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International audience; — This paper presents an easy-to-use sensor aimed for traffic safety applications using visible light communications. A central problem in this area is the design of a suitable sensor able to enhance the conditioning of the signal and to avoid disturbances due to the environmental conditions. The visible light communication sensor proposed in this article addresses these issues and enables a robust communication for short to medium distances. The presentation is focused on hardware aspects and low-level coding techniques. The experimental validation of the proposed sensor has been conducted by analyzing communication performances between a commercial traffic light and the sensor, for distances up to 50 m. The measurements exhibit bit error ratio lower than 10-7 in an outdoor configuration, using two well-known codes (Manchester and Miller) without any error-correcting codes or complex signal processing. The prototype is aimed for automotive applications but other outdoor configurations can also be addressed by slight changes in the system design. Index Terms— infrastructure to vehicle communication, robust sensor, smart lighting systems, vehicle safety applications, visible light communications.

International audience; This paper approaches the issues concerning theusage of the delay modulation as a coding technique used foroutdoor Visible Light Communications (VLC) under PHY I layerof the IEEE 802.15.7 standard. We perform a comparativeanalysis between the Manchester code, as a traditional code,specified by the upper mentioned standard and the Miller code asa possible candidate for outdoor MIMO applications. Simulationand experimental results are provided, offering an overviewover the multi-channel, flickering and Bit Error Ratio (BER)performances.

This paper proposes a new architecture for outdoor low data rate visible light communication applications. Considering the performances of the digital filtering, the proposed architecture considers the usage of digital signal processing (DSP) as an alternative to the analog signal treatment. The key aspects related with the implementation of the VLC receiver are discussed and motivated through simulations. The simulation results demonstrate the performances of the proposed VLC receiver for different noise levels.

International audience; Since a few years, the vehicle industry tends to increase the performances of the lights based on led technologies. Nowadays, led systems are used as a standard by motor vehicles manufacturers. Led lights present higher reliability and are more flexible regarding the design or power adjustments. Furthermore, led systems are also very convenient for intensity modulation like in telecommunication fields. We developed a very simple data transmission system based on led that aims to be highly robust at short or medium distances - a few meters up to 15 meters. This visible light communication is dedicated to the cooperation between vehicles and road infrastructures to enhance the security of the traffic. This paper explains the choices and first results on the data transmission performances. In this paper, we present a first prototype of the system we made and experimental results.