Reducing the Effects of Noise Light Using Inter-Bit Noise Detection in a Visible Light Identification System

가시광 무선인식장치에서 비트간 잡음검출에 의한 잡음광의 영향 감소

  • Hwang, Da-Hyun (Graduate School of NID Fusion Technology, Seoul National University of Science and Technology) ;
  • Lee, Seong-Ho (Department of Electronic & Information Engineering, Seoul National University of Science and Technology)
  • 황다현 (서울과학기술대학교 NID 융합기술대학원) ;
  • 이성호 (서울과학기술대학교 전자정보공학과)
  • Received : 2011.09.14
  • Accepted : 2011.11.03
  • Published : 2011.11.30


In this paper, we used the inter-bit noise detection method in order to reduce the effects of noise light in a visible light identification system that uses a visible LED as a carrier source. A visible light identification system consists of a reader and a transponder. When the enable signal from the reader is detected, the transponder encodes the response data in RZ(Return-to-Zero) bit stream and sends response signal by modulating a visible LED. The reader detects the response signal mixed with noise light, samples the noise voltage in each blank low time between data bits of the RZ signal, and recovers the original data by subtracting the sampled noise from the received signal. In experiments, we improved the signal-to-noise ratio by 20dB using the inter-bit noise detection method.


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