Topic：Connectivity of Multi-Channel Wireless Networks under Jamming Attacks

Time：2014年5月13日（周二）上午10:00-11:30

Venue：信电大楼-215学术厅

Speaker：Huaiyu Dai, Associated Professor

                  Electrical and Computer Engineering

                   North Carolina State University ,USA

Biography

Huaiyu Dai (M’03, SM’09) received the B.E. and M.S. degrees in electrical engineering from Tsinghua University, Beijing, China, in 1996 and 1998, respectively, and the Ph.D. degree in electrical engineering from Princeton University, Princeton, NJ in 2002. He was with Bell Labs, Lucent Technologies, Holmdel, NJ, during summer 2000, and with AT&T Labs-Research, Middletown, NJ, during summer 2001. Currently he is an Associate Professor of Electrical and Computer Engineering at NC State University, Raleigh. His research interests are in the general areas of communication systems and networks, advanced signal processing for digital communications, and communication theory and information theory. His current research focuses on networked information processing and crosslayer design in wireless networks, cognitive radio networks, wireless security, and associated information-theoretic and computation-theoretic analysis. He has served as an editor of IEEE Transactions on Communications, Signal Processing, and Wireless Communications. He co-edited two special issues of EURASIP journals on distributed signal processing techniques for wireless sensor networks, and on multiuser information theory and related applications, respectively. He co-chairs the Signal Processing for Communications Symposium of IEEE Globecom 2013, the Communications Theory Symposium of IEEE ICC 2014, and the Wireless Communications Symposium of IEEE Globecom 2014.

Abstract

Jamming attacks can cause serious destruction to communication systems without much cost, especially when secret keys shared by the system are exposed. Uncoordinated Frequency Hopping (UFH) is an effective countermeasure to jamming attacks without dependence on pre-shared secret keys. In this paper we study the connectivity of a multi-channel network under jamming attacks, where each communication link can switch from regular transmission to UFH transmission when jamming attacks are detected. Under the framework of percolation theory, we show that as the jammer density increases, two phase transitions occur: from strong connection where there exists an infinite component composed of regular links, to weak connection where there exists an infinite component composed of both regular and UFH links, then to disconnection.