Visible light communications cooperative architecture for the intelligent transportation system

This paper presents the experimental results for a cooperative system that uses Infrastructure-to-Vehicle (I2V) and Vehicle-to-Vehicle (V2V) communication to increases the traffic safety, efficiency and adaptability. The wireless communication technique chosen to enable the data transmission is Visible Light Communication (VLC) due to its numerous advantages. The system consists of a commercial LED-based traffic light as a Road-Side-Unit (RSU) emitter, a transceiver that receives the message from the traffic light and retransmits it to the vehicle behind by using the tail lights, and also a second receiver that receives the message from the transceiver. Measurements exhibit a Bit Error Ratio of 10^-7, both for the I2V and V2V, without using any complex error correction codes, which is considered good, even for traffic safety applications. The tests results show that the proposed cooperative system allows the RSU to communicate with vehicles outside the service area by using multi-hop communication.