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In cooperative wireless networks, relay nodes are used to improve the channel capacity of the system. However, the presence of malicious relays in the network may severely degrade the performance of the system. More specifically, there exists a possibility that a node refuses to cooperate when it is selected for cooperation or deliberately drop the received packets. Trust establishment is a mechanism to detect misbehaving nodes in a network. In this paper, the authors propose a trust establishment method for cooperative wireless networks using Bayesian framework. In contrast with previous schemes, this approach takes the channel state information and relay selection policy into account to derive a pure trust value for each relay node.
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