Secrecy Analysis of Amplify-and-Forward Relay Networks with Beamforming

• Pu Chen,
• Jian Ouyang,
• Wei-Ping Zhu,

Vol. 10, No. 10, October 30, 2016
10.3837/tiis.2016.10.022, Download Paper (Free):

• physical layer security
• relay network
• secrecy outage probability
• average secrecy rate
• beamforming

Abstract

This paper analyzes the secrecy performance of an amplify-and-forward (AF) relay network, where a multi-antenna eavesdropper attempts to overhear the transmitted message from a multi-antenna source to a multi-antenna destination with a single antenna relay. Firstly, we derive the approximate analytical expressions for the secrecy outage probability (SOP) and average secrecy rate (ASR) of the relay network. Then, asymptotic expressions of SOP and ASR at high main-to-eavesdropper ratio (MER) are also provided to reveal the diversity gain of the secure communication. Finally, numerical results are given to verify the theoretical analysis and show the effect of the number of antennas in the considered relay network.

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