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Entropy loading for capacity maximization of RGB-based visible light communications

Loureiro, Pedro A. Loureiro ; Silva, V. ; Medeiros, M. C. R. ; Guiomar, F. P. ; Monteiro, P.

Optics Express Vol. 30, Nº 20, pp. 36025 - 36025, September, 2022.

ISSN (print): 1094-4087
ISSN (online):

Scimago Journal Ranking: 1,23 (in 2021)

Digital Object Identifier: 10.1364/OE.465195

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In this work, we propose and experimentally demonstrate an entropy loading technique based on probabilistic constellation shaping for a visible light communication (VLC) system. The aggregated achievable bit rate of a multi-carrier signal is maximized, considering a given pre-estimated signal-to-noise ratio. A study of the ideal number of subcarriers and signal bandwidth was performed using multiplexed red, green and blue lasers diodes with a bandwidth of 1 GHz. With a 20 degree optical diffuser, the communication system is able to cover a wide area at a free-space distance of 0.90 m, while achieving a record aggregate bit rate of 31.2 Gbit/s for single-polarization RGB-VLC systems.