Jamming Strategies for Physical Layer Security

This article provides a comprehensive overview on jamming strategies in the physical layer for securing wireless communications. As a complement to traditional cryptography-based approaches, physical layer based security provisioning techniques offer a number of promising features that have not been previously available. Among the physical layer security techniques, jamming is an effective way to degrade the channel quality of the eavesdroppers for ensuring security. We start by giving a brief introduction to the fundamental principles of physical layer security and jamming. Then we classify jamming strategies from three different perspectives and explain the major related designs in various scenarios. Finally, we discuss the open issues of jamming that can be helpful to foster future research.