Open AccessExploiting the relays’ backup RF antennas for enhanced FSO cooperative communications
Author(s) -
Chadi Abou-Rjeily,
Mustapha Hamad
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.014545
Subject(s) - computer science , relay , rician fading , network packet , fading , backup , free space optical communication , electronic engineering , transmission (telecommunications) , rayleigh fading , context (archaeology) , computer network , telecommunications , optical communication , physics , engineering , channel (broadcasting) , power (physics) , paleontology , quantum mechanics , database , biology
This paper investigates a novel method for boosting the performance of parallel-relaying decode-and-forward (DF) cooperative free space optical (FSO) networks. The proposed solution takes advantage from the presence of the radio frequency (RF) links that are often established to backup the FSO links in practical systems. In this context, the low speed RF links are used for carrying the information packets that have not been delivered along the direct FSO link for the sake of sharing these packets among the relays in a simple and efficient manner. This packet sharing enhances the chances for correct detection at the relays thus increasing the number of relays that will participate in the relay-destination transmission phase. An exact outage probability analysis is carried out in the case of gamma-gamma FSO fading channels with pointing errors and of Rician/Rayleigh RF fading channels. At a second time, the cut-set method is applied for deriving a simple and tractable upper-bound that is useful for evaluating the asymptotic performance and diversity gain.