A Comprehensive Review on NOMA Assisted Emerging Techniques in 5G and Beyond 5G Wireless Systems.

A promising technique for increasing the number of users in a wireless network is Non-Orthogonal Multiple Access (NOMA) which improves the spectral efficiency and unfairness in communication by using same wireless resource to more than one user. The wireless technologies such as millimeter wave communication, physical layer security, grant free communication, massive Multiple Input Multiple Output communication, and visible light communication are combined with NOMA flexibly to increase energy efficiency, scalability, and spectral efficiency to enhance the performance of future wireless communication network. In this paper, we provide a comprehensive review and detailed description on combination of NOMA with existing 5G and beyond 5G wireless techniques. The benefits of these techniques when combined with NOMA are described to identify the supremacy of the NOMA with 5G wireless systems. Moreover, we also describe the existing challenges faced during combination of NOMA with 5G and beyond 5G and future research directions are also identified. [ABSTRACT FROM AUTHOR]