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A 40 Mb/s VLC System Reusing an Existing Large LED Panel in an Indoor Office Environment
Xicong Li1, Zabih Ghassemlooy1, Stanislav Zvánovec2
1Optical Communications Research Group, Faculty of Engineering and Environment, Northumbria University, Newcastle upon Tyne NE1 8ST, UK.
Sensors (Basel, Switzerland)
|April 3, 2021
Summary
This study demonstrates adding data communication to existing office LED panels, achieving 40 Mb/s using visible light communication (VLC). A digital signal processing solution effectively mitigates flicker, a key limitation for higher data rates.
Area of Science:
- Electrical Engineering
- Optical Communications
- Solid-State Lighting
Background:
- Visible Light Communication (VLC) leverages LED lighting for data transmission.
- Current VLC deployment often necessitates replacing existing luminaires.
- Utilizing existing infrastructure minimizes investment and promotes sustainability.
Purpose of the Study:
- To investigate the feasibility of integrating VLC into standard office LED panels.
- To reuse existing lighting hardware for data communication capabilities.
- To identify and address limitations hindering higher data rates in such systems.
Main Methods:
- Designed an experimental VLC system using a 60x60 cm off-the-shelf LED panel.
- Implemented VLC with minor modifications, reusing all original LED panel modules.
- Employed multi-band carrierless amplitude and phase (CAP) modulation.
Main Results:
- Achieved a data rate of 40 Mb/s at a distance of 2 m.
- Identified LED string bandwidth and driver-induced flicker as primary limitations.
- Confirmed the effectiveness of a digital signal processing (DSP) solution for flicker mitigation.
Conclusions:
- VLC functionality can be successfully added to existing office LED panels with minimal modifications.
- Flicker from low-cost drivers significantly impacts data rates and requires mitigation.
- DSP offers a viable solution to overcome flicker-related challenges in VLC systems.
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