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Secure wireless information and power transfer based on directionalmodulation is conceived for amplify-and-forward (AF) relaying networks.Explicitly, we first formulate a secrecy rate maximization (SRM) problem, whichcan be decomposed into a twin-level optimization problem and solved by aone-dimensional (1D) search and semidefinite relaxation (SDR) technique. Thenin order to reduce the search complexity, we formulate an optimization problembased on maximizing the signal-to-leakage-AN-noise-ratio (Max-SLANR) criterion,and transform it into a SDR problem. Additionally, the relaxation is proved tobe tight according to the classic Karush-Kuhn-Tucker (KKT) conditions. Finally,to reduce the computational complexity, a successive convex approximation (SCA)scheme is proposed to find a near-optimal solution. The complexity of the SCAscheme is much lower than that of the SRM and the Max-SLANR schemes. Simulationresults demonstrate that the performance of the SCA scheme is very close tothat of the SRM scheme in terms of its secrecy rate and bit error rate (BER),but much better than that of the zero forcing (ZF) scheme.

Secure SWIPT for Directional Modulation Aided AF Relaying Networks