Performance Research of SWIPT-NOMA cooperative network based on PRS

In this paper, we consider a model of a NOMA cooperative network based on SWIPT aiming at the problem of energy-constrained and eavesdropping information transmission security in a downlink multirelay NOMA cooperative network. First, a partial relay selection strategy based on the minimum gain of the eavesdropping channel and a partial relay selection strategy based on maximum energy harvesting are proposed. We derive exact expressions of the interruption probability of users and interception probability of eavesdroppers. Then, the impact of the relay number, energy conversion efficiency, power splitting factor and distance factor on the system interruption performance and information security is analyzed. Finally, the results show that the interruption performance and information security reliability of the partial relay selection strategy based on the minimum gain of the eavesdropping channel are superior to those of the strategy based on maximum energy harvesting.