Location-based Information Transmission Systems using Visible Light Communications

Lighting systems are undergoing a revolution from fluorescent lamps or tubes to light emitting diodes which 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/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. It presents techniques for using visible light communication (VLC) under different channel characteristics. In addition, we report different signal processing approaches in connection with VLC and their fundamental limits.