Paper Info
Title
Transmission capacity maximization for LED array-assisted multiuser VLC systems
Abstract
In this paper, we present a light-emitting diode (LED) array-assisted visible light communication (VLC) system. Considering the requirements of illumination, the human eye safety, and the energy saving, we optimize the optical power allocation (PA) to maximize the transmission capacity of the overall system. Specifically, we discuss two typical scenarios where the LED array in each room serves multiple users either simultaneously or in a round-robin manner. The problem corresponding to the first case turns out to be nonconvex whose globally optimal solution is hard to obtain. To address this difficult problem, we first adopt the famous gradient projection algorithm to obtain a locally optimal solution, then we employ powerful convex relaxation techniques, and achieve a high-quality solution. While for the round-robin case, we are able to derive an optimal solution in closed form by virtue of Karush-Kuhn-Tucker conditions. Interestingly, the derived closed-form solution follows a water-filling pattern with both square root and two-side clipping operations, which differs from the conventional water-filling-like PA in radiofrequency channels. Numerical results depict the performance advantage provided by the proposed PA strategies under various settings.
Year
DOI
Venue
2015
10.1007/s11432-015-5298-6
Science China Information Sciences
Keywords
DocType
Volume
light-emitting diodes, visible light communication, power allocation, multiuser transmission, convex relaxation, 发光二极管, 可见光通信, 功率分配, 多用户传输, 凸松弛, 082310
Journal
58
Issue
ISSN
Citations 
8
1869-1919
1
PageRank 
References 
Authors
0.43
12
6
Name
Order
Citations
PageRank
Lei Kong117315.87
Hong Shen210410.02
Wei Xu385463.23
Hua Zhang48614.74
Chunming Zhao567164.30
xiaohu you62529272.49