOI: https://doi.org/10.1007/s11082-014-9932-0