4 February 2013 QPSK modulation for AC-power-signal-biased visible light communication system
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With the integration of light emitting diode (LED), visible light communication (VLC) can provide wireless communication link using the lightning system. Due to the consideration of power efficiency, AC-LED has the design of reducing energy waste with alternating current from the power outlet. In this work, we propose an AC-power-signalbiased system that provides communication on both DC-LED and AC-LED. The bias circuit is designed to combine ACpower signal and the message signal with QPSK format. This driving scheme needs no AC-to-DC converters and it is suitable for driving AC LED. Synchronization is completed to avoid threshold effect of LED.
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Yu-Feng Liu, Yu-Feng Liu, Chien-Hung Yeh, Chien-Hung Yeh, Chi-Wai Chow, Chi-Wai Chow, Yang Liu, Yang Liu, } "QPSK modulation for AC-power-signal-biased visible light communication system", Proc. SPIE 8645, Broadband Access Communication Technologies VII, 86450L (4 February 2013); doi: 10.1117/12.2002030; https://doi.org/10.1117/12.2002030


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