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Proceedings Paper

Experimental investigation of analog and digital dimming techniques on photometric performance of an indoor Visible Light Communication (VLC) system
Author(s): Fahad Zafar; Vineetha Kalavally; Masuduzzaman Bakaul; R. Parthiban
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Paper Abstract

For making commercial implementation of light emitting diode (LED) based visible light communication (VLC) systems feasible, it is necessary to incorporate it with dimming schemes which will provide energy savings, moods and increase the aesthetic value of the places using this technology. There are two general methods which are used to dim LEDs commonly categorized as analog and digital dimming. Incorporating fast data transmission with these techniques is a key challenge in VLC. In this paper, digital and analog dimming for a 10 Mb/s non return to zero on-off keying (NRZ-OOK) based VLC system is experimentally investigated considering both photometric and communicative parameters. A spectrophotometer was used for photometric analysis and a line of sight (LOS) configuration in the presence of ambient light was used for analyzing communication parameters. Based on the experimental results, it was determined that digital dimming scheme is preferable for use in indoor VLC systems requiring high dimming precision and data transmission at lower brightness levels. On the other hand, analog dimming scheme is a cost effective solution for high speed systems where dimming precision is insignificant.

Paper Details

Date Published: 8 September 2015
PDF: 8 pages
Proc. SPIE 9571, Fourteenth International Conference on Solid State Lighting and LED-based Illumination Systems, 95710D (8 September 2015); doi: 10.1117/12.2187367
Show Author Affiliations
Fahad Zafar, Monash Univ. (Malaysia)
Vineetha Kalavally, Monash Univ. (Malaysia)
Masuduzzaman Bakaul, Monash Univ. (Malaysia)
R. Parthiban, Monash Univ. (Malaysia)

Published in SPIE Proceedings Vol. 9571:
Fourteenth International Conference on Solid State Lighting and LED-based Illumination Systems
Matthew H. Kane; Jianzhong Jiao; Nikolaus Dietz; Jian-Jang Huang, Editor(s)

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