Contents I. Introduction
Sixth-generation (6G) networks require massive connectivity and high spectral efficiency. Recently, NOMA gained much attention due to its ability to facilitate massive connectivity and enhance spectral and energy efficiency [1]. Using power domain multiplexing, NOMA allocates less power to the strong user and more power to the weak user therefore, it improves spectrum efficiency by enabling users to share orthogonal resource blocks [2]. However, have some challenges, as similar channel conditions can severely harm the NOMA system’s performance. On the receiver side, SIC is used. When there are fewer users, the complexity of SIC is reduced. However, with multiple users, the SIC complexity increases and negatively impacts the overall performance of this radio access technique [3], [4].
