Performance Analysis of a NOMA-Based Multi-User IoT Network with SWIPT Protocol

This study investigates the performance of user equipments (UEs) and Internet of Things (IoT) devices in a multi-user (MU) multiple-input single-output (MISO) configuration based non-orthogonal multiple-access (NOMA) system. The proposed model includes a base station surrounded by many users and a number of dispersed IoT devices. In the considered MU IoT network scenario, power allocation coefficients are set to ensure that both the relaying UE and the targeted IoT device experience increased performance. To assist the intended IoT device with weak channel conditions, an optimal user selection method is developed that picks a UE with comparatively better reception, and thereby the selected UE acts as a relay forward node utilizing the simultaneous wireless information and power transfer protocol. The characterization of a key performance metric, i.e., the outage probability is derived by adopting a two-step procedure. First, quadratic forms of signal-to-interference-plus-noise ratio (SINR) at the relaying UE and the signal-to-noise ratio (SNR) and SINR at the intended IoT device are constructed. Then, using the indefinite quadratic form approach, we arrive at closed-form expressions for the outage probability (OP) of the intended IoT device under linearly dependent beamformers. To validate the analytical expressions provided in this study, simulations are performed.

کلیدواژه ها:

MU-MISO-NOMA ، User selection ، Energy harvesting ، SWIPT ، Beamformers