Wireless communications using NOMA

Abstract

This dissertation explores the implementation and performance of Non-Orthogonal Multiple Access (NOMA) in the context of wireless communication, particularly focusing on its integration with the fifth-generation (5G) New Radio (NR). As a key multiple-access technique, NOMA provides enhanced spectral efficiency, massive connectivity, and reduced latency compared to traditional Orthogonal Multiple Access (OMA) methods. This report provides an overview of NOMA's fundamental principles, including superposition coding and successive interference cancellation. It discusses various solutions for NOMA integration in 5G NR, such as Cooperative NOMA, user pairing, and power allocation. Simulations were conducted to evaluate the performance of NOMA compared to OMA, both in downlink and uplink scenarios, along with Multiple Input Multiple Output (MIMO)-NOMA implementations. The results show that NOMA provides superior capacity, user fairness, and system-level efficiency, making it a promising multiple-access scheme for future wireless networks.