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Proceedings Paper

Energy efficient lighting and communications
Author(s): Z. Zhou; M. Kavehrad; P. Deng
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Paper Abstract

As Light-Emitting Diode (LED)'s increasingly displace incandescent lighting over the next few years, general applications of Visible Light Communication (VLC) technology are expected to include wireless internet access, vehicle-to-vehicle communications, broadcast from LED signage, and machine-to-machine communications. An objective in this paper is to reveal the influence of system parameters on the power distribution and communication quality, in a general plural sources VLC system. It is demonstrated that sources' Half-Power Angles (HPA), receivers' Field-Of Views (FOV), sources layout and the power distribution among sources are significant impact factors. Based on our findings, we developed a method to adaptively change working status of each LED respectively according to users' locations. The program minimizes total power emitted while simultaneously ensuring sufficient light intensity and communication quality for each user. The paper also compares Orthogonal Frequency-Division Multiplexing (OFDM) and On-Off Keying (OOK) signals performance in indoor optical wireless communications. The simulation is carried out for different locations where different impulse response distortions are experienced. OFDM seems a better choice than prevalent OOK for indoor VLC due to its high resistance to multi-path effect and delay spread. However, the peak-to-average power limitations of the method must be investigated for lighting LEDs.

Paper Details

Date Published: 24 January 2012
PDF: 15 pages
Proc. SPIE 8282, Broadband Access Communication Technologies VI, 82820J (24 January 2012); doi: 10.1117/12.906199
Show Author Affiliations
Z. Zhou, The Pennsylvania State Univ. (United States)
M. Kavehrad, The Pennsylvania State Univ. (United States)
P. Deng, Wuhan National Lab. for Optoelectronics (China)

Published in SPIE Proceedings Vol. 8282:
Broadband Access Communication Technologies VI
Benjamin Dingel; Raj Jain; Katsutoshi Tsukamoto, Editor(s)

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