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Utilization of Optical OFDM Modulation on Blue LED VLC Datacom Without Equalization for 4 m Wireless Link.

Yuan-Zeng Lin1, Chien-Hung Yeh2,3, Wen-Piao Lin4

  • 1Department of Photonics, National Yang Ming Chiao Tung University, Hsinchu 300093, Taiwan.

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|November 27, 2024
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Summary
This summary is machine-generated.

This study demonstrates achieving over 1 Gbit/s visible light communication (VLC) traffic capacity using a single blue light-emitting diode (LED) and an orthogonal frequency division multiplexing quadrature amplitude modulation (OFDM-QAM) system. This breakthrough enables high-speed indoor wireless networks even in low-light conditions.

Keywords:
APDOFDM-QAMblue LEDequalizationvisible light communication (VLC)

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Area of Science:

  • Optoelectronics
  • Wireless Communication
  • Optical Engineering

Background:

  • Visible light communication (VLC) systems commonly use wide bandwidth light-emitting diodes (LEDs) and spectral efficiency modulation for high traffic capacity.
  • Achieving high data rates in VLC systems is crucial for next-generation indoor wireless networks.

Purpose of the Study:

  • To demonstrate a visible light communication (VLC) system capable of achieving over 1 Gbit/s capacity using a single blue LED.
  • To evaluate the performance of an orthogonal frequency division multiplexing quadrature amplitude modulation (OFDM-QAM) system with bit- and power-loading algorithms under low illumination conditions.

Main Methods:

  • Application of orthogonal frequency division multiplexing quadrature amplitude modulation (OFDM-QAM) with bit- and power-loading algorithms on a single blue LED.
  • Utilizing a 400 MHz bandwidth avalanche photodiode (APD)-based receiver (Rx) for decoding the optical signal.
  • Testing the system's performance over wireless link lengths of 1 to 4 meters with illumination levels ranging from 255 to 40 lux.

Main Results:

  • Achieved a data rate exceeding 1 Gbit/s (0.962 to 1.057 Gbit/s) using a single blue LED and OFDM-QAM.
  • Demonstrated successful decoding with a 400 MHz bandwidth APD receiver under poorly illuminated indoor conditions.
  • Confirmed the effectiveness of the high-sensitivity APD in compensating for wireless VLC link length.

Conclusions:

  • A single blue LED VLC system can achieve high data rates (>1 Gbit/s) suitable for indoor access networks.
  • The proposed OFDM-QAM system with APD receiver is effective even in low-light environments without analog equalization.
  • This technology offers a viable solution for enhancing indoor wireless communication capacity.