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Constraints on drivers for visible light communications emitters based on energy efficiency
Optics Express
|May 4, 2016
Summary
Visible light communication (VLC) drivers using switched and On-Off Keying (OOK) signals are more energy-efficient for LED illumination. Sinusoidal and Orthogonal Frequency Division Multiplexing (OFDM) signals show lower energy efficiency.
Area of Science:
- Optoelectronics
- Optical Communications
- Energy Efficiency
Background:
- Light-Emitting Diodes (LEDs) are increasingly used as primary illumination sources.
- Energy efficiency is a critical constraint for LED drivers in Visible Light Communication (VLC) systems.
Purpose of the Study:
- To analyze energy efficiency constraints for VLC LED emitters.
- To investigate the impact of waveform shape and modulation techniques on LED lamp energy efficiency.
Main Methods:
- Calculated the emitter energy efficiency ratio (η = PLED/PTOTAL) for various signals at similar illumination levels.
- Compared switched and sinusoidal signals.
- Analyzed On-Off Keying (OOK) and Orthogonal Frequency Division Multiplexing (OFDM) modulation effects based on power supply, illumination, and signal distortion.
Main Results:
- Switched and OOK signals demonstrated higher energy efficiency, with η ranging from 0.86 to 0.95.
- Sinusoidal and OFDM signals exhibited lower energy efficiency, with η ranging from 0.53 to 0.79.
Conclusions:
- Switched waveforms and OOK modulation are superior for energy-efficient VLC LED drivers.
- Signal characteristics significantly influence the overall energy efficiency of LED illumination systems.
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