Ph.D. Dissertation Defense - Keerthi Arumugam

Event Details

Tuesday, March 26, 2019

11:00am - 1:00pm

Room 523A, TSRB

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Event Details

TitleCovert Communication Over Multi-user Channels


Dr. Matthieu Bloch, ECE, Chair , Advisor

Dr. John Barry, ECE

Dr. Mary Ann Weitnauer, ECE

Dr. Mark Davenport, ECE

Dr. Sebastian Pokutta, ISyE


The 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. 

Last revised March 14, 2019