Reliability and Security Analysis of Energy Harvesting-Based Partial Non-Orthogonal Multiple Access Systems

This paper presents an analytical study on wireless systems employing partial Non-Orthogonal Multiple Access (PNOMA) combining energy harvesting technique. In the proposed system, which includes one information source, two destinations, one power beacon, and one eavesdropper, we conduct an analysis of reliability and security. We derive closed-form and asymptotic expressions for outage probability (OP), intercept probability (IP) for the system. In addition, the ergodic and security capacities for the system's two secure schemes, i.e., full transmission information (FTI) and partial transmission information (PTI), where the eavesdropper is aware of the bandwidth region for signal transmission, are also calculated for evaluation. The results indicate that the bandwidth division ratio must be meticulously selected based on the beacon's transmit power to ensure the superior performance, i.e., both reliability and security, of the PNOMA scheme over the NOMA scheme. Moreover, the findings demonstrate that employing PNOMA enhances the outage performance of the near destination, while the far destination retains the same level of performance as observed with the NOMA scheme. Additionally, the performance of the PNOMA scheme is superior to that of the Orthogonal Multiple Access scheme in terms of OP. For security aspect, the performance of the destination in the PTI scheme is the best in terms of IP. Specifically, the system performance benefits from the PNOMA scheme when the beacon transmits at lower power levels.