A Framework on the Performance Analysis of Dual-Hop Mixed FSO-RF Cooperative Systems

Statistical Analysis of Noise Propagation Effect for Mixed RF/FSO AF Relaying Application in Wireless Sensor Networks

“…For mixed RF/FSO systems, many works have been done to provide statistical analysis of γ e that mainly determines the system performance including outage probability (OP), average bit-error rate (BER) and ergodic capacity, etc. ( [7,10] and the references therein). However, in the existing models, γ e is not directly dealt with but an approximate version γ a = γ 1 γ 2 γ 1 +γ 2 is investigated instead of γ e [7,11].…”

“…In the evaluation of the mixed RF-FSO dual-hop systems in previous studies, RF link was represented by various models including Rayleigh, Rician, κ-µ, Nakagami-m, generalized Nakagami-m, generalized-K and Extended Generalized-K (EGK) fading. On the other hand, FSO link is assumed to suffer from Mâlaga-M, exponentiated-Weibull, Gamma-Gamma with pointing errors, and Double Generalized Gamma (DGG) (see [7] and the references therein).…”

“…( [7,10] and the references therein). However, in the existing models, γ e is not directly dealt with but an approximate version γ a = γ 1 γ 2 γ 1 +γ 2 is investigated instead of γ e [7,11]. γ a is sometimes further approximated by γ m = min{γ 1 , γ 2 } [10].…”

“…In this paper, we provide an exact analysis on the probability distribution of γ e and illustrate the noise propagation effect on the performances. Unlike the existing methodology based on a moment generating function (MGF) technique (e.g., [7,10]), the analysis in this paper mainly relies on the binomial-equation theorem [13] and the power series expansion of an exponential function [14]. Counting the noise power amplified at the relay, we could see the performance degradation due to the noise propagation in comparison to the approximate results.…”

“…We assume that RF and FSO link suffer from Nakagami-m and Gamma-Gamma fading with pointing errors, respectively. In [7] and [10], more generalized settings are used for modeling the fading channels but, to the best of our knowledge, no existing works have provided the exact statistical analysis of the mixed RF-FSO AF system with the power-constrained variable amplifying gain. The analysis provided in this paper is verified by simulation.…”