Uplink NOMA Analysis with different Allocation Algorithms over $F$ Fading Channels

In this work, we investigate uplink non-orthogonal multiple access (NOMA) performance in which divide-next-largest-difference-based user pairing algorithm (D-NLUPA) is employed. Communication is performed among base station (BS) and paired users in arbitrary number of clusters. The channels are described by Fischer-Snedecor
$(\boldsymbol{F})$
fading model. The outage probability and sum data rate are defined for power-domain NOMA using data rate-based power allocation procedure. Comparison of two pairing schemes, D-NLUPA and High-Low, is done in terms of aforementioned metrics. Numerical results also show the influence of fading depth and shadowing sharpness; user locations, and the number of users in the cell.