Achieving High Energy Efficiency and Physical-Layer Security in AF Relaying

被引:67
|
作者
Wang, Dong [1 ,2 ]
Bai, Bo [1 ]
Chen, Wei [1 ]
Han, Zhu [3 ]
机构
[1] Tsinghua Univ, Dept Elect Engn, Beijing 100084, Peoples R China
[2] New Star Res Inst Appl Technol, Hefei 230031, Peoples R China
[3] Univ Houston, Dept Elect & Comp Engn, Houston, TX 77004 USA
关键词
Physical layer security; secure energy efficiency; power allocation; amplify-and-forward; relay networks; RESOURCE-ALLOCATION; OPTIMIZATION; NETWORKS; SECRECY; DESIGN;
D O I
10.1109/TWC.2015.2477510
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
For transmitting data in a secret and energy-efficient manner in collaborative amplify-and-forward relay networks, the secure energy efficiency (EE) defined as the secret bits transferred with unit energy is maximized to satisfy each node power constraint and target secrecy rate requirement, based on physical security framework. The secure EE is maximized by joint source and relay power allocation, which is a nonconvex optimization problem. To cope with this difficulty, a solution scheme and corresponding algorithms are developed by jointly applying fractional programming, exact penalty, alternate search, and difference of convex functions programming. The key idea of the scheme is to convert the primal problem into simple subproblems step by step, such that related methods are adopted. It is verified that, compared with secrecy rate maximization, the proposed scheme improves the secure EE significantly yet with a certain loss of the secrecy rate due to the tradeoff between secure EE and secrecy rate. Furthermore, the proposed scheme achieves higher secure EE and secrecy rate than total transmission power minimization does, while with a certain increase of power consumption. These results indicate that a reasonable balance among secure EE, secrecy rate, and power consumption can be reached by the proposed scheme.
引用
收藏
页码:740 / 752
页数:13
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