Performance Analysis of Uplink Non-orthogonal Multiple Access (NOMA)

Nowadays wireless communication systems use orthogonal access technologies. FDMA, TDMA and CDMA technologies that have proven themselves in cellular communication systems have been replaced by OFDMA multiple access technology. OFDMA technology is used in LTE networks and in many other standards of wireless communication systems. A modified version of OFDMA technology is also used in the new 5G new radio networks. For future 6G and beyond wireless communication systems, a new technological platform is needed to provide communication services not only to people, but also to maintain the concept of the Internet of everything. The primary problem is the increased network capacity requirements. A promising technology is NOMA non-orthogonal access technology, which is a candidate technology for inclusion in future standards of wireless communication systems. There are many varieties of NOMA technology. The main goal of this work is to investigate the potential capabilities of NOMA systems with power domain - PD-NOMA. The paper presents the results of simulation modeling to evaluate the performance of PD-NOMA systems in the uplink, which is a particularly interesting scenario for Internet of Things systems.