Modelling of Fade Duration Statistics in Earth-Satellite Slant Paths Using Copulas

摘要

Satellite signals in high frequency bands are severely affected by rain, resulting in signal fades. The estimation of fade duration statistics is essential for the design of more efficient fade mitigation techniques for the Earth- satellite communication system. In this paper we present a novel approach for modelling the conditional probability of occurrence of fades and conditional probability of fade time exceeding certain duration and certain attenuation threshold. The method is based on the copula theory for single site slant paths as well as two or multiple site diversity systems. Several copula functions have been tested with good results in the fitting to experimental data. The proposed method may play an important role in the proposing new models for single site fade duration with better performance compared to other existing models and new joint fade duration prediction models in site diversity systems which do not exist yet.