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Article

Multi-User Precoder Designs for RGB Visible Light Communication Systems

1
The Department of Signal Theory and Comunications, Universitat Politècnica de Catalunya (UPC); 08034 Barcelona, Spain
2
Signal Processing Laboratory (LTS5), École Polytechnique Fédérale de Lausanne (EPFL); 1015 Lausanne, Switzerland
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(23), 6836; https://doi.org/10.3390/s20236836
Received: 22 October 2020 / Revised: 19 November 2020 / Accepted: 25 November 2020 / Published: 29 November 2020
(This article belongs to the Collection Visible Light Communication (VLC))
In this paper, we design linear precoders for the downlink of a visible light communication (VLC) system that simultaneously serves multiple users. Instead of using phosphor-coated white light-emitting diodes (PWLEDs), we focus on Red-Green-Blue light-emitting diodes (RGB-LEDs) that allow modulating three separate data streams on the three primary colors of the RGB-LEDs. For this system, we design a zero-forcing (ZF) precoder that maximizes the weighted sum rate for a multilevel pulse amplitude modulation (M-PAM). The precoding design in RGB-based systems presents some challenges due to the system constraints, such as the limited power, the non-negative amplitude constraints per light-emitting diode (LED), and the need to guarantee white light emission while transmitting with RGB-LEDs. For comparison purposes, we also consider the ZF design for a PWLED-based system and evaluate the performance of both a PWLED- and an RGB-based system. View Full-Text
Keywords: visible light communications; multi-user; linear precoding; adaptive modulation; zero forcing; weighted sum-rate maximization; Red-Green-Blue; RGB-LEDs visible light communications; multi-user; linear precoding; adaptive modulation; zero forcing; weighted sum-rate maximization; Red-Green-Blue; RGB-LEDs
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MDPI and ACS Style

Viñals, R.; Muñoz, O.; Agustín, A.; Vidal, J. Multi-User Precoder Designs for RGB Visible Light Communication Systems. Sensors 2020, 20, 6836. https://doi.org/10.3390/s20236836

AMA Style

Viñals R, Muñoz O, Agustín A, Vidal J. Multi-User Precoder Designs for RGB Visible Light Communication Systems. Sensors. 2020; 20(23):6836. https://doi.org/10.3390/s20236836

Chicago/Turabian Style

Viñals, Roser, Olga Muñoz, Adrián Agustín, and Josep Vidal. 2020. "Multi-User Precoder Designs for RGB Visible Light Communication Systems" Sensors 20, no. 23: 6836. https://doi.org/10.3390/s20236836

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