Design of Physical Layer Secure Transmission Scheme Based on SWIPT NOMA Systems

this paper mainly studies the physical layer security problem in the non-orthogonal multiple access (NOMA) system of simultaneous wireless information and power transfer (SWIFT) in the downlink channel. There may be eavesdroppers in the cooperation between SWIFT and NOMA, so the security of transmission rate is not guaranteed. We propose a system of SWIFT and NOMA to transmit the physical layer security scheme to attack the eavesdropper. In the QoS of the legitimate users who guarantee the "weak channel", the "strongest channel" Legal user's security rate. In order to improve the confidentiality of the signals transmitted by the base station, this paper solves the problem of maximizing the security rate by SDR and particle swarm optimization.