Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Downlink Non-Orthogonal Multiple Access (NOMA) in Poisson Networks   A network model is considered where Poisson distributed base stations
transmit to $N$ power-domain non-orthogonal multiple access (NOMA) users (UEs)
each {that employ successive interference cancellation (SIC) for decoding}. We
propose three models for the clustering of NOMA UEs and consider two different
ordering techniques for the NOMA UEs: mean signal power-based and instantaneous
signal-to-intercell-interference-and-noise-ratio-based. For each technique, we
present a signal-to-interference-and-noise ratio analysis for the coverage of
the typical UE. We plot the rate region for the two-user case and show that
neither ordering technique is consistently superior to the other. We propose
two efficient algorithms for finding a feasible resource allocation that
maximize the cell sum rate $\mathcal{R}_{\rm tot}$, for general $N$,
constrained to: 1) a minimum throughput $\mathcal{T}$ for each UE, 2) identical
throughput for all UEs. We show the existence of: 1) an optimum $N$ that
maximizes the constrained $\mathcal{R}_{\rm tot}$ given a set of network
parameters, 2) a critical SIC level necessary for NOMA to outperform orthogonal
multiple access. The results highlight the importance in choosing the network
parameters $N$, the constraints, and the ordering technique to balance the
$\mathcal{R}_{\rm tot}$ and fairness requirements. We also show that
interference-aware UE clustering can significantly improve performance.

12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
16
The categories of this paper are: stat
3
The categories of this paper are: physics
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ