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Journal Article Novel Architecture for Efficient Implementation of Dimmable VPPM in VLC Lightings
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Authors
Jin-Doo Jeong, Sang-Kyu Lim, Il-Soon Jang, Myung-Soon Kim, Tae-Gyu Kang, Jong-wha Chong
Issue Date
2014-12
Citation
ETRI Journal, v.36, no.6, pp.905-912
ISSN
1225-6463
Publisher
한국전자통신연구원 (ETRI)
Language
English
Type
Journal Article
DOI
https://dx.doi.org/10.4218/etrij.14.0114.0396
Project Code
14PC2100, A development of LED system lighting engine module with compact sized data communication modules and driver IC/Processor control parts based on multi-, Kang Tae-Gyu
Abstract
In this paper, a new architecture is proposed to achieve complexity efficiency in implementing variable pulse position modulation (VPPM). VPPM, specified in IEEE 802.15.7, can support wireless communication and dimming control simultaneously using visible light. The proposed architecture is based on the VPPM signal property in which the transition point of the modulated output is obtained by counting the sample index and comparing it to both the assigned dimming factor and the transmitting data. Therefore, the proposed architecture can be composed of simple logics, including a counter, a comparator, and an inverter, all of which are insensitive to the dimming resolution in contrast to a conventional codeword-table method. This paper describes the verification of the proposed algorithm through a register-transfer level implementation of the codeword and proposed architectures. In comparison with the codeword-table method, the proposed method gains a nine-fold complexity reduction at a 1% dimming-step resolution.
KSP Keywords
Dimming Control, IEEE 802.15.7, Register Transfer Level(RTL), Table method, Transition Point, Variable pulse position modulation(VPPM), Visible Light, an inverter, complexity reduction, efficient implementation, wireless communication