Frontiers of Information Technology & Electronic Engineering
>> 2017,
Volume 18,
Issue 6
doi:
10.1631/FITEE.1601832
Article
Joint cooperative beamforming and artificial noise design for secureAF relay networks with energy-harvesting eavesdroppers
College of Communications Engineering, PLA University of Science and Technology, Nanjing 210007, China
Available online: 2017-08-28
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Abstract
In this paper, we investigate physical layer security for simultaneous wireless information and power transfer in amplify-and-forward relay networks. We propose a joint robust cooperative beamforming and artificial noise scheme for secure communication and efficient wireless energy transfer. Specifically, by treating the energy receiver as a potential eavesdropper and assuming that only imperfect channel state information can be obtained, we formulate an optimization problem to maximize the worst-case secrecy rate between the source and the legitimate information receiver under both the power constraint at the relays and the wireless power harvest constraint at the energy receiver. Since such a problem is non-convex and hard to tackle, we propose a two-level optimization approach which involves a one-dimensional search and semidefinite relaxation. Simulation results show that the proposed robust scheme achieves better worst-case secrecy rate performance than other schemes.
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