|Title||:||Interference Management Through Exclusion Zones in Two-Tier Cognitive Networks|
|Speaker||:||TJ Lim (National University of Singapore)|
|Details||:||Mon, 9 Nov, 2015 3:00 PM @ BSB 361|
|Abstract:||:||Considering a two-tier network consisting of a licensed primary network overlaid by an unlicensed secondary tier, this paper proposes CR-based spectrum access schemes for secondary users (SUs). Acquiring the activity information of nearby users, the SUs are activated only when they are outside the exclusion zone of primary receivers. Additionally, the active secondary transmitters are separated from each other by forming secondary exclusion zones around themselves. Using stochastic geometry, primary and secondary exclusion zone sizes that maximize the transmission capacity under per-tier outage constraints are calculated. Analytical results supported by numerical simulations, suggest primary exclusion zones reduce predominantly the cross-tier interference while the secondary exclusion zone size is critical in mitigating the interference among SUs.
Biography: Teng Joon (T. J.) Lim grew up in Singapore, obtained the B.Eng. degree in Electrical Engineering with first-class honours from the National University of Singapore in 1992, and the Ph.D. degree from the University of Cambridge in 1996. From September 1995 to November 2000, he was a researcher at the Centre for Wireless Communications in Singapore, one of the predecessors of the Institute for Infocomm Research (I2R). From December 2000 to May 2011, he was Assistant Professor, Associate Professor, then Professor at the University of Toronto’s Edward S. Rogers Sr. Department of Electrical and Computer Engineering. Since June 2011, he has been a Professor at the National University of Singapore’s Electrical & Computer Engineering Department, where he served as the Deputy Head (Research and Graduate Programs) from July 2014 to August 2015. He currently serves as Vice-Dean (Graduate Programmes) in the Faculty of Engineering.
Professor Lim is an Area Editor (in the Wireless Communications Theory and Systems I area) of the IEEE Transactions on Wireless Communications, and previously served as an Associate Editor for the same journal. He is serving as an Associate Editor for IEEE Wireless Communications Letters, and an Executive Editor for Wiley Transactions on Emerging Telecommunications Technologies (ETT). Previously he was an Associate Editor for IEEE Signal Processing Letters and for IEEE Transactions on Vehicular Technology. He has also co-chaired a number of IEEE conferences, and is a regular TPC member at major international conferences.
His research interests span many topics within wireless communications, including the Internet of Things, heterogeneous networks, cooperative transmission, energy-optimized communication networks, multi-carrier modulation, MIMO, cooperative diversity, cognitive radio, and stochastic geometry for wireless networks, and he has published widely in these areas.