Secrecy Rate of Two-Hop AF Relaying Networks with an Untrusted Relay

Authors:
Nanrun Zhou;Xun Chen;Chisheng Li;Zhi Xue
Affiliations:
Department of Electronic Information Engineering, Nanchang University, Nanchang, China 330031 and Shanghai Key Laboratory of Integrate Administration Technologies for Information Security, Shangha ...;Department of Electronic Information Engineering, Nanchang University, Nanchang, China 330031 and Shanghai Key Laboratory of Integrate Administration Technologies for Information Security, Shangha ...;Department of Electronic Information Engineering, Nanchang University, Nanchang, China 330031;Shanghai Key Laboratory of Integrate Administration Technologies for Information Security, Shanghai Jiao Tong University, Shanghai, China 200240
Venue:
Wireless Personal Communications: An International Journal
Year:
2014

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Abstract

Two cooperative communication protocols, two-way and one-way half-duplex relayings, are investigated and then compared in the amplify-and-forward (AF) mode. The relay is assumed to play the roles of eavesdropper and relay (i.e., an untrusted relay). With a fair power constraint at each node, the secrecy rate of the one-way relaying protocol is proved to be zero strictly. For the two-way relaying protocol, the signal-to-noise ratio (SNR) threshold is derived, above which the secrecy rate is non-zero. Defining a parameter, namely mistrust level, and non-zero secrecy rate can be achieved for the one-way relaying protocol in certain range of the mistrust level at high SNR. With a fair total power constraint, no matter how unreliable the relay is, the two-way AF half-duplex relaying protocol is proved to be a better choice under high SNR.