Jia Zhu

TL;DR: The security requirements of wireless networks, including their authenticity, confidentiality, integrity, and availability issues, and the state of the art in physical-layer security, which is an emerging technique of securing the open communications environment against eavesdropping attacks at the physical layer are discussed.

TL;DR: In this article, a comprehensive overview of security attacks encountered in wireless networks is presented in view of the network protocol architecture, where the potential security threats are discussed at each protocol layer.

TL;DR: The generalized diversity gain is derived and it is shown that, with a guaranteed primary outage probability, the full diversity order is achieved using the proposed adaptive cooperation scheme.

TL;DR: It is shown that as the number of relays increases, both the secrecy capacity and intercept probability of cooperative relay transmission improve significantly, implying there is an advantage in exploiting cooperative diversity to improve physical-layer security against eavesdropping attacks.

TL;DR: It is illustrated that the physical- layer secrecy of CR communications relying on opportunistic relaying can be significantly improved by increasing the number of relays, showing the security benefit of exploiting relay nodes.