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Tight Bounds on Channel Capacity for Dimmable Visible Light Communications

Wang, Jun-Bo, Hu, Qing-Song, Wang, Jiangzhou, Chen, Ming, Wang, Jin-Yuan (2013) Tight Bounds on Channel Capacity for Dimmable Visible Light Communications. Journal of Lightwave Technology, 31 (23). pp. 3771-3779. ISSN 0733-8724. (doi:10.1109/JLT.2013.2286088) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided) (KAR id:37152)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided. (Contact us about this Publication)
Official URL
http://dx.doi.org/10.1109/JLT.2013.2286088

Abstract

In this paper, the upper and lower bounds for the channel capacity of dimmable visible light communications(VLC) systems are investigated. Because the information is modulated into the instantaneous optical intensity, the transmitted optical intensity is represented by a nonnegative input that is corrupted by an additive white Gaussian noise. Considering the illumination support in a VLC system, the transmitted optical intensity signal must satisfy the illumination constraint, i.e., the average transmitted optical intensity is constrained by a target illumination intensity, which is determined by the nominal optical intensity of the light source devices and dimming target. An upper bound on the channel capacity is derived based on the signal space geometry via a sphere packing argument. A lower bound on the channel capacity is derived by maximizing the mutual information between the channel input and output. Both the upper and lower bounds are presented in closed forms. Furthermore, a closed-form optimal intensity distribution of the transmitted optical signal is obtained. The numerical results show that the presented bounds are very tight at the application zone of dimmable VLC links.

Item Type: Article
DOI/Identification number: 10.1109/JLT.2013.2286088
Uncontrolled keywords: AWGN channels channel capacity light transmission numerical analysis optical communication optical links additive white Gaussian noise channel capacity closed-form optimal intensity distribution dimmable VLC links dimmable visible light communications dimming target illumination constraint information modulation instantaneous optical intensity light source devices numerical analysis signal space geometry sphere packing target illumination intensity transmitted optical intensity Channel capacity dimmable visible light communications lower bound sphere packing argument upper bound Channel capacity Lighting Optical fiber communication Optical modulation Optical pulses Optical receivers Optical transmitters
Subjects: T Technology
Divisions: Faculties > Sciences > School of Engineering and Digital Arts
Faculties > Sciences > School of Engineering and Digital Arts > Broadband & Wireless Communications
Depositing User: Tina Thompson
Date Deposited: 03 Dec 2013 11:31 UTC
Last Modified: 12 Feb 2020 04:05 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/37152 (The current URI for this page, for reference purposes)
Wang, Jiangzhou: https://orcid.org/0000-0003-0881-3594
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