Journal
IEEE COMMUNICATIONS SURVEYS AND TUTORIALS
Volume 19, Issue 2, Pages 1027-1053Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/COMST.2016.2633387
Keywords
Physical layer security; multiple-antenna technique; secrecy performance; beamforming design
Funding
- Natural Science Foundation of China [61301102]
- Australian Research Council's Discovery Early Career Researcher Award (DECRA) [DE170100137]
- National Science Council of Taiwan [NSC102-2221-E-006-008-MY3]
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As a complement to high-layer encryption techniques, physical layer security has been widely recognized as a promising way to enhance wireless security by exploiting the characteristics of wireless channels, including fading, noise, and interference. In order to enhance the received signal power at legitimate receivers and impair the received signal quality at eavesdroppers simultaneously, multiple-antenna techniques have been proposed for physical layer security to improve secrecy performance via exploiting spatial degrees of freedom. This paper provides a comprehensive survey on various multiple-antenna techniques in physical layer security, with an emphasis on transmit beamforming designs for multiple-antenna nodes. Specifically, we provide a detailed investigation on multiple-antenna techniques for guaranteeing secure communications in point-to-point systems, dual-hop relaying systems, multiuser systems, and heterogeneous networks. Finally, future research directions and challenges are identified.
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