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• W2018799072 abstract "This paper presents an investigation of the secrecy performance of amplify-and-forward (AF) distributed beamforming (DBF) and opportunistic relaying (OR) through K untrustworthy relays. The capacity scaling and achievable diversity order of a secure communication are derived for K → ∞ and in high signal-to-noise-ratio (SNR) regimes, respectively. The DBF is shown to convey confidential messages with a capacity scaling of 1/2 log K regardless of the trustworthiness of the relays, even without intended jamming (IJ), where 1/2 log K corresponds to the maximal capacity scaling of cooperative relaying in non-eavesdropping environments. However, using multiple untrustworthy relays worsens the secrecy performance of the OR, and as K increases, the secrecy capacity converges to zero. When secrecy outage performance with IJ is considered, the achievable diversity order for both the DBF and OR is limited to one. However, only the DBF exploits the benefits using multiple untrustworthy relays, and its secrecy outage probability decreases exponentially as K increases." @default.
• W2018799072 created "2016-06-24" @default.
• W2018799072 creator A5027010503 @default.
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• W2018799072 date "2015-07-01" @default.
• W2018799072 modified "2023-09-25" @default.
• W2018799072 title "Capacity Scaling and Diversity Order for Secure Cooperative Relaying With Untrustworthy Relays" @default.
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• W2018799072 doi "https://doi.org/10.1109/twc.2015.2413784" @default.
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