Thursday, August 27 2015,
15h00-17h00

Title: Energy Efficient Spectrum Sensing in Large Scale Cognitive Radio Networks

Speaker: Ahmed E. Kamal

Department of Electrical and Computer Engineering
Iowa State University
Ames, IA, USA

Room: A04.01, TSP 9 rue Charles Fourier 91011 Evry CEDEX

Abstract:

Due to the increase in bandwidth demand of mobile users and their devices with energy hungry wireless networking modules, recent research has focused on the paradox of finding more spectrum to use while consuming less energy. This talk considers cognitive radio networks (CRNs) in which unlicensed secondary users (SUs) try to find available spectrum, which is the spectrum licensed to primary users (PUs) but is not being used. This is done by sensing PUs’ channels to detect their status. Usually, cooperative spectrum sensing is used to increase the confidence about the decision of the PUs’ channels status. We also consider large scale CRNs with many PU channels, and the SUs need to decide on which channels to sense, and in which order. In order to maximize the discovered spectrum, while minimizing energy consumed in sensing, switching between channels, and reporting sensing measurements, we introduce a cooperative sensing scheduling framework to minimize the opportunity cost, which is defined as the consumed energy per discovered unit of free spectrum. This scheme not only provides a feasible network set up in large scale CRNs in which there does not exist a sufficient number of SUs to satisfy the PU protection in a single round, but also offers a reduction in the opportunity cost. Because of the combinatorial nature of this problem, a heuristic method is also developed to reduce the time complexity while achieving results very close to the optimal cost.

Ahmed E. Kamal Biography:

Ahmed E. Kamal is a professor of Electrical and Computer Engineering at Iowa State University in the USA. He received a B.Sc. (distinction with honors) and an M.Sc. both from Cairo University, Egypt, and an M.A.Sc. and a Ph.D. both from the University of Toronto, Canada, all in Electrical Engineering. He is a Fellow of the IEEE and a senior member of the Association of Computing Machinery. He was an IEEE Communications Society Distinguished Lecturer for 2013 and 2014.

Kamal’s research interests include cognitive radio networks, wireless networks, optical networks, and performance evaluation. He received the 1993 IEE Hartree Premium for papers published in Computers and Control in IEE Proceedings, and the best paper award of the IEEE Globecom 2008 Symposium on Ad Hoc and Sensors Networks Symposium.

Kamal is the chair of the IEEE Communications Society Technical Committee on Transmission, Access and Optical Systems (TAOS). He also chaired or co-chaired Technical Program Committees of several IEEE sponsored conferences including the Optical Networks and Systems Symposia of the IEEE Globecom 2007 and 2010, the Cognitive Radio and Networks Symposia of the IEEE Globecom 2012 and 2014, and the Access Systems and Networks track of the IEEE International Conference on Communications 2016. He is on the editorial boards of the IEEE Communications Surveys and Tutorials, the Computer Networks journal, and the Optical Switching and Networking journal.