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Inspired by recent results on information-theoretic security, the authors consider the transmission of confidential messages over wireless networks, in which the legitimate communication partners are aided by friendly jammers. They characterize the security level of a confined region in a quasi-static fading environment by computing the probability of secrecy outage in connection with two new measures of physical-layer security: the jamming coverage and the jamming efficiency. Their analysis for various jamming strategies based on different levels of channel state information provides insight into the design of optimal jamming configurations and shows that a single jammer is not sufficient to maximize both figures of merit simultaneously.
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