Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Illumination Control of LEDs in Visible Light Communication Using Manchester Code Transmission

  • Lee, Seong-Ho (Department of Electronics & IT Media Engineering, Seoul National University of Science and Technology)
  • Received : 2016.07.14
  • Accepted : 2016.07.14
  • Published : 2016.09.30
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Abstract

In this paper, we introduce a new method for controlling the illumination of LEDs in visible light communication (VLC) by changing the duty cycle of Manchester code. When VLC data were transmitted in Manchester code, the average optical power of the LEDs was proportional to the duty cycle. In experiments, we controlled the illumination of a $3{\times}3$ LED array from 10% to 90% of its peak value by changing the duty cycle of the Manchester code. The synchronizing clocks required for encoding and decoding the Manchester code were supplied by pulse generators that were connected to a 220 V power line. All pulse generators made the same pulses with a repetition frequency of 120 Hz, and they were synchronized with the full-wave rectified voltage of the power line. This scheme is a very simple and useful method for constructing indoor wireless sensor networks using LED light.

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References

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