Paper Title
Reliability Analysis of Level Crossing Warning using FSO / RF Communication System

In this paper, we have presented the cooperative free space optical (FSO) communication system with radio frequency (RF) backup as an application to the level crossing warning systems for Railways. Reliability analysis has been carried out to ensure the performance improvement over single link. Cooperative FSO link continues to work in the presence of rain in which the RF system fails.FSO system fails in the presence of fog whereas the RF system continues to work. The complementary nature of the system ensures that one of them gives desired performance in the presence of rain/fog. The effect of equipment failure, turbulence, pointing error, fog and rain has been studied in reliability analysis. Indexterms - Cooperative communication, FSO, Reliability analysis