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Distributionally Robust Physical Layer Secrecy Design for Full-Duplex Two-Way Relay System

Distributionally Robust Physical Layer Secrecy Design for Full-Duplex Two-Way Relay System

Authors :
Xiaoxiao Wu
Jingran Lin
Qiang Li
Chao Li
Jiayi Li
Source :
GLOBECOM Workshops
Publication Year :
2017
Publisher :
IEEE, 2017.

Abstract

This paper deals with the physical-layer (PHY) security problem for a full-duplex (FD) two-way relay system, where two FD sources exchange confidential information through an FD relay. Assuming imperfect channel state information (CSI) of the eavesdropper (Eve), we aim for a robust amplify-andforward (AF) relaying scheme that maximizes the sum secrecy rate of the two-way transmissions. Different from the widely used norm-bounded deterministic error model and the Gaussian random error model, we adopt a moment-based random error model to capture the imperfection of Eve's CSI. Specifically, the CSI error is assumed to be randomly distributed with given mean and covariance, but the exact distribution or other highorder statistics are not known. Under this moment-based error model, we formulate an outage-constrained sum secrecy rate maximization (OC-SRM) problem, which guarantees the outage sum secrecy rate is kept below certain threshold for arbitrary distributions fulfilling the mean and covariance. To tackle this OC-SRM problem, we first reexpress the outage probability into a more explicit form, and then develop a semidefinite relaxation (SDR)-based alternating difference-of-concave (DC) programming approach to computing a safe solution. Simulation results corroborate the robustness of the proposed design when varying the Eve's CSI error distribution.

Details

Database :
OpenAIRE
Journal :
2017 IEEE Globecom Workshops (GC Wkshps)
Accession number :
edsair.doi...........5fad1914cbd31132f89dfa5ae596ba16
Full Text :
https://doi.org/10.1109/glocomw.2017.8269116