Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Artificial Noise Injection for Securing Single-Antenna Systems   We propose a novel artificial noise (AN) injection scheme for wireless
systems over quasi-static fading channels, in which a single-antenna
transmitter sends confidential messages to a half-duplex receiver in the
presence of an eavesdropper. Different from classical AN injection schemes,
which rely on a multi-antenna transmitter or external helpers, our proposed
scheme is applicable to the scenario where the legitimate transceivers are very
simple. We analyze the performance of the proposed scheme and optimize the
design of the transmission. Our results highlight that perfect secrecy is
always achievable by properly designing the AN injection scheme.

18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th