Cognitive Spectrum Sharing through ARQ

 

Speaker: Dr. Wei Zhang, Senior Lecturer, The University of New South Wales, Sydney, Australia 

Date and Time: 10:30-11:30, Dec. 28th, 2010

Place: Room 415, Building of Computing Centre

Abstract

Cognitive radio is an exciting emerging technology which has the potential of dealing with the stringent requirement and scarcity of the radio spectrum and allowing agile and efficient utilization of the radio spectrum by offering distributed terminals or radio cells the ability of radio sensing, self-adaptation, and dynamic spectrum sharing. In this talk, an opportunistic sharing scheme, referred to as spectrum sharing with ARQ retransmissions and probing (SHARP), is introduced for cognitive radio networks. We consider a pair of cognitive radio users co-existing with a pair of ARQ-based primary users. The cognitive user overhears the ARQ feedback sent from the receiver of the primary system, and then selects an appropriate transmission mode to access the primary channel. The proposed SHARP approach aims to exploit various spectrum sharing opportunities based on the ACK/NACK of primary users only. Analytical achievable throughput is derived and it is demonstrated that the performance of cognitive radio system increases dramatically by employing SHARP.

Biography

Wei Zhang received the Ph.D. degree in Electronic Engineering from The Chinese University of Hong Kong in 2005. He has been with the School of Electrical Engineering and Telecommunications, The University of New South Wales since May 2008, where he is a Senior Lecturer. His current research interests include cognitive radio, cooperative communications, space-time coding, and multiuser MIMO. He received the best paper award at the 50th IEEE Global Communications Conference (GLOBECOM), Washington DC in 2007 and the IEEE Communications Society Asia-Pacific Outstanding Young Researcher Award in 2009. He is Co-chair of International Conference on Communications (ICC 2011) – Communications Theory Symposium. He is an Editor of IEEE TRANACTIONS ON WIRELESS COMMUNICATIONS.

 

E-mail: wzhang@ee.unsw.edu.au
Web: www.ee.unsw.edu.au/~wzhang/