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Journal of Sensors
Volume 2015 (2015), Article ID 963296, 8 pages
http://dx.doi.org/10.1155/2015/963296
Research Article

Modeling and Analysis of DIPPM: A New Modulation Scheme for Visible Light Communications

Department of Electrical Engineering, University of Ulsan, Ulsan 680-749, Republic of Korea

Received 19 March 2015; Revised 16 June 2015; Accepted 25 June 2015

Academic Editor: Geoffrey A. Cranch

Copyright © 2015 Sana Ullah Jan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Visible Light Communication (VLC) uses an Intensity-Modulation and Direct-Detection (IM/DD) scheme to transmit data. However, the light source used in VLC systems is continuously switched on and off quickly, resulting in flickering. In addition, recent illumination systems include dimming support to allow users to dim the light sources to the desired level. Therefore, the modulation scheme for data transmission in VLC system must include flicker mitigation and dimming control capabilities. In this paper, the authors propose a Double Inverse Pulse Position Modulation (DIPPM) scheme that minimizes flickering and supports a high level of dimming for the illumination sources in VLC systems. To form DIPPM, some changes are made in the symbol structure of the IPPM scheme, and a detailed explanation and mathematical model of DIPPM are given in this paper. Furthermore, both analytical and simulation results for the error performance of 2-DIPPM are compared with the performance of VPPM. Also, the communication performance of DIPPM is analyzed in terms of the normalized required power.