Optimization of LED's SAHPs to simultaneously enhance SNR uniformity and support dimming control for visible light communication

被引：9

作者：

Li, Fang ^{[1
]}

Wu, Kan ^{[1
]}

Zou, Weiwen ^{[1
]}

Chen, Jianping ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, State Key Lab Adv Opt Commun Syst & Networks, Shanghai 200240, Peoples R China

来源：

OPTICS COMMUNICATIONS | 2015年 / 341卷

关键词：

Visible light communication; Signal to noise ratio; Dimming control; Subcarrier pulse position modulation; SCATTER SEARCH;

D O I：

10.1016/j.optcom.2014.12.025

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

In this paper, we propose a method to enhance signal to noise ratio (SNR) uniformity and simultaneously support dimming control via optimization of LEDs semi-angle at half power (SAHP) for visible light communication (VLC) systems. The uniformity of SNR performance is analyzed. Subcarrier-4pulse position modulation (SC-4PPM) is employed to supply light brightness control. Performance evaluation demonstrates that the overall SNR variation can be managed within 0.5 dB and the lowest SNR can be improved by nearly 5 dB for different dimming factors. A linear dimming control model is presented for the modulation parameters under optimal conditions. Tolerance analysis shows that our method is robust against practical parameters deviations. Feasibility evaluations show that the optimization demonstrates better performance than the non-optimized situations, both in SNR value and its distribution for various LED powers, receiver FOVs (field of view), LED numbers and room dimensions. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：218 / 227

页数：10

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