[CPCC] Seminar by Prof. Azadeh Vosoughi
Hamid Jafarkhani
hamidj at uci.edu
Wed Jul 6 16:09:13 PDT 2011
Title: Wireless Channel Uncertainty in Relay-Assisted Communication and
Distributed Detection Systems
Speaker: Prof. Azadeh Vosoughi, University of Rochester
Date: July 20, 2011, Wed.
Time: 11:00 AM
Venue: Engineering Hall 2430
ABSTRACT
One of the main challenges in wireless communications is coping with
channel uncertainty. Dealing with this uncertainty, and the limitations
it imposes, is tightly related to the specific system and its
application. In this talk, we consider two systems, namely a wireless
bi-directional relay-assisted communication system and a wireless
distributed detection system. We study the impacts of channel
uncertainty on the performance limits of these two systems and
investigate optimal transceiver designs that minimize these impacts.
For the bi-directional relay-assisted communications we consider a
training-based system, in which receivers learn the channels via
employing dedicated pilot symbols. Assuming Gaussian inputs and block
Rayleigh fading channel model, we study the trade-off between the
accuracy and the bandwidth/energy costs of channel estimation and
explore optimal transmit resource allocation, subject to network power
constraint. We consider Cramer-Rao lower bound for channel estimation,
sum-rate and outage probability bounds as the performance metrics.
Next, we discuss the effects of channel uncertainty on the design and
performance of a wireless distributed detection system that is tasked
with solving a binary hypothesis testing problem. We consider systems
with training-based and blind channel estimation and
coherent/non-coherent receptions. We investigate the optimal data fusion
rules that maximize the overall system detection reliability and error
exponent. Furthermore, we present and compare several detection and data
fusion designs that exploit diversity to combat channel uncertainty and
enhance system performance.
SPEAKER'S BIOGRAPHY
Azadeh Vosoughi is Wilmot Assistant Professor in the Department of
Electrical and Computer Engineering at the University of Rochester. She
received her BS degree from Sharif University of Technology, Tehran,
Iran, in 1997, her MS degree from Worcester Polytechnic Institute,
Worcester, MA, in 2001, and her PhD degree from Cornell University,
Ithaca, NY, in 2006, all in Electrical Engineering. Her research
interests lie in the areas of wireless relay-assisted communications,
distributed detection and estimation, and distributed source coding and
compression. She was the recipient of the Furth award in 2006 and was
appointed as Wilmot Assistant Professor in 2009 at the University of
Rochester. Dr. Vosoughi received the NSF CAREER award in 2011 for her
research on the integration of signal processing and communications for
distributed detection systems.
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