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

被引：12
|
作者：
Zhou, Nanrun [1 ,2 ]
Chen, Xun [1 ,2 ]
Li, Chisheng [1 ]
Xue, Zhi [2 ]
机构：
[1] Nanchang Univ, Dept Elect Informat Engn, Nanchang 330031, Peoples R China
[2] Shanghai Jiao Tong Univ, Shanghai Key Lab Integrate Adm Technol Informat S, Shanghai 200240, Peoples R China
来源：
WIRELESS PERSONAL COMMUNICATIONS | 2014年 / 75卷 / 01期
基金：
中国国家自然科学基金;
关键词：
Relaying protocol; Physical layer security; Amplify-and-forward mode; Untrusted relay; Cooperative communication; WIRE-TAP CHANNEL; PERFORMANCE;
D O I：
10.1007/s11277-013-1351-1
中图分类号：
TN [电子技术、通信技术];
学科分类号：
0809 ;
摘要：
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.
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页码：119 / 129
页数：11
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