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Information 2016, 7(3), 38; doi:10.3390/info7030038

Beamforming and Antenna Grouping Design for the Multi-Antenna Relay with Energy Harvesting to Improve Secrecy Rate

Chongqing Key Laboratory of Mobile Communications Technology, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
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Academic Editor: Lorenzo Mucchi
Received: 27 April 2016 / Revised: 29 June 2016 / Accepted: 1 July 2016 / Published: 13 July 2016
(This article belongs to the Special Issue Physical Layer Security in Wireless Networks)
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Abstract

The physical security strategy in the wireless network with a single-antenna eavesdropper is studied. The information transmits from a single-antenna source to a single-antenna destination, and an energy-limited multi-antenna relay is employed to forward information. The antennas of the relay are divided into two groups. One group receives and forwards information, and the other converts the received signal into energy. Beamforming is used by the relay to prevent the eavesdropper from intercepting confidential information. For the purpose of maximizing the secrecy rate, antenna grouping and beamforming vectors are designed. A low complexity scheme of antenna grouping is presented. The simulation results show that the secrecy rate can be significantly improved by arranging part of the antennas for energy harvesting, and part for forwarding and optimizing the beamforming vector at the relay. The antenna grouping scheme significantly reduces the computational complexity at the cost of acceptable performance loss. View Full-Text
Keywords: physical layer security; energy harvesting; multi-antenna relay; beamforming; antenna grouping; secrecy rate physical layer security; energy harvesting; multi-antenna relay; beamforming; antenna grouping; secrecy rate
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Lei, W.; Zhan, M. Beamforming and Antenna Grouping Design for the Multi-Antenna Relay with Energy Harvesting to Improve Secrecy Rate. Information 2016, 7, 38.

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