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Non-orthogonal multiple-access (NOMA) and simultaneous wireless informationand power transfer (SWIPT) are promising techniques to improve spectralefficiency and energy efficiency. However, the security of NOMA SWIPT systemshas not received much attention in the literature. In this paper, an artificialnoise-aided beamforming design problem is studied to enhance the security of amultiple-input single-output NOMA SWIPT system where a practical non-linearenergy harvesting model is adopted. The problem is non-convex and challengingto solve. Two algorithms are proposed to tackle this problem based onsemidefinite relaxation (SDR) and successive convex approximation. Simulationresults show that a performance gain can be obtained by using NOMA compared tothe conventional orthogonal multiple access. It is also shown that theperformance of the algorithm using a cost function is better than the algorithmusing SDR at the cost of a higher computation complexity.

Enhancing PHY Security of MISO NOMA SWIPT Systems With a Practical Non-Linear EH Model