On Performance of SWIPT Empowered NOMA-HetNet with Non-Linear Energy Harvesting.

This work studies the performance of energy harvesting (EH) assisted cooperative non-orthogonal multiple access (NOMA) in a two-tier heterogeneous network (HetNet) with a realistic nonlinear EH model. The paper proposes an analytical methodology for improving the performance of NOMA user with poor channel conditions by employing EH and cooperative NOMA at the user with good channel conditions. The analysis is considered at the NOMA pair served by the small base station (SBS). Cooperation is carried out by one of the users in a NOMA pair which acts as decode and forward relay node assisted with EH. The outage probability at the NOMA users is derived in closed form using stochastic geometry. The performance of the proposed system is compared with the system without EH and the system with linear EH. It is shown that the proposed system attains higher throughput than orthogonal multiple access (OMA) without EH in the considered scenario.