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dc.contributor.authorArumugam, Keerthi Suria Kumar
dc.date.accessioned2019-05-29T14:03:11Z
dc.date.available2019-05-29T14:03:11Z
dc.date.created2019-05
dc.date.issued2019-03-27
dc.date.submittedMay 2019
dc.identifier.urihttp://hdl.handle.net/1853/61256
dc.description.abstractThe objective of the proposed research is to characterize the maximum rate at which information can be transmitted reliably to a legitimate receiver over certain multi-user channels while simultaneously escaping detection from one or more adversaries. Specifically, we investigate the fundamental limits of covert communication over the following multi-user channel models — a K-user discrete memoryless multiple-access channel (MAC) monitored by a single warden, a discrete memoryless broadcast channel in which one of the receivers is a warden trying to detect the presence of a covert message, and a relay channel model in which the relay aids covert transmission amidst two non-colluding wardens each monitoring the transmitter and the relay, respectively. In all three models, we observe that the covert throughput is subject to the square-root law. Also, building upon a previous result that codeword-level asynchronism results in an improved covert throughput that circumvents the square-root law, we analyze the impact on the covert throughput as a result of symbol-level asynchronism at the receiver and the warden.
dc.format.mimetypeapplication/pdf
dc.publisherGeorgia Institute of Technology
dc.subjectCovert communication
dc.subjectMulti user
dc.subjectMultiple access channels
dc.subjectBroadcast channels
dc.subjectRelay channels
dc.subjectAsynchronous
dc.titleCovert communication over multi-user channels
dc.typeDissertation
dc.description.degreePh.D.
dc.contributor.departmentElectrical and Computer Engineering
thesis.degree.levelDoctoral
dc.contributor.committeeMemberBloch, Matthieu
dc.contributor.committeeMemberWeitnauer, Mary Ann
dc.contributor.committeeMemberDavenport, Mark
dc.contributor.committeeMemberPokutta, Sebastian
dc.contributor.committeeMemberBarry, John
dc.date.updated2019-05-29T14:03:11Z


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