Secure SWIPT for Directional Modulation Aided AF Relaying Networks
Xiaobo Zhou, Jun Li, Feng Shu, Qingqing Wu, Yongpeng Wu, Wen Chen, and, Hanzo Lajos

TL;DR
This paper proposes new optimization schemes for secure wireless information and power transfer in directional modulation aided AF relaying networks, achieving high secrecy rates with reduced computational complexity.
Contribution
It introduces a novel SCA-based scheme that approximates optimal solutions efficiently, outperforming traditional methods like ZF and reducing search complexity.
Findings
SCA scheme achieves near-optimal secrecy rate and BER performance.
Proposed methods outperform zero forcing scheme.
Relaxation techniques are proven to be tight under KKT conditions.
Abstract
Secure wireless information and power transfer based on directional modulation is conceived for amplify-and-forward (AF) relaying networks. Explicitly, we first formulate a secrecy rate maximization (SRM) problem, which can be decomposed into a twin-level optimization problem and solved by a one-dimensional (1D) search and semidefinite relaxation (SDR) technique. Then in order to reduce the search complexity, we formulate an optimization problem based on maximizing the signal-to-leakage-AN-noise-ratio (Max-SLANR) criterion, and transform it into a SDR problem. Additionally, the relaxation is proved to be 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 SCA scheme is much lower than that of the SRM and the…
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Taxonomy
TopicsEnergy Harvesting in Wireless Networks · Wireless Communication Security Techniques · Advanced Wireless Communication Technologies
