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Increasing Vehicular Visible Light Communications Range Based on LED Current Overdriving and Variable Pulse Position

Cătălin Beguni1,2, Alin-Mihai Căilean1,2,3, Sebastian-Andrei Avătămăniței1,2

  • 1Integrated Center for Research, Development and Innovation in Advanced Materials, Nanotechnologies and Distributed Systems for Fabrication and Control, Stefan cel Mare University of Suceava, 720229 Suceava, Romania.

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Summary

Researchers enhanced vehicle safety by extending Visible Light Communications (VLC) range by 370% using LED current overdriving and modified Variable Pulse Position Modulation (VPPM) at the transmitter. This improves communication distance for critical safety applications.

Keywords:
LED current overdrivingV2VVLC rangeinter-vehicle communicationsoptical communicationsoptical wireless communicationstraffic safetyvehicle to vehicle communicationsvisible light communication

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Area of Science:

  • Electrical Engineering
  • Optical Communications
  • Automotive Technology

Background:

  • Visible Light Communications (VLC) is increasingly integrated into vehicle safety applications due to its unique advantages.
  • A key challenge for vehicular VLC systems is extending their communication range.
  • Existing research often focuses on receiver improvements, leaving transmitter-side enhancements underexplored.

Purpose of the Study:

  • To propose and validate a novel approach for significantly enhancing the communication range of vehicular VLC systems.
  • To focus on improving the VLC transmitter, rather than the receiver, to achieve greater communication distances.
  • To enable vehicular VLC systems to meet the range requirements for advanced vehicle safety applications.

Main Methods:

  • The study introduces a novel concept based on Light-Emitting Diode (LED) current overdriving at the transmitter.
  • A modified Variable Pulse Position Modulation (VPPM) scheme is employed to manage data transmission.
  • The approach ensures compliance with eye safety regulations and protects LEDs from overheating.

Main Results:

  • Experimental testing confirmed the viability of the proposed concept under laboratory conditions.
  • The communication range was increased by up to 370% compared to conventional methods.
  • The enhancement was achieved while maintaining the same overall optical irradiance at the VLC transmitter.

Conclusions:

  • The novel transmitter-based approach effectively extends the communication range of vehicular VLC systems.
  • This significant range increase has the potential to fulfill the demands of communication-based vehicle safety applications.
  • The exploitation of LED current overdriving and modified VPPM for vehicular VLC range extension is a novel contribution.