Analysis Concerning the Usage of Visible Light Communications in Automotive Applications: Achievable Distances vs. Optical Noise

Considering the wide deployment of LED lighting sources in the transportation domain, automotive Visible Light Communications arise as a highly promising research area. Nevertheless, due to the high intensity of parasitic light sources associated to rather low power data signals numerous challenges emerge. In this context, this paper is focused on the analysis of linear transimpedance circuit performances in automotive applications. Thus, it presents an analysis regarding the influence of strong sunlight on the photosensitive element. The analysis involves the simulation of a microcontroller-assisted variable gain transimpedance circuit that enables the VLC system to prevent saturation by reducing its sensitivity. By considering the emitted irradiance of lighting systems existing in transportation infrastructure, the maximum communication distance is determined. The results show that a variable gain transimpedance circuit can enable communication distances between 9 and more than 150 meters depending on the sunlight power and on the VLC receiver field of view.