Wireless Physical Layer Security with Imperfect Channel State Information: A Survey

• 作 者: Biao He Xiangyun Zhou Thushara D.Abhayapala
• 机 构: Research School of Engineering, the Australian National University,
• 出 处: ZTE Communications
• 发表日期: 2013年03期
• 关键词: physical layer security fading channels channel uncertainty imperfect channel st

Physical layer security is an emerging technique for improving wireless communication security, which is widely regarded as a complement to cryptographic technologies. To design physical layer security techniques for practical scenarios,uncertainty and imperfections in the channel knowledge need to be taken into account. This paper is a survey of recent research on physical layer security that considers imperfect channel state information(CSI) at communication nodes.We first give an overview of the main information-theoretic measures of secrecy performance with imperfect CSI. Then,we describe several signal processing enhancements in secure transmission designs. These enhancements include secure on-off transmission, beamforming with artificial noise, and secure communication assisted by relay nodes or in cognitive radio systems. Recent studies of physical layer security in large-scale decentralized wireless networks are also summarized. Finally, open problems for on-going and future research are discussed.

Physical layer security is an emerging technique for improving wireless communication security, which is vast ideal as a complement to cryptographic technologies. To design physical layer security techniques for practical scenarios, uncertainty and imperfections in the channel knowledge need to be taken into account. This paper is a survey of recent research on physical layer security that considers imperfect channel state information (CSI) at communication nodes. We first give an overview of the main information-theoretic measures of secrecy performance with imperfect CSI. Then, we describe several signal processing enhancements in secure transmission designs. These enhancements include secure on-off transmission, beamforming with artificial noise, and secure communication assisted by relay nodes or in cognitive radio systems. Recent studies of physical layer security in large-scale decentralized wireless networks are also summarized. Finally open problems for on-going and future re search are discussed.