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Proceedings Paper

QPSK modulation for AC-power-signal-biased visible light communication system
Author(s): Yu-Feng Liu; Chien-Hung Yeh; Chi-Wai Chow; Yang Liu
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Paper 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.

Paper Details

Date Published: 4 February 2013
PDF: 7 pages
Proc. SPIE 8645, Broadband Access Communication Technologies VII, 86450L (4 February 2013); doi: 10.1117/12.2002030
Show Author Affiliations
Yu-Feng Liu, National Chiao Tung Univ. (Taiwan)
Chien-Hung Yeh, Industrial Technology Research Institute (Taiwan)
Fu Jen Catholic Univ. (Taiwan)
Chi-Wai Chow, National Chiao Tung Univ. (Taiwan)
Yang Liu, Hong Kong Productivity Council (Hong Kong, China)

Published in SPIE Proceedings Vol. 8645:
Broadband Access Communication Technologies VII
Benjamin B. Dingel; Raj Jain; Katsutoshi Tsukamoto, Editor(s)

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