[CPCC] TALK: Feedback Techniques for MIMO Fri 2/27 11AM

[Ender Ayanoglu]

		       Prof. Robert W. Heath Jr.
                     University of Texas at Austin

                          February 27, 2004
                               Friday

                             11:00-12:00
				ET331

RECENT RESULTS ON FEEDBACK COMMUNICATION TECHNIQUES FOR MIMO SYSTEMS

Abstract:  The improvements in capacity and quality resulting from
multiple antennas, when used at both the transmitter and the receiver, are
now widely recognized. Optimizing the system using channel state
information at the transmitter can help to customize the transmitted
waveforms to increase throughput, favorably share resources among multiple
users, simplify decoding algorithms, and increase link quality. A
consequence of using multiple antennas, however, is an increase in the
number of channel state parameters. The limited bandwidth of the feedback
control channel thus makes the acquisition of channel state information a
daunting task. One promising solution is limited feedback communication
where quantized feedback is used to convey information about the channel
to the transmitter.

In this talk, I will describe some recent results on developing practical
algorithms for obtaining the benefits of perfect transmit channel
knowledge with only quantized channel state information. I will describe
our work on quantized precoding for spatial multiplexing systems,
quantized precoding for space-time block codes, and quantized beamforming
for MIMO-OFDM systems. A general theme will be that exploiting invariances
of carefully chosen distortion metrics allows us to leverage codebooks
designed in part from higher-dimensional subspace packings in the
Grassmann manifold.

Bio:

Robert W. Heath Jr. is an Assistant Professor in the Department of
Electrical and Computer Engineering at The University of Texas at Austin
and is a member of the Wireless Networking and Communications Group. He
received his B.S.E.E. (1996) and his M.S.E.E. (1997) degrees from the
University of Virginia, and the Ph.D.E.E. (2002) degree from Stanford
University. From 1998-2001, he was affiliated with the startup company
Iospan Wireless, Inc., in San Jose, CA. At Iospan he played a key role in
the design and implementation of the physical and link layers of the first
commercial MIMO-OFDM communication system. In 2003 he founded MIMO
Wireless Inc., a consulting company to support the advancement of MIMO
technology.  Prof. Heath's current research interests are antenna design,
coding, modulation, capacity analysis, scheduling, and mobility management
for multi-user MIMO wireless communication systems.

Host: Prof. Hamid Jafarkhani

Directions: www.cpcc.uci/edu/Directions-CPCC-UCI.htm