Date Added: Nov 2012
In order to conserve energy and achieve better Quality of Service (QoS) provisioning, this paper proposes a Novel Security-Oriented Cooperative (NSOC) scheme for distributed wireless relay networks in presence of eavesdroppers. The authors' scheme includes two parts. In part one, they model the wireless relay network and analyze the secure connectivity by exploiting the secrecy graph. Then, when the result of the analysis is inferior to the security demands, their developed cooperative jamming strategy is kicked in to further assist the secure communications, which plays the important role in secure communications. In the cooperative jamming strategy, the channels established by candidate nodes are modeled as Finite-State Markov Channels (FSMCs) owing to the property of time-varying, and the remaining energy of nodes is considered as well.