Open AccessThe impact of dual‐signal selection and multiple eavesdroppers on secrecy performance in cooperative‐relay systems
Author(s) -
Lee Donghun
Publication year - 2022
Publication title -
iet communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.355
H-Index - 62
eISSN - 1751-8636
pISSN - 1751-8628
DOI - 10.1049/cmu2.12306
Subject(s) - nakagami distribution , fading , secrecy , relay , computer science , selection (genetic algorithm) , signal to noise ratio (imaging) , diversity gain , signal (programming language) , telecommunications , computer network , computer security , decoding methods , physics , artificial intelligence , power (physics) , quantum mechanics , programming language
This paper investigates the impact of a dual‐signal selection (i.e. selection of direct signal and relay signal) and multiple eavesdroppers on secrecy outage probability in cooperative‐relay systems over Nakagami fading channels. This work performs the derivation of the new exact and approximate distributions for the received signal to noise ratio of the dual‐signal selection in analytical forms where maximal‐ratio combining and selection combining are considered in the presence of multiple eavesdroppers. The lower bounds on the secrecy outage probability of the dual‐signal selection are derived for various receiver scenarios over Nakagami fading channels. This paper also quantifies the secrecy diversity order of the proposed scheme and shows that the dual‐signal selection provides a secrecy diversity order gain ofλ d = m d UM s M ucompared to the conventional scheme by the dual‐signal selection. From the numerical results, this work observes that the sharpness of the dual‐signal selection for the secrecy performance curve is improved by the number of user nodes and fading index of the direct signal, while the number of eavesdroppers and fading index of the eavesdropper slightly affect the required signal to noise ratio of the proposed scheme to satisfy the secrecy outage probability.