Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-Orthogonal Multiple Access for mmWave Drones with Multi-Antenna
  Transmission   Unmanned aerial vehicles (UAVs) can be deployed as aerial base stations (BSs)
for rapid establishment of communication networks during temporary events and
after disasters. Since UAV-BSs are low power nodes, achieving high spectral and
energy efficiency are of paramount importance. In this paper, we introduce
non-orthogonal multiple access (NOMA) transmission for millimeter-wave (mmWave)
drones serving as flying BSs at a large stadium potentially with several
hundreds or thousands of mobile users. In particular, we make use of
multi-antenna techniques specifically taking into consideration the physical
constraints of the antenna array, to generate directional beams. Multiple users
are then served within the same beam employing NOMA transmission. If the UAV
beam can not cover entire region where users are distributed, we introduce beam
scanning to maximize outage sum rates. The simulation results reveal that, with
NOMA transmission the spectral efficiency of the UAV based communication can be
greatly enhanced compared to orthogonal multiple access (OMA) transmission.
Further, the analysis shows that there is an optimum transmit power value for
NOMA beyond which outage sum rates do not improve further.

8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph