Secured NOMA Full-Duplex Transmission With Energy Harvesting

Nonorthogonal multiple access (NOMA) enhances spectral efficiency by enabling manifold devices to utilize the same frequency-time resource through nonorthogonal signal superposition. In addition, full-duplex (FD) transmission allows concurrent reception and transmission on the same frequency range, further improving spectral efficiency. Moreover, nearby wireless energy sources are utilized to enhance energy efficiency. Nonetheless, several challenges are inherent in NOMA FD transmission with energy harvesting (NOFE), including information security concerns and practical imperfections such as channel state information imperfection (CSIi), hardware impairment (HWi), and successive interference cancellation imperfection (SICi). The paper first proposes a solution to address these challenges by leveraging an energy source both as an energy supplier and a jammer to secure transmission under imperfections. The performance of the proposed solution is then evaluated using three key metrics (total throughput, outage probability, energy efficiency). The study highlights the significant impact of various factors such as energy harvesting, HWi, CSIi, NOMA, SICi, and FD on the performance metrics. The proposed solution also aims to prevent complete outage by optimizing required spectral efficiency, HWi, CSIi, SICi and power splitting parameter. Additionally, optimal configuration of system parameters is crucial for achieving optimum performance metrics. Furthermore, the proposed NOFE is demonstrated to be more secured than two benchmark techniques (orthogonal multiple access FD transmission and NOMA half-duplex transmission) across numerous parameter configurations, emphasizing the superiority of utilizing concurrently both NOMA and FD to only either NOMA or FD.