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In this paper we propose a simulation method using numerical integration, anddevelop a closed-form link loss model for physical layer channelcharacterization for non-line of sight (NLOS) ultraviolet (UV) communicationsystems. The impulse response of the channel is calculated by assuming bothuniform and Gaussian profiles for transmitted beams and different geometries.The results are compared with previously published results. The accuracy of theintegration approach is compared to the Monte Carlo simulation. Then the pathloss using the simulation method and the suggested closed-form expression arepresented for different link geometries. The accuracies are evaluated andcompared to the results obtained using other methods.

NLOS UV Channel Modeling Using Numerical Integration and an Approximate Closed-Form Path Loss Model