Location‐based information transmission systems using visible light communications

Abstract

Lighting systems are undergoing a revolution from fluorescent lamps or tubes to light emitting diodes that offer greater energy efficiency and a longer lifetime. This paper considers using these light sources to provide other benefits. The proposed system has low deployment cost and most importantly, it uses the unique characteristics of visible light to complement existing wireless communication systems. This paper outlines a system design with three features. First, it can provide a provable and secure wireless communication capability. In particular, a user is authenticated according to his or her location. Second, it includes indoor positioning systems with high precision. Finally, it also supports information broadcast with a high frequency reuse factor. This paper provides both experimental and theoretical results. We build the mathematical framework for the analysis of visible light positioning systems. Experimental results and analysis are given to explain the concerns of light sensors in a mobile phone for building an indoor positioning system. A novel authentication system based on users' locations is proposed. Copyright © 2015 John Wiley & Sons, Ltd.

A High-Precision Positioning Scheme Under Non-Point Visible Transmitters

“…Where ,0 is the received power from the ℎ transmitter at a reference distance ,0 away from that transmitter. However, the order of Lambertian emission in (2) is not 1 for nonideal LED and PDs [31]- [34]. Therefore, the path loss exponent in (3) is not 4.…”

Visible light communication – An architectural perspective on the applications and data rate improvement strategies

“…However, it fails to provide desirable results in metropolitan cities (with skyscrapers) and in indoor environments because of not having clear view to the sky, signal attenuation, multipath effect, etc. 8,9 In order to fill this gap, various indoor positioning systems primarily based on RF such as wireless fidelity (WiFi), Bluetooth, radio frequency identification, and camera-based positioning systems have been proposed in the works of Haute et al 10 and Mautz and Tilch. 11 Moreover, RF-based positioning techniques suffer from aforementioned issues, and camera-based positioning has a higher cost.…”

Angle diversity receiver for indoor MIMO visible light communications

“…• We take A = 15 mm 2 and k = 1.4738 because these are the values for Centronic OSD15-E PDs which we use for our practical experiments [13], [14]. • The receiver is fixed at a height h PD = 0.7 m. For the performance analysis, we will consider five positions with coordinates (0.5, 0.5), (1.0, 1.0), (2.5, 1.0), (2.0, 1.5) and (2.5, 2.5) as depicted in Fig.…”