Reliability-Security Tradeoff for Secure Transmission with Untrusted Relays

Dechuan CHEN  Weiwei YANG  Jianwei HU  Yueming CAI  Xin LIU  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E99-A   No.12   pp.2597-2599
Publication Date: 2016/12/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E99.A.2597
Type of Manuscript: LETTER
Category: Communication Theory and Signals
physical layer security,  connection outage probability,  secrecy outage probability,  secrecy throughput,  

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In this paper, we identify the tradeoff between security and reliability in the amplify-and-forward (AF) distributed beamforming (DBF) cooperative network with K untrusted relays. In particular, we derive the closed-form expressions for the connection outage probability (COP), the secrecy outage probability (SOP), the tradeoff relationship, and the secrecy throughput. Analytical and simulation results demonstrate that increasing K leads to the enhancement of the reliability performance, but the degradation of the security performance. This tradeoff also means that there exists an optimal K maximizing the secrecy throughput.