This paper discusses the implementation of a light emitting diode based visible light communication system, for intelligent transportation in road safety applications. The signal processing of both, transmitter and receiver are realized in a field programmable gate array using two Spartan-3E development kits. The implemented modulation scheme is based on direct sequence spread spectrum techniques. The performance of the overall system is evaluated and results are presented. It is found that the system is well suited for traffic broadcast at low data rate and medium range. The simulation results also show that spread spectrum modulation techniques mitigate the effect of noise produced by ambient artificial light sources.
Dr. Navin Kumar, Terra, D., Lourenco, N., Alves, L. Nero, and Aguiar, R. L., “Visible light communication for intelligent transportation in road safety applications”, in 2011 7th International Wireless Communications and Mobile Computing Conference, Istanbul, Turkey, 2011.