Performance Analysis of Decode-and-Forward based Hybrid RF/FSO-VLC system

Abstract

This paper presents performance analysis of decode-and-forward (DF) based asymmetric relaying system, where an outdoor hybrid radio frequency (RF)/free space optical communication (FSO) subsystem is connected with an indoor visible light communication (VLC) subsystem. The RF link is characterized by Nakagami-m fading and the FSO link is characterized by Double Generalized Gamma (DGG) distributed turbulence and Rayleigh distributed pointing errors. Novel mathematical expressions are derived for probability density function and cumulative distribution function of the instantaneous signal-to-noise-ratio (SNR) of hybrid RFIFSO-VLC cooperative system in terms of Meijer-G function. Using these, analytical expressions are obtained for the outage probability (OP) and the average bit error rate (BER) of the proposed system for different modulation techniques in terms of Meijer-G function. The numerical results show that the OP of the system increases as the effects of fading and pointing error increases. The results also show that the BER performance of the system is better in the moderate turbulence environment and using coherent binary detection schemes as compared to strong turbulence scenarios and using direct detection scheme.