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Secure communications in multiple amplify‐and‐forward relay networks with outdated channel state information
Author(s) -
Deng Dan,
Fan Lisheng,
Zhao Rui,
Hu Rose Qingyang
Publication year - 2016
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.2985
Subject(s) - relay , secrecy , rayleigh fading , channel state information , computer network , computer science , relay channel , channel (broadcasting) , transmission (telecommunications) , selection (genetic algorithm) , expression (computer science) , fading , telecommunications , computer security , wireless , power (physics) , physics , quantum mechanics , artificial intelligence , programming language
This paper studies the effect of outdated channel state information on relay selection for a secure amplify‐and‐forward relay network. In the considered system, one of the multiple amplify‐and‐forward relays is selected to assist the secure transmission from the source to the destination, where secure transmission may be wiretapped by multiple eavesdroppers. To enhance the system security, two relay selection criteria are considered to choose the best relay, and the selection is performed in time‐varying Rayleigh block‐fading channel environments. We study the effect of the outdated channel state information on the system secrecy performance by deriving the analytical secrecy outage probability as well as the asymptotic expression with main‐to‐eavesdropper ratio. From the asymptotic expressions, it can be found that the diversity order of the secrecy outage probability for both the criteria remains unity, regardless of the number of relays and the number of eavesdroppers. Copyright © 2015 John Wiley & Sons, Ltd.