ABER Estimation of NLOS UV Links with Time Diversity over K-Turbulent Channels and Path Loss.

Recent major advances in semiconductor and ultraviolet (UV) light devices have paved the way for the establishment of non-line of sight (NLOS) optical wireless communication (OWC) links which operate within the so-called solar blind (UV-C) spectral band in the range of 200nm-280nm. Considering that the propagating information-bearing UV light primarily addresses scattering and atmospheric turbulence-induced scintillations, here we evaluate the average bit error rate (ABER) performance of typical NLOS UV-C link configurations over strong turbulent channels along with path loss due to strong scattering. In this respect, we adopt the well-known single scattering model, while we introduce K distribution model as an accurate alternative to model strong turbulence-induced signal scintillations in the UV-C regime. Additionally, the time diversity method is used in the UV communication area to considerably enhance the investigated ABER availability. Under these circumstances novel ABER expressions are derived. Their corresponding results that illustrate various link configurations are further validated by Monte Carlo simulations and highlight therefore the accuracy of our proposed analysis and suggestions.