Abstract
The usage of Visible Light Communications (VLC) technology in automotive applications is very promising. Nevertheless, in outdoor conditions, the performances of existing VLC systems are strongly affected by the sun or other sources of light. In such situations, the strong parasitic light can saturate the photosensitive element and block data communication. To address the issue, this article analyzes the usage of an adaptive logarithmic transimpedance circuit as an alternative to the classical linear transimpedance circuit. The simulation and experimental evaluation demonstrate benefits of the proposed technique, as it significantly expands the communication distance and optical noise functionality range of the VLC systems and reduces the possibility of photoelement saturation. As a result, this approach might enable outdoor VLC sensors to work in strong sun conditions, the experimental results confirming its validity not only in the laboratory but also in outdoor conditions. A reliable 50 m communication distance is reported for outdoor sunny conditions using a standard power traffic light VLC emitter and a PIN photodiode VLC sensor.
Highlights
Visible Light Communications (VLC) represent a new wireless communication technology which transforms a basic LED lighting device into an intelligent dual purpose tool used for lighting and communications simultaneously [1,2,3,4]
This work is not referring to vehicular VLC, it points out again that in general, experimental evaluations are lower in performance than the results provided by simulations
Unlike in other works, the VLC sensor is based on a logarithmic transimpedance circuit instead of a linear transimpedance circuit
Summary
Visible Light Communications (VLC) represent a new wireless communication technology which transforms a basic LED lighting device into an intelligent dual purpose tool used for lighting and communications simultaneously [1,2,3,4]. In VLC, the communication feature is achieved by modulating the data onto the instantaneous power of the optical carrier at rates that are imperceptible for the human eye [5]. The data communication is achieved without perturbing in any way the primary function of the lighting device and without using any extra power to generate the carrier wave. In these conditions, the VLC technology is favored by the wide distribution of light sources. From a hardware point of view, the VLC technology can be viewed as half
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