Spectrum-sliced wavelength division multiplexing based free space optical communication considering wind speed and rainfall parameters

Free space optical system (FSO) is a wireless communication system which offers unlicensed spectrum with low cost of deployment. Losses caused by atmospheric turbulence are an enormous challenge for FSO systems. These losses are modeled by Gamma-Gamma model. The Gamma-Gamma model is used to represent moderate to strong turbulence. This model considers wind velocity, but does not consider Rainfall parameter for the calculation of refractive index structure parameter Cn2. In this research paper, we have considered effect of heavy rainfall as well as rms value of strong wind velocity which exist in hilly terrains. This modified model for the proposed spectrum-sliced wavelength division multiplexing (SS-WDM) FSO communication link incorporates differential phase shift keying (DPSK) between the popular high altitude Nilgiris Mountains from the state of Tamilnadu, India. Simulation of conventional model and the modified model by considering rainfall parameter as well as wind velocity has been demonstrated using meteorological data. The results in terms of Eye diagrams, and performance metrics such as Bit error rate (BER), log (BER), Q-factor, and Maximum eye height indicate that the modified model is more accurate for maintaining foolproof and efficient FSO communication link.