title: Transmit Power Allocation for Physical Layer Security in Cooperative Multi-Hop Full-Duplex Relay Networks.
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.
authors.affiliation: Department of Electronic Engineering, Gachon University, Seongnam 13120, Korea. jongho.lee@gachon.ac.kr.
authors.forename: Jong-Ho
authors.initials: JH
authors.lastname: Lee
authors.affiliation: Department of Electronic Engineering, Gachon University, Seongnam 13120, Korea. illsoo.sohn@gachon.ac.kr.
authors.forename: Illsoo
authors.initials: I
authors.lastname: Sohn
authors.affiliation: Department of Electronic Engineering, Myongji University, Yongin 17058, Korea. yongkim@mju.ac.kr.
authors.forename: Yong-Hwa
authors.initials: YH
authors.lastname: Kim
keywords: full-duplex relay; physical layer security; power allocation; relay networks; secrecy rate