Paper Info
Title
Biased Multi-LED Beamforming for Multicarrier Visible Light Communications.
Abstract
Visible light communication (VLC) equipped with multiple light-emitting diodes (LEDs) can provide near ubiquitous indoor coverage for both communication and illumination. This paper introduces the concept of biased beamforming to explore the full potential of multicarrier multi-LED VLC systems. Biased beamforming includes two components to be jointly designed: a direct current (DC) bias on each LED and a beamforming vector on each subcarrier. We first analyze the impact on clipping in multi-LED VLC systems. Next, we consider the joint optimization of beamforming and biasing to maximize data rate. We find the optimal beamformer and analytically characterize its structure. We further optimize the bias on each LED and provide the globally optimal solution in closed form for flat channels, which leads to several critical insights that are helpful for practical systems. We also derive a simplified near-optimal solution for dispersive channels and develop an efficient method for biased beamforming. The performance of the proposed biased beamforming design outperforms existing solutions.
Year
DOI
Venue
2018
10.1109/JSAC.2017.2774539
IEEE Journal on Selected Areas in Communications
Keywords
Field
DocType
Light emitting diodes,Array signal processing,Lighting,Integrated optics,Time-domain analysis,Optical receivers,Optical modulation
Subcarrier,Beamforming,Computer science,Diode,Communication channel,Real-time computing,Electronic engineering,Visible light communication,Data rate,Light-emitting diode,Biasing
Journal
Volume
Issue
ISSN
36
1
0733-8716
Citations 
PageRank 
References 
1
0.35
21
Authors
6
Name
Order
Citations
PageRank
Ling, X.1246.48
Jiaheng Wang277151.96
Xiao Liang34410.89
Zhi Ding41574109.20
Chunming Zhao567164.30
Xiqi Gao63043217.05