Abstract:Aiming at the multi-user wireless eavesdropping scenario with limited energy in relay node, a security transmission scheme is proposed based on the cooperative non-orthogonal multiple access (NOMA) technology and the simultaneous wireless information and power transfer (SWIPT) technology. In this scheme, the transmit antenna selection mechanism is carried out in the multi-antenna base station. Firstly, the full-duplex cooperative relay technology is utilized for improving transmission reliability and spectrum utilization in NOMA system, and the SWIPT technology is utilized for overcoming the energy shortage problem caused by excessive power consumption of the relay node. Furthermore, the closed-form expressions of outage probability and secrecy outage probability are derived for further measuring the system performance. Finally, the effect of key system parameters on system performance is comprehensively analyzed through asymptotic analysis. Numerical results show that the system performance can be improved by reasonably setting the power allocation coefficient of NOMA user and the power splitting ratio of SWIPT user. Compared with the cooperative NOMA and the traditional NOMA transmission mechanism, the proposed scheme has improved the security performance by 33% and 59%, respectively. Keywords: simultaneous wireless information and power transfer (SWIPT);