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Noise-Resistant Visible Light Communications Using Subpulse-VPPM

Subpulse-VPPM 변조를 이용한 잡음에 강한 가시광통신

  • Kim, Jonghun (Kookmin University Electronics Engineering Department) ;
  • Lee, Seungwoo (Kookmin University Electronics Engineering Department) ;
  • Ju, MinChul (Kookmin University Electronics Engineering Department) ;
  • Park, Youngil (Kookmin University Electronics Engineering Department)
  • Received : 2014.11.01
  • Accepted : 2015.01.09
  • Published : 2015.02.28

Abstract

If visible light communication is to be used against large background noise in indoor environment, low frequency noise should be avoided. To maintain the advantages of LED lighting while transmitting signals, LEDs should be dimmable and free from flickering effect. In this paper, the spectrum of transmission signal is shifted toward high frequency for this purpose. Specifically, we propose a subpulse-VPPM scheme, which can be designed using only digital components, and we implement a test-bed for performance measurement.

배경 잡음이 강한 실내 환경에서 가시광통신을 이용하기 위해서는 저주파대역 잡음을 피해야 한다. 또한 통신을 하면서도 LED 조명의 장점을 유지하기 위해서는 조명등의 깜박임이 없어야 하며, 밝기를 조절할 수 있어야 한다. 본 논문에서는 위 기능을 수행하기 위해 신호 스펙트럼을 고주파 영역으로 이동하여 전송을 수행하였다. 특히 송수신을 모두 디지털회로만으로 구현 가능하도록 Subpulse-VPPM 변조방법을 제안하고, 전송 성능 측정을 위해 테스트베드를 제작하였다.

Keywords

References

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