January 20 - Wednesday  1:30PM -4-206 Center for Science and Technology

Prof. Yingbin Liang

Title:   Towards High Speed, Reliable and Secure Wireless Communications

Speaker:  Yingbin Liang, Assistant Professor     Syracuse University

Abstract: The overarching goal of wireless communication research is to develop techniques to combat channel uncertainties intrinsic to wireless systems, and to provide high speed reliable and secure transmissions for mobile users. Towards this goal, multiple-input multiple-output (MIMO) transmission, cooperative relaying, cognitive radio communications, and information-theoretic security are emerging as powerful techniques for improving the throughput, reliability and security of wireless networks. In this talk, I will first overview the goals for wireless communications and the challenges ahead in exploring the performance advantages provided by the techniques of MIMO transmission, cooperative relaying, cognitive radio, and information theoretic security. Within the context of this overview, I will describe the research projects I have being pursuing, including optimal schemes for noncoherent and MIMO wireless communications, resource allocation for wireless relay channels; impact of user cooperation and relaying on broadcast networks, management in cognitive radio networks, and information theoretic approaches to achieve secure wireless communications.

Bio: Dr. Yingbin Liang received the Ph.D. degree in Electrical Engineering from the University of Illinois at Urbana-Champaign in 2005. In 2005-2007, she worked as a postdoctoral research associate at Princeton University. In 2008-2009, she was an assistant professor at the Department of Electrical Engineering at the University of Hawaii. She joined the Department of Electrical Engineering and Computer Science at Syracuse University in December 2009 as an Assistant Professor.

Dr. Liang was a Vodafone Fellow at the University of Illinois at Urbana-Champaign during 2003-2005, and received the Vodafone-U.S. Foundation Fellows Initiative Research Merit Award in 2005. She also received the M. E. Van Valkenburg Graduate Research Award from the ECE department, University of Illinois at Urbana-Champaign, in 2005. In 2009, she received the National Science Foundation CAREER Award, and the State of Hawaii Governor Innovation Award. Dr. Liang's research interests include communications, wireless networks, and information theory.

February 4 - Wednesday  12:30PM -369 Link Hall

Prof. Mahmoud El Sabbagh

 
Title: Pattern Diversity Using Single Dielectric Resonator Antenna

Speaker: Mahmond El Sabbagh, Professor SyracuseUniversity

Abstract: The demand for increasing channel capacity for wireless communications is increasing. Multiple-input multiple-output (MIMO) wireless technology uses multiple antennas at the transmitter and receiver to produce significant capacity gains over single-input single-output systems using the same bandwidth and transmit power. The primary aim of MIMO antenna design is to reduce correlation between received signals by exploiting various forms of diversity that arise due to the presence of multiple antennas, like space diversity (spacing antennas far apart), pattern diversity (using antennas with different or orthogonal radiation patterns), polarization diversity (using antennas with different polarizations) etc. In this work, it is proposed to use of a single dielectric resonator antenna operating at higher order dual modes to obtain pattern diversity and polarization diversity and having miniaturized dimensions.

To prove and validate the concept, numerical and experimental measurements are carried for the following shapes: cylindrical disc, cylindrical ring, and cubic block. The dielectric resonator antenna is excited using a 50-? coaxial connector mounted on a finite ground plane. The plots of far field total gain at higher order modes confirm the possibility of getting pattern diversity using a single antenna which will reduce the complexity and size of multiple-input multiple-output (MIMO) systems used for wireless applications.

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Bio: Dr. EL Sabbagh is a senior member of IEEE. He received the B.S. (with honors) and M.S. degrees in electrical engineering from Ain Shams University, Cairo, Egypt, in 1994 and 1997, respectively, and the Ph.D. degree from the University of Maryland College Park, College Park, MD in 2002.

From 1994 to 1998, he was a lecturer and research assistant with the Department of Electrical Engineering, Ain Shams University, where his research was related to the applications of superconductors in microwave circuits. In June 1998, he joined the Microwave Group, University of Maryland College Park. From May 2001 to June 2002, he was a Guest Researcher with the National Institute of Standards and Technology (NIST) Gaithersburg, MD. From September 2002 to July 2003, he was a Visiting Scientist with the United Stated Department of Agriculture -Agricultural Research Service (USDA-ARS). From 2003 to 2008, he was an Assistant Professor with the Department of Electrical Engineering, Ain Shams University. From December 2003 to January 2005, he led the microwave team at the National Authority for Remote Sensing and Space Sciences, Cairo, Egypt. In 2005, he was a Post-doctoral fellow with the Electrical and Computer Engineering Department, McMaster University, Canada. In 2006, he was a Post-doctoral fellow with the Electrical and Computer Engineering Department, University of Waterloo, Canada. His research interests include computer-aided design of microwave devices, microwave filter modeling and design for radar and satellites applications, dielectric characterization, metamaterial, and EM theory. From 2008 to 2010, he was a research professor at University of Arkansas developing his research in the area of RF Nanotechnology. Also, he is cofounder of EMWaveDev where he is involved in the design of ultra-wideband microwave components.
Currently, Dr. EL Sabbagh is a professor of practice in the EECS Department at Syracuse University.
          Dr. EL Sabbagh is a member of Sigma Xi and he was cited in the 2008 edition of Who’s Who in Science and Engineering.