Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Intelligent Reflecting Surface Aided Secure UAV Communications   In this letter, we study the secure communication problem in the unmanned
aerial vehicle (UAV) enabled networks aided by an intelligent reflecting
surface (IRS) from the physical-layer security perspective.
  Specifically, the IRS is deployed to assist the wireless transmission from
the UAV to the ground user in the presence of an eavesdropper.
  The objective of this work is to maximize the secrecy rate by jointly
optimizing the phase shifts at the IRS as well as the transmit power and
location of the UAV.
  However, the formulated problem is difficult to solve directly due to the
non-linear and non-convex objective function and constraints.
  By invoking fractional programming and successive convex approximation
techniques, the original problem is decomposed into three subproblems, which
are then transformed into convex ones. Next, a low-complexity alternating
algorithm is proposed to solve the challenging non-convex problem effectively,
where the closed-form expressions for transmit power and phase shifts are
obtained at each iteration.
  Simulations results demonstrate that the designed algorithm for IRS-aided UAV
communications can achieve higher secrecy rate than benchmarks.

16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph