Physical Layer Security for 5G Wireless Networks: A Comprehensive Survey

Physical-layer security is emerging approach that
can benefit conventional encryption methods. The main idea of
physical layer security is to take advantage of the features of
the wireless channel and its impairments in order to ensure
secure communication in the physical layer. This paper provides
a comprehensive review of information-theoretic measures of
the secrecy performance in physical layer security. In addition,
our work survey research about physical layer security over
several enabling 5G technologies, such as massive multiple-input
multiple-output, millimeter wave communications, heterogeneous
networks, and full-duplex, including the key concepts of each
of the aforementioned technologies. Finally, future research
directions and technical challenges of physical layer security are
identified.