Journal
IEEE TRANSACTIONS ON INFORMATION FORENSICS AND SECURITY
Volume 14, Issue 12, Pages 3151-3159Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIFS.2019.2908481
Keywords
Physical layer security; full-duplex; artificial noise; secrecy beamforming; secrecy rate
Funding
- National Natural Science Foundation of China (NSFC) [61801518]
- Hubei Provincial Natural Science Foundation of China [2017CFB661]
- Engineering and Physical Sciences Research Council [EP/Noo4558/1, EP/PO34284/1]
- Project COALESCE by Royal Society's Global Challenges Research Fund Grant
- Project COALESCE by European Research Council's Advanced Fellow Grant QuantCom
- EPSRC [EP/P003990/1, EP/N004558/1, EP/J015520/1, EP/L010550/1] Funding Source: UKRI
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In this paper, we investigate the physical layer security of a full-duplex base station (BS)-aided system in the worst case, where an uplink transmitter (UT) and a downlink receiver (DR) are equipped with a single antenna, while a powerful eavesdropper is equipped with multiple antennas. For securing the confidentiality of signals transmitted from the BS and UT, an artificial noise (AN)-aided secrecy beamforming scheme is proposed, which is robust to the realistic imperfect state information of both the eavesdropping channel and the residual self-interference channel. Our objective function is that of maximizing the worst-case sum secrecy rate achieved by the BS and UT, through jointly optimizing the beamforming vector of the confidential signals and the transmit covariance matrix of the AN. However, the resulting optimization problem is non-convex and non-linear. In order to efficiently obtain the solution, we transform the non-convex problem into a sequence of convex problems by adopting the block coordinate descent algorithm. We invoke a linear matrix inequality for finding its Karush- Kuhn-Tucker (KKT) solution. In order to evaluate the achievable performance, the worst-case secrecy rate is analytically derived. Furthermore, we construct another secrecy transmission scheme using the projection matrix theory for performance comparison. Our simulation results show that the proposed robust secrecy transmission scheme achieves substantial secrecy performance gains, which verifies the efficiency of the proposed method.
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