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Security outage performance of partial relay selection in AF mixed RF/FSO system with outdated channel state information
Author(s) -
Odeyemi Kehinde O.,
Owolawi Pius A.
Publication year - 2019
Publication title -
transactions on emerging telecommunications technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.366
H-Index - 47
ISSN - 2161-3915
DOI - 10.1002/ett.3555
Subject(s) - relay , rayleigh fading , channel state information , cumulative distribution function , fading , computer science , channel (broadcasting) , electronic engineering , topology (electrical circuits) , wireless , telecommunications , engineering , probability density function , mathematics , physics , electrical engineering , statistics , power (physics) , quantum mechanics
In this paper, the secrecy outage performance of a partial relay selection–based mixed radio frequency/free‐space optical (RF/FSO) system with outdated channel state information is studied. All the RF links are modeled in Rayleigh fading, and the FSO link is subjected to Gamma‐Gamma fading with/or without pointing errors in relation to the two detection techniques such as heterodyne detection and intensity modulation with direct detection. It is assumed that the relay nodes employ fixed gain and variable gain amplified‐and‐forward relaying protocols. Thus, unified cumulative distribution functions of the equivalent end‐to‐end signal to noise ratio for both the AF relaying schemes are then derived. Utilizing the cumulative distribution functions, the closed‐form expressions for the lower bound secrecy outage probability under the two relaying protocols are then obtained for the concerned system. Moreover, the impacts of turbulence, pointing errors, detection techniques, outdated channel state information, and relay selection are investigated. The finding demonstrated that the variable gain relaying mixed RF/FSO system offers much better secrecy performance compared with the fixed gain relaying system. Monte Carlo simulation results are provided to validate the accuracy of the analysis.