The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Prototype Implementation of VLC Upstream Transmission Using Focused IR-LED

집광된 IR-LED를 이용한 가시광 통신 상향 전송 프로토타입 구현

  • 장윤선 (국민대학교 전자공학과 광대역통신 연구실) ;
  • 최경묵 (국민대학교) ;
  • 주민철 (국민대학교) ;
  • 박영일 (국민대학교 전자공학과 광대역통신 연구실)
  • Received : 2012.07.16
  • Accepted : 2012.09.03
  • Published : 2012.09.30
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Abstract

In this paper, we propose a upstream transmission method to extend coverage in visible light communication (VLC) systems. We extend transmission distance by using focused infrared(IR) light emitting diodes(LEDs). Since the focused light covers just limited area, it might have a difficulty in transmitting data if the transmitter and receiver are not properly aligned. To solve this problem, we arrange multiple IR-LEDs in different direction and select a single best performing IR-LED among multiple IR-LEDs. Also, the transmission performance is periodically checked and another IR-LED is reselected to support the required quality of service (QoS) and to minimize battery consumption required by a mobile terminal.

본 논문에서는 가시광 통신(visible light communication: VLC) 상향 전송에서 전송거리 확대를 위한 전송방식을 제안하였다. 이를 위해 집광된 infrared(IR)-light emitting diode(LED)의 출력을 이용하여 조명에 위치한 광수신부에 전송하였다. 이러한 집광을 하는 경우 지향성이 너무 커서 IR-LED를 조명부 수신모듈에 정확히 향하지 않는다면 전송이 어렵게 되는 문제점이 있는데, 이를 해결하기 위해 여러 개의 IR-LED를 조금씩 다른 방향을 향하도록 배치하고, 수신부와 통신을 통해 이 중 최고의 전송성능을 보이는 IR-LED를 선택하는 방법을 제안하였다. 통신 성능을 주기적으로 감시하고, 성능이 저하되면 LED 재검색 과정을 통해 새롭게 최상의 성능을 보이는 LED로 통신을 교체하도록 한다.

Keywords

References

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