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Efficient visible light communication drivers using illumination LEDs in industrial environments

: Schneider, Daniel; Shrotri, Abhijeet; Flatt, Holger; Stübbe, Oliver; Lachmayer, Roland


Cheben, P. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Integrated Optics: Design, Devices, Systems and Applications VI : 19-23 April 2021, Online Only, Czech Republic
Bellingham, WA: SPIE, 2021 (Proceedings of SPIE 11775)
ISBN: 978-1-5106-4384-0
ISBN: 978-1-5106-4385-7
Paper 1177515, 14 pp.
Conference "Integrated Optics - Design, Devices, Systems and Applications" <6, 2021, Online>
Conference Paper
Fraunhofer IOSB ()
Optical Wireless Communication; visible light communication; Li-Fi

Visible light communication (VLC) allows the dual use of lighting and wireless communication systems by modulation of illumination devices. However, to increase the performance, typically, beam-forming measures are taken creating pencil beams, thus contradicting the illumination purpose. In order to optimize the performance trade off between efficient illumination and communication, the switching capabilities of illumination LEDs are examined. Illumination LEDs with standard drivers and without beam-forming show limited applicability for communication purposes as they are not optimized for the necessary switching capability (f ≈11 MHz) and coherence. Methods to enhance the electrical current by pre-equalisation, biasing, carrier sweeping and current shaping are examined in respect to the illumination LED's communication performance. A novel driver scheme is derived which achieves considerably higher switching frequencies (f ≥100 MHz) without employing beamforming at the illumination LED. This driver is able to obtain a data rate of up to 200 Mbit/s at a distance of 3.2 m, using on-off keying (OOK) modulation technique. Therefore, it is feasible to apply the LED driver by implementing standardised illumination devices in VLC systems.