Robust Joint Beamforming and Jamming for Secure AF Networks:Low-Complexity Design
Published in IEEE Transactions on Vehicular Technology, 2014
Abstract: This paper investigates the physical-layer security issue of an amplify-and-forward (AF) relay network. We propose a joint cooperative beamforming (CB) and cooperative jamming (CJ) design that is robust to the imperfect channel state information (CSI) of the multiple multiantenna eavesdroppers. The objective is the worst-case secrecy rate maximization (WCSRM). Based on the inner convex approximation and semidefinite relaxation (SDR) technique, the original nonconvex problem is transformed into a sequence of approximate convex problems, which can be solved conveniently. The proposed robust design guarantees to converge to a Karush–Kuhn–Tucker (KKT) solution and is efficient in computational complexity. Furthermore, we prove that SDR always has a rank-1 solution, which identifies that SDR is tight. Simulations demonstrate the validity of the proposed strategy.
Index Terms: Cooperative beamforming (CB), inner convex approxi mation (ICA), jamming, secrecy rate, semidefinite relaxation (SDR).
Recommended citation: Wang C, Wang H M. Robust joint beamforming and jamming for secure AF networks: Low-complexity design[J]. IEEE Transactions on Vehicular Technology, 2014, 64(5): 2192-2198.
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