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Joint Beamforming and Time Switching Design for Secrecy Rate Maximization in Wireless-Powered FD Relay Systems
- Source :
- IEEE Transactions on Vehicular Technology. 67:567-579
- Publication Year :
- 2018
- Publisher :
- Institute of Electrical and Electronics Engineers (IEEE), 2018.
-
Abstract
- This paper focuses on the secure transmission of wireless-powered full-duplex (FD) relay systems, where a multiantenna source communicates with a single-antenna destination with the help of a FD relay in the presence of a single-antenna eavesdropper. It is assumed that the FD relay is wireless energy harvesting-enabled, adopting both transmit and receive antennas to harvest energy in a time switching (TS) mode. As the objective of this paper is to maximize the system secrecy rate through jointly designing the energy beamforming vector, the information beamforming vector and the TS coefficient, an optimization problem is formulated. The formulated problem is proved to be nonconvex and the challenge to solve which is to concurrently solve out the three variables. To cope with this difficulty, an iterative algorithm is proposed to convert the formulated optimization problem into three convex subproblems, based on which the closed form solutions for the beamforming vectors are derived and the TS coefficient is obtained. Convergence property of the iterative method is analyzed. Simulations are also done to verify the theoretical derivations in terms of the convergence speed and the secrecy rate. Results reveal that the secrecy rate performance of exploiting transmit antenna together with receive antenna for energy harvesting at the FD relay outperforms only receive antenna case. Moreover, although there exists loopback interference between antennas, the FD relaying can always substantially boost the secrecy rate compared with half-duplex relaying architecture.
- Subjects :
- Beamforming
Engineering
Optimization problem
Computer Networks and Communications
Iterative method
Loopback
Aerospace Engineering
Data_CODINGANDINFORMATIONTHEORY
02 engineering and technology
law.invention
0203 mechanical engineering
Relay
law
Control theory
Computer Science::Networking and Internet Architecture
0202 electrical engineering, electronic engineering, information engineering
Electronic engineering
Wireless
Electrical and Electronic Engineering
Secure transmission
Computer Science::Information Theory
business.industry
ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS
020206 networking & telecommunications
020302 automobile design & engineering
Automotive Engineering
Antenna (radio)
business
Subjects
Details
- ISSN :
- 19399359 and 00189545
- Volume :
- 67
- Database :
- OpenAIRE
- Journal :
- IEEE Transactions on Vehicular Technology
- Accession number :
- edsair.doi...........9bfdc798b604b5115170cfebcd5d7eb6