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Article

A 40 Mb/s VLC System Reusing an Existing Large LED Panel in an Indoor Office Environment

1
Optical Communications Research Group, Faculty of Engineering and Environment, Northumbria University, Newcastle upon Tyne NE1 8ST, UK
2
Department of Electromagnetic Field, Faculty of Electrical Engineering, Czech Technical University in Prague, 16627 Prague, Czech Republic
3
Intelligent Sensing and Communications Group, School of Engineering, Newcastle University, Newcastle upon Tyne NE1 7RU, UK
*
Author to whom correspondence should be addressed.
The 12th International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDSP), Porto, Portugal, 20–22 July 2020.
Academic Editor: Antonio Moschitta
Sensors 2021, 21(5), 1697; https://doi.org/10.3390/s21051697
Received: 2 February 2021 / Revised: 17 February 2021 / Accepted: 22 February 2021 / Published: 2 March 2021
(This article belongs to the Special Issue Visible Light Communication, Networking, and Sensing)
With advances in solid-state lighting, visible light communication (VLC) has emerged as a promising technology to enhance existing light-emitting diode (LED)-based lighting infrastructure by adding data communication capabilities to the illumination functionality. The last decade has witnessed the evolution of the VLC concept through global standardisation and product launches. Deploying VLC systems typically requires replacing existing light sources with new luminaires that are equipped with data communication functionality. To save the investment, it is clearly desirable to make the most of the existing illumination systems. This paper investigates the feasibility of adding data communication functionality to the existing lighting infrastructure. We do this by designing an experimental system in an indoor environment based on an off-the-shelf LED panel typically used in office environments, with the dimensions of 60 × 60 cm2. With minor modifications, the VLC function is implemented, and all of the modules of the LED panel are fully reused. A data rate of 40 Mb/s is supported at a distance of up to 2 m while using the multi-band carrierless amplitude and phase (CAP) modulation. Two main limiting factors for achieving higher data rates are observed. The first factor is the limited bandwidth of the LED string inside the panel. The second is the flicker due to the residual ripple of the bias current that is generated by the panel’s driver. Flicker is introduced by the low-cost driver, which provides bias currents that fluctuate in the low frequency range (less than several kilohertz). This significantly reduces the transmitter’s modulation depth. Concurrently, the driver can also introduce an effect that is similar to baseline wander at the receiver if the flicker is not completely filtered out. We also proposed a solution based on digital signal processing (DSP) to mitigate the flicker issue at the receiver side and its effectiveness has been confirmed. View Full-Text
Keywords: visible light communication; LED; carrierless amplitude and phase modulation (CAP); LED driver; bias-tee; lighting infrastructure visible light communication; LED; carrierless amplitude and phase modulation (CAP); LED driver; bias-tee; lighting infrastructure
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MDPI and ACS Style

Li, X.; Ghassemlooy, Z.; Zvánovec, S.; Haigh, P.A. A 40 Mb/s VLC System Reusing an Existing Large LED Panel in an Indoor Office Environment. Sensors 2021, 21, 1697. https://doi.org/10.3390/s21051697

AMA Style

Li X, Ghassemlooy Z, Zvánovec S, Haigh PA. A 40 Mb/s VLC System Reusing an Existing Large LED Panel in an Indoor Office Environment. Sensors. 2021; 21(5):1697. https://doi.org/10.3390/s21051697

Chicago/Turabian Style

Li, Xicong, Zabih Ghassemlooy, Stanislav Zvánovec, and Paul A. Haigh 2021. "A 40 Mb/s VLC System Reusing an Existing Large LED Panel in an Indoor Office Environment" Sensors 21, no. 5: 1697. https://doi.org/10.3390/s21051697

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