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Two of the most challenging goals to be achieved in the fifth generation (5G)and beyond communication are massive connectivity and higher capacity. The useof traditional orthogonal multiple access techniques limits the number of usersthat can be served using the available resources due to orthogonalityconstraint. Moreover, the available resources may not be utilized effectivelyby the alloted users thereby resulting in inefficiency and user unfairness.This imposes a severe drawback in cases where the number of users to be servedare high, like in the 5G networks. Hence, introducing non-orthogonality to themultiple access scheme is advocated as a supreme methodology to serve multipleusers simultaneously, thereby enhancing the connectivity. In scenarios withmassive number of users, non-orthogonal multiple access scheme increases thenumber of active connections by superimposing the signal of multi-users on asame resource block, thereby also utilizing the available resourcesefficiently.

Non-orthogonal Multiple Access as an Enabler for Massive Connectivity for 5G and Beyond Networks