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Sensors 2016, 16(10), 1726; doi:10.3390/s16101726

Transmit Power Allocation for Physical Layer Security in Cooperative Multi-Hop Full-Duplex Relay Networks

1
Department of Electronic Engineering, Gachon University, Seongnam 13120, Korea
2
Department of Electronic Engineering, Myongji University, Yongin 17058, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Leonhard M. Reindl
Received: 2 September 2016 / Revised: 29 September 2016 / Accepted: 12 October 2016 / Published: 17 October 2016
(This article belongs to the Section Sensor Networks)
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Abstract

In this paper, we consider a transmit power allocation problem for secure transmission in multi-hop decode-and-forward (DF) full-duplex relay (FDR) networks, where multiple FDRs are located at each hop and perform cooperative beamforming to null out the signal at multiple eavesdroppers. For a perfect self-interference cancellation (PSIC) case, where the self-interference signal at each FDR is completely canceled, we derive an optimal power allocation (OPA) strategy using the Karush-Kuhn-Tucker (KKT) conditions to maximize the achievable secrecy rate under an overall transmit power constraint. In the case where residual self-interferences exist owing to imperfect self-interference cancellation (ISIC), we also propose a transmit power allocation scheme using the geometric programming (GP) method. Numerical results are presented to verify the secrecy rate performance of the proposed power allocation schemes. View Full-Text
Keywords: physical layer security; relay networks; full-duplex relay; power allocation; secrecy rate physical layer security; relay networks; full-duplex relay; power allocation; secrecy rate
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Lee, J.-H.; Sohn, I.; Kim, Y.-H. Transmit Power Allocation for Physical Layer Security in Cooperative Multi-Hop Full-Duplex Relay Networks. Sensors 2016, 16, 1726.

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