Visible light communications employing PPM and PWM formats for simultaneous data transmission and dimming

Choi, Joon-Ho, Cho, Eun-byeol, Ghassemlooy, Zabih, Kim, Soeun and Lee, Chung Ghiu (2015) Visible light communications employing PPM and PWM formats for simultaneous data transmission and dimming. Optical and Quantum Electronics, 47 (3). pp. 561-574. ISSN 0306-8919

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Abstract

A visible light communication system with simultaneous brightness control and data transmission is experimentally demonstrated in this paper. A pulse-width modulation (PWM) scheme is adopted for brightness control of the light-emitting diode and pulse-position modulation (PPM) superimposed on top of PWM is used for data communications. We show that independent control of light dimming is possible while transmitting data within a typical room environment, provided the PWM dimming period is an integer multiple of the PPM slot duration. To validate this, we show the measured eye diagrams for a range of dimming levels. In addition, we qualitatively illustrate examples of different dimming levels by changing the dimming level while maintaining the PPM data stream.

Item Type:	Article
Additional Information:	Published online ahead of print publication.
Uncontrolled Keywords:	optical communications, optical wireless communications, visible light communications, illumination, light-emitting diodes, dimming control, PPM, PWM
Subjects:	H600 Electronic and Electrical Engineering
Department:	Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User:	Paul Burns
Date Deposited:	23 Sep 2014 08:38
Last Modified:	12 Oct 2019 19:20
URI:	http://nrl.northumbria.ac.uk/id/eprint/17645

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