Transmit Power Allocation for Physical Layer Security in Cooperative Multi-Hop Full-Duplex Relay Networks
- Authors
- Lee, Jong-Ho; Sohn, Illsoo; Kim, Yong-Hwa
- Issue Date
- Oct-2016
- Publisher
- MDPI
- Keywords
- physical layer security; relay networks; full-duplex relay; power allocation; secrecy rate
- Citation
- SENSORS, v.16, no.10
- Journal Title
- SENSORS
- Volume
- 16
- Number
- 10
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/7849
- DOI
- 10.3390/s16101726
- ISSN
- 1424-8220
- 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.
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