[CPCC] TALK Oct 13 Optimal Operating Point for MIMO MAC

[Ender Ayanoglu]

		                   TALK

           Optimal Operating Point for MIMO Multiple Access Channel
			      with Bursty Traffic

                               Prof. Tara Javidi
                  Electrical and Computer Engineering Department
                       University of California, San Diego

                              October 13, Friday
                                   11 AM
                           Calit2 Building Room 3008


                                  ABSTRACT

Multiple antennas at the transmitters and receivers in a multiple access
channel (MAC) can provide simultaneous diversity, spatial multiplexing,
and space-division multiple access gains. The fundamental tradeoff in the
asymptotically large SNR regime is shown by Tse et al (2004). On the
other hand, MAC scheduling can provide a statistical multiplexing gain to
improve the delay performance as shown by Bertsimas et al (1998). In this
talk, we formulate and analytically derive an optimal operating point
for MIMO-MAC channel for bursty sources with delay constraints. Our system
model brings together the four types of gains: diversity, spatial
multiplexing, space-division multiple-access provided at the PHY layer, and
statistical multiplexing gains at the MAC layer. Our objective is to
minimize the end-to-end performance as defined by the delay bound violation
probability as well as the channel decoding error probability. We find
the optimal diversity gain and rate region in which the system should
operate.  In this, we note an interesting interplay between the intensity
of the traffic and resource pooling with regard to both multiple-access and
statistical multiplexing gains. Furthermore, we use this methodology to
discuss extensions to the issue of cooperation in wireless networks.

			   Speaker's Biography

Tara Javidi studied electrical engineering at Sharif University of
Technology, Tehran, Iran from 1992 to 1996. She received the MS degrees in
electrical engineering (systems), and in applied mathematics (stochastics)
from the University of Michigan, Ann Arbor, in 1998 and 1999,
respectively. She received her Ph.D. in electrical engineering and
computer science from the University of Michigan, Ann Arbor, in May 2002.

>From 2002 to 2004, she was an assistant professor at the Electrical
Engineering Department, University of Washington, Seattle. She joined
University of California, San Diego, in 2005, where she is currently an
assistant professor of electrical and computer engineering. She was a
Barbour Scholar during 1999-2000 academic year and received an NSF CAREER
Award in 2004.

Her research interests are in communication networks, stochastic resource
allocation, stochastic control theory, and wireless communications.