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Optical Engineering

Illumination distribution and signal transmission for indoor visible light communication with different light-emitting diode arrays and pre-equality circuits
Author(s): Hsi-Chao Chen; Cheng-Jyun Liou; Syuan-Ruei Siao
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Paper Abstract

The purpose of this study was to seek the optimal design for light-emitting diode (LED) arrays and pre-equality circuits in indoor visible lighting illumination combined with communication. The optical and communicational properties of illumination distribution and signal transmission were investigated. These illumination distributions of array sources were derivate and simulated and actually can be used in free-space communication. Simulated results show the total flux size was rectangle<radial<circlearray, and real measurements also showed the total flux was rectangle<radial<circlearray. The simulated and measured results have a similarity of over 98% by normalized cross correlation. In addition, when the distance of the installed lamp from the wall was 1 m, the rectangular array had the best illumination uniformity of 77.24%, and the size of uniformity was the rectangle<radialcircle array. Finally, the gain and constant-current pre-equality circuits were used in free-space communication with a carrier frequency from 1 KHz to 1 MHz at a distance of 1.8 m. Both the received signal intensity and divergence angle were rectangle<radial<circle array. The constant-current pre-equality circuit could add the divergence angle from ±18.6  deg to ±36.68  deg in the rectangle array at a carrier frequency of 1 MHz.

Paper Details

Date Published: 12 November 2015
PDF: 10 pages
Opt. Eng. 54(11) 115106 doi: 10.1117/1.OE.54.11.115106
Published in: Optical Engineering Volume 54, Issue 11
Show Author Affiliations
Hsi-Chao Chen, National Yunlin Univ. of Science and Technology (Taiwan)
Cheng-Jyun Liou, National Yunlin Univ. of Science and Technology (Taiwan)
Syuan-Ruei Siao, National Yunlin Univ. of Science and Technology (Taiwan)

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