Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Dimming Control in Visible Light Communication Using Subcarrier Modulation of Manchester Code

맨체스터 코드의 부반송파 변조를 이용한 가시광통신의 조명제어

  • Lee, Seong-Ho (Department of Electronics and IT Media Engineering, Seoul National University of Science and Technology)
  • 이성호 (서울과학기술대학교 전자IT미디어공학과)
  • Received : 2019.04.22
  • Accepted : 2019.05.29
  • Published : 2019.05.31
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Abstract

In this study, we propose a dimming control method for a visible light communication (VLC) system, in which the subcarrier on-off keying (OOK) modulation of Manchester code is used for data transmission. In the VLC transmitter, non-return-to-zero (NRZ) code data is transformed to Manchester code, which is OOK modulated with a subcarrier. Manchester code is used for flicker-free lighting; the duty factor is changed for dimming control, and the subcarrier is used for preventing the adjacent noise light interference. In the experiments, the dimming control was carried out from about 8%-92% of the continuous wave (CW) LED light. This configuration is simple and effective in constructing a VLC system for indoor wireless sensor networks with flicker-free illumination and dimming control capability without adjacent noise light interference.

Keywords

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Fig. 1.Waveforms in OOK Manchester code transmission. (a) Sync pulse, (b) NRZ input data, (c) Base-band Manchester code, (d) OOK Manchester code with low DC level, and (e) OOK Manchester code with high DC level.

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Fig. 3. Configuration of the VLC transmitter.

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Fig. 4. Observed waveforms in the VLC transmitter. (a) Sync pulse waveform, (b) NRZ input data waveform, (c) Base-band Manchester code, and (d) OOK Manchester code.

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Fig. 5. Observed waveforms in the VLC transmitter. (a) Sync pulse waveform, (b) NRZ data waveform, (c), (d), (e) OOK Manchester codes with low DC level and duty factors of 10%, 50%, 90%, respectively.

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Fig. 6. Observed waveforms in the VLC transmitter. (a) Sync pulse waveform, (b) NRZ data waveform, (c), (d), (e) OOK Manchester code with high DC level and duty factor of 10%, 50%, 90%, respectively.

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Fig. 7. Configuration of the VLC receiver.

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Fig. 8. Observed waveforms in the VLC receiver. (a) Photodiode voltage waveform, (b) OOK modulated sync pulse waveform, and (c) OOK modulated Manchester code waveform.

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Fig. 9. Observed waveforms in the VLC receiver. (a) OOK modulated sync pulse waveform, (b), (c), (d) OOK modulated Manchester code with the duty factors of 10%, 50%, 90%, respectively.

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Fig. 10. Observed waveforms in the VLC receiver. (a) OOK modulated sync pulse waveform, (b) Recovered base-band sync pulse, (c) OOK modulated Manchester code waveform, (d) Recovered base-band Manchester code, and (e) Recovered NRZ code data.

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Fig. 11. Circuit boards used in experiments.

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Fig. 2. Average LED optical power versus duty factor.

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