The Next Wireless Frontier: Opportunities and Challenges at Millimeter-wave and Higher Frequencies


Date(s) - 13 Apr 2012
1:10 PM - 2:00 PM


3043 ECpE Building Addition

Title: The Next Wireless Frontier: Opportunities and Challenges at Millimeter-wave and Higher Frequencies

Speaker: Akbar M. Sayeed, Professor of Electrical and Computer Engineering – University of Wisconsin

Abstract: Wireless communications is poised for a new transformation. On the one hand, the demands on wireless bandwidth are exploding due to the proliferation of data-hungry devices. On the other hand, the wireless spectrum is essentially limited. Two technological trends offer new synergistic opportunities for delivering multi-gigabits/sec speeds: i) millimeter-wave (mm-wave) systems operating in the 10-300GHz, and ii) multi-antenna MIMO (multiple input, multiple output) transceivers that exploit the spatial dimension. However, harnessing these opportunities poses new challenges at the intersection of communication theory, signal processing, electromagnetics, antenna theory, and analog circuit design. In particular, while mm-wave greatly enables high-dimensional MIMO operation, conventional transceiver designs suffer from a prohibitively high complexity of the spatial analog-digital interface.

After briefly overviewing the wireless landscape and research in my group, I will discuss a new transceiver architecture – continuous aperture phased MIMO – that combines elements from MIMO theory, continuous aperture antennas, and phased arrays to fully harness the spatial dimension at mm-wave and higher frequencies. CAP-MIMO leverages a novel phased array structure – a high-resolution Discrete Lens Array – that enables analog beamforming for optimum beamspace communication with the lowest transceiver complexity. I will outline a general theoretical framework for modeling and analysis of CAP-MIMO in the context of other state-of-the-art approaches, and present initial results on the compelling capacity, power and complexity advantages of CAP-MIMO over competing designs.  I will end with a brief discussion of emerging opportunities at mm-wave and higher frequencies.

Biography: Akbar M. Sayeed is Professor of Electrical and Computer Engineering at the University of Wisconsin-Madison. He received the B.S. degree from the University of Wisconsin-Madison in 1991, and the M.S. and Ph.D. degrees from the University of Illinois at Urbana-Champaign in 1993 and 1996, all in Electrical and Computer Engineering. He was a postdoctoral fellow at Rice University from 1996 to 1997. His research interests include wireless communications, statistical signal processing, multi-dimensional communication theory, information theory, time-frequency analysis, and applications in wireless communication and sensor networks. Dr. Sayeed is a recipient of the Robert T. Chien Memorial Award (1996) for his doctoral work, the NSF CAREER Award (1999), the ONR Young Investigator Award (2001), and the UW Grainger Junior Faculty Fellowship (2003). Dr. Sayeed is a Fellow of the IEEE (2012), served as the technical program co-chair for the 2007 IEEE Statistical Signal Processing Workshop and the 2008 IEEE Communication Theory Workshop, and currently serves on the Signal Processing for Communications and Networking technical committee of the IEEE Signal Processing Society.

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