가시광통신에서 맨체스터코드 듀티율과 스파이크검출을 이용한 LED 조명제어
LED Dimming Control Using Manchester-Code Duty Factor And Spike Detection in Visible Light Communication
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초록
가시광통신은 조명과 통신을 동시에 수행하므로, 데이터 전송과정에서 광전력의 변동으로 인하여 발생하는 플리커를 방지함과 동시에 조명제어 기능을 갖추는 것이 중요하다. 본 논문에서는 플리커를 방지하고 조명제어를 위하여 맨체스터코드를사용하였다. 송신부에서는 맨체스터코드의 듀티율을 사용하여 LED의 조명을 제어하였고, 수신부에서는 RC-고역통과필터의가장자리 스파이크 신호를 사용하여 인접된 잡음광을 차단하고 맨체스터코드를 복구하였다. 실험에서 LED 빛은 플리커가없는 상태를 유지하였고, 맨체스터코드의 듀티율을 변경함으로써 평균 광전력을 CW LED 광의 약 8～68 % 의 범위에서 제어하였다.
Abstract
Visible light communication (VLC) performs illumination and communication simultaneously, thus it is important toprevent the flicker due to the optical power variation during data transmission and at the same time to have dimmingcontrol capability. In this paper, we used Manchester code for flicker-prevention and dimming control. In thetransmitter, the duty factor of the Manchester code was used for controlling the LED illumination. In the receiver, theedge-spike signals of an RC-high pass filter were used for recovering the Manchester code while preventing theadjacent noise light. In experiments, the LED light was kept flicker-free and the average optical power was controlledin the range of 8～68 % of the continuous wave (CW) LED light by changing the duty factor of the Manchester code.
참고문헌 (7)
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