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Cooperative transmission is an emerging wireless communication technique that improves wireless channel capacity through multi-user cooperation in the physical layer. It is expected to have a profound impact on network performance and design. However, cooperative transmission can be vulnerable to selfish behaviors and malicious attacks, especially in its current design. In this paper, the authors investigate two fundamental questions: Does cooperative transmission provide new opportunities to malicious parties to undermine the network performance? Are there new ways to defend wireless networks through physical layer cooperation? Particularly, they study the security vulnerabilities of the traditional cooperative transmission schemes, and show the performance degradation resulting from the misbehaviors of relay nodes.
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