Novel Architecture for Efficient Implementation of Dimmable VPPM in VLC Lightings
- Title
- Novel Architecture for Efficient Implementation of Dimmable VPPM in VLC Lightings
- Author
- 정정화
- Keywords
- Dimming; VLC; VPPM; LED; RTL
- Issue Date
- 2014-12
- Publisher
- ELECTRONICS TELECOMMUNICATIONS RESEARCH INST, 161 KAJONG-DONG, YUSONG-GU, TAEJON 305-350, SOUTH KOREA
- Citation
- ETRI journal v.36 no.6 ,pp. 905 - 912 , 2014 , 1225-6463 ,
- 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.
- URI
- http://dx.doi.org/10.4218/etrij.14.0114.0396http://hdl.handle.net/20.500.11754/51994
- ISSN
- 1225-6463
- DOI
- 10.4218/etrij.14.0114.0396
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > ELECTRONIC ENGINEERING(융합전자공학부) > Articles
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