Due to the broadcast nature of wireless medium, wireless communication ishighly vulnerable to eavesdropping attack. Traditionally, secure wireless datatransmission has relied on cryptographic techniques at the network layer whichincur high computational power and complexity. As an alternative, physicallayer security (PLS) is emerging as a promising paradigm to protect wirelesssystems by exploiting the physical characteristics of the wireless channels.Among various PLS approaches, the one based on cooperative communication isfavorable and has got a lot of interest from the research community. AlthoughPLS schemes with half-duplex relays have been extensively discovered, the issueof PLS in cooperative systems with full-duplex (FD) relays is far from beingcomprehensively understood. In this paper, we first present the state of theart on PLS approaches proposed for FD cooperative systems. We then provide acase study in which a source-based jamming scheme is proposed to enhance thesecrecy performance of a cooperative system with an untrusted FD relay.Finally, we outline several interesting yet challenging future researchproblems in this topic.
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