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학술지 Novel Architecture for Efficient Implementation of Dimmable VPPM in VLC Lightings
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저자
정진두, 임상규, 장일순, 김명순, 강태규, 정정화
발행일
201412
출처
ETRI Journal, v.36 no.6, pp.905-912
ISSN
1225-6463
출판사
한국전자통신연구원 (ETRI)
DOI
https://dx.doi.org/10.4218/etrij.14.0114.0396
협약과제
14PC2100, 멜티센서 기반의 데이터 통신모듈과 드라이버 IC/프로세서 제어부품을 탑재한 200cc이하의 LED 시스템조명 엔진모듈 기술개발, 강태규
초록
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.
키워드
Dimming, LED, RTL, VLC, VPPM
KSP 제안 키워드
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