Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Physical Layer Security Techniques for Future Wireless Networks   The broadcast nature of wireless communication systems makes wireless
transmission extremely susceptible to eavesdropping and even malicious
interference. Physical layer security technology can effectively protect the
private information sent by the transmitter from being listened to by illegal
eavesdroppers, thus ensuring the privacy and security of communication between
the transmitter and legitimate users. The development of mobile communication
presents new challenges to physical layer security research. This paper
provides a comprehensive survey of the physical layer security research on
various promising mobile technologies, including directional modulation (DM),
spatial modulation (SM), covert communication, intelligent reflecting surface
(IRS)-aided communication, and so on. Finally, future trends and the unresolved
technical challenges are summarized in physical layer security for mobile
communications.

26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
19
The categories of this paper are: eess
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org