Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Aerial Intelligent Reflecting Surface Enabled Terahertz Covert
  Communications in Beyond-5G Internet of Things   Unmanned aerial vehicles (UAVs) are envisioned to be extensively employed for
assisting wireless communications in Internet of Things (IoT) applications. On
the other hand, terahertz (THz) enabled intelligent reflecting surface (IRS) is
expected to be one of the core enabling technologies for forthcoming beyond-5G
wireless communications that promise a broad range of data-demand applications.
In this paper, we propose a UAV-mounted IRS (UIRS) communication system over
THz bands for confidential data dissemination from an access point (AP) towards
multiple ground user equipments (UEs) in IoT networks. Specifically, the AP
intends to send data to the scheduled UE, while unscheduled UEs may pose
potential adversaries. To protect information messages and the privacy of the
scheduled UE, we aim to devise an energy-efficient multi-UAV covert
communication scheme, where the UIRS is for reliable data transmissions, and an
extra UAV is utilized as a cooperative jammer generating artificial noise (AN)
to degrade unscheduled UEs detection. We then formulate a novel minimum average
energy efficiency (mAEE) optimization problem, targetting to improve the covert
throughput and reduce UAVs' propulsion energy consumption subject to the
covertness requirement, which is determined analytically. Since the
optimization problem is non-convex, we tackle it via the block successive
convex approximation (BSCA) approach to iteratively solve a sequence of
approximated convex sub-problems, designing the binary user scheduling, AP's
power allocation, maximum AN jamming power, IRS beamforming, and both UAVs'
trajectory planning. Finally, we present a low-complex overall algorithm for
system performance enhancement with complexity and convergence analysis.
Numerical results are provided to verify our analysis and demonstrate
significant outperformance of our design over other existing benchmark schemes.

14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat