Open AccessSecure beamforming design of SWIPT relay network with multiple users and eavesdroppers
Author(s) -
Lei He,
Taoshen Li,
Baber,
Zhe Wang,
Mingyu Lu,
Anni Shi,
Qing Zhu
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1607/1/012028
Subject(s) - beamforming , relay , maximum power transfer theorem , computer science , artificial noise , mathematical optimization , wireless , transmitter power output , node (physics) , optimization problem , transmission (telecommunications) , relaxation (psychology) , power (physics) , computer network , algorithm , transmitter , mathematics , telecommunications , engineering , physical layer , channel (broadcasting) , physics , quantum mechanics , psychology , structural engineering , social psychology
This paper studies the secure beamforming design for simultaneous wireless information and power transfer (SWIPT) in a amplify-and-forward (AF) relay networks with multiple users and eavesdroppers. Each user node adopts the power splitting (PS) scheme to decode information and harvest energy simultaneously. Our objective is to minimize the total relay transmit power under the constraints of secure transmission rate and energy harvesting requirements by jointly optimizing the beamforming matrix, artificial noise covariance matrix and PS ratios. For this non-convex problem, we propose a two-stage optimization approach to convert the original problem into two sub-problems. The first subproblem uses semidefinite relaxation (SDR) technique to transform the original problem into a convex problem, and then finds the optimal solution of the second subproblem through k-dimensional exhaustive search algorithm. Furthermore, we also propose a low complexity suboptimal solution scheme based on particle swarm optimization (PSO) algorithm. Simulation results show that the proposed scheme saves transmitting power and achieves better performance than other schemes.