User Pairing and Power Allocation for Capacity Maximization in Uplink NOMA

This paper focuses on user pairing (UP) and power allocation (PA) by considering an uplink Non-orthogonal multiple access (NOMA) system. In NOMA, UP and PA serve as critical factors to achieve high performance gains. In this context, channel gains of paired users and their PA factors are varied to comprehensively analyze the dynamics of UP and PA in the context of individual and sum capacity of paired users. On the basis of this analysis, a look-up table is provided, which shows that efficient UP and PA can maximize the sum capacity of an uplink NOMA system, while satisfying the individual target rates of the paired users. Moreover, a mechanism to choose the best user pair and corresponding PA by using such tables is also discussed for swift UP and PA.

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