QPSK modulation for AC-power-signal-biased visible light communication system

Yu-Feng Liu; Chien-Hung Yeh; Chi-Wai Chow; Yang Liu

doi:10.1117/12.2002030

4 February 2013 QPSK modulation for AC-power-signal-biased visible light communication system

Yu-Feng Liu, Chien-Hung Yeh, Chi-Wai Chow, Yang Liu

Proceedings Volume 8645, Broadband Access Communication Technologies VII; 86450L (2013) https://doi.org/10.1117/12.2002030
Event: SPIE OPTO, 2013, San Francisco, California, United States

Abstract

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.

Citation Download Citation

Yu-Feng Liu, Chien-Hung Yeh, Chi-Wai Chow, and 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); https://doi.org/10.1117/12.2002030

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