Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: IRS-based Wireless Jamming Attacks: When Jammers can Attack without
  Power   This paper proposes to use Intelligent Reflecting Surface (IRS) as a green
jammer to attack a legitimate communication without using any internal energy
to generate jamming signals. In particular, the IRS is used to intelligently
reflect the signals from the legitimate transmitter to the legitimate receiver
(LR) to guarantee that the received signals from direct and reflecting links
can be added destructively, which thus diminishes the
Signal-to-Interference-plus-Noise Ratio (SINR) at the LR. To minimize the
received signal power at the LR, we consider the joint optimization of
magnitudes of reflection coefficients and discrete phase shifts at the IRS.
Based on the block coordinate descent, semidefinite relaxation, and Gaussian
randomization techniques, the solution can be obtained efficiently. Through
simulation results, we show that by using the IRS-based jammer, we can reduce
the signal power received at the LR by up to 99\%. Interestingly, the
performance of the proposed IRS-based jammer is even better than that of the
conventional active jamming attacks in some scenarios.

14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph