Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Flicker Prevention and Noise Reduction Using Edge-Spike Modulation in Visible Light Communication

  • Lee, Seong-Ho (Department of Electronics and IT Media Engineering, Seoul National University of Science and Technology)
  • Received : 2018.04.23
  • Accepted : 2018.05.25
  • Published : 2018.05.31
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Abstract

In this paper, we introduce an edge-spike modulation method for visible light communication (VLC). This method is effective in preventing LED flicker and 120 Hz noise interference in base-band VLC. In the VLC transmitter, edge-spikes are generated by passing the digital data through a simple RC-high pass filter (HPF). The LED modulation of the edge-spikes does not change the average power of the LED light; thus it prevents LED flicker. In the VLC receiver, the 120 Hz noise from other lighting lamps is easily eliminated by RC-HPF, while the edge-spike signal is detected normally. In our experiment, the message of an air-quality sensor was successfully transmitted using edge-spike modulation. This structure is useful in constructing, e.g., wireless gas monitoring sensor systems to warn and prevent harmful gas leakage accidents in buildings using LED light.

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References

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