Abstract

The prime challenge faced by the 5th Generation (5G) wireless communication is the greater spectral efficiency (3 times over 4G) and massive connectivity (is one million connections per square kilometre). These fulfilments are very difficult to be satisfied with conventional orthogonal Multiple Access (MA) schemes. Non-Orthogonal Multiple Access (NOMA) is one of the most promising MA scheme for performance enhancement in 5G wireless communications. NOMA serves multiple users at the same frequency/ time/ code domain with different power levels, which is the cornerstone feature of it. Compared to conventional orthogonal MA schemes, NOMA yields a desirable benefit like higher spectral efficiency, fairness and so on. This paper deals with a survey of NOMA along with potentials and research challenges.

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