Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Reducing the Effects of Noise Light in a Visible Light Communication System Using Two Color LEDs

가시광통신 시스템에서 2색 LED를 이용한 잡음광의 영향 감소

  • Lee, Seong-Ho (Department of Electronic & IT Media Engineering, Seoul National University of Science and Technology)
  • 이성호 (서울과학기술대학교 전자IT미디어공학과)
  • Received : 2012.09.17
  • Accepted : 2012.11.01
  • Published : 2012.11.30
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Abstract

In this paper, we reduced the optical noise interference in a visible light communication system using two color LEDs. In the transmitter, the original and the inverted signals of the transmitted data modulated a red LED and a blue LED, respectively. In the receiver, a differential detector which is composed of two photodetectors and an optical red filter detected the mixed signal radiated from the two LEDs. In an environment that the optical noise from a fluorescent lamp exists, the signal-to-noise ratio in this system was improved by about 20dB compared to that in the conventional system which uses a single LED and a single photodetector.

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References

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