FENS SEMINAR ANNOUNCEMENT

"Interference Prediction, Avoidance and Mitigation in
Multihop Wireless


Networks"



Ufuk Tureli, Ph.D.

November 26, 2010, FENS L067, 13:40

 

Abstract:



Interference in the physical layer of
wireless networks is due frequency

reuse. We present novel analytical and
experimental studies on dynamic

spectrum reuse. For effective resource
allocation which uses scheduling

for 3G cellular systems, we developed
analytic expressions for the

distribution of predicted signal to
interference ratio in an

uncoordinated multi-cell 3G EVDO network with a
frequency reuse factor

of 1 and verified prediction with real world data
collected by Lucent.

This has been used to develop a practical scheduler
with minimal

capacity loss subject to an outage constraint.  



Multiple hopping can be used to enhance the throughput, network
coverage

and capacity for indoors and outdoors in infrastructure networks.
We

examine improvement in outage capacity with a single relay for indoor

coverage with significant building insertion loss first. Recently,

hybrid wireless networks which take on the best features of

infrastructure and ad hoc networks have been proposed for 4G networks.

Spatial variability of spectrum use observed in broadband spectrum

occupancy measurements  motivate a novel framework exploit spectrum

which allows a significant improvement in bandwidth efficiency and

capacity by considering spectrum holes in the spatial domain as well as

the temporal domain. We examine  an outdoor cognitive network can be

implemented within a primary system, to assist disadvantaged users while

minimizing interference and satisfying protection constraints by

judicious power control and scheduling.



Multiple hopping is a key
feature of ad hoc networks, but lacking a

centralized controller,
interference mitigation is a major problem. This

problem can be avoided
using multiple antennas at transmitters and

receivers. Closed loop feedback
multiple input multiple output (MIMO) ad

hoc network can greatly improve
system performance at a cost of

significant signaling overhead and/or
exploiting reciprocity between

transmitter and receiver channels, limiting
suitability to dynamic

interference and information. Reduced feedback MIMO
in an ad hoc network

is implemented. A distributed game is formulated and is
shown to

converge using numerical analysis. Open problems and preliminary
work

for next generation ad hoc networks with multiple radio frequency (RF)

chains suitable  for dynamic channel and MIMO
configuration.



Short Biography:

Ufuk Tureli  received the
B.Sc. degree from Bogazici University,

Istanbul, Turkey and the M.S. and
Ph.D. degrees from the University of

Virginia, Charlottesville, Virginia in
1998 and 2000 respectively, all

in electrical engineering. Since January
2008, he is an associate

professor and Director of the Radio Frequency
Laboratory in the

Department of Electrical and Computer Engineering, West
Virginia

University Institute of Technology, Montgomery, WV.

From July
2000- December 2007, Dr. Tureli was an assistant professor,

director of
wireless research laboratory in the  Electrical and Computer

Engineering Department and From Sep 2005-December 2007 associate

director of the Wireless Network Security Center, Stevens Institute of

Technology, Hoboken, NJ,  His research is scalable and robust wireless

networks from  physical  to network layers. His current research
focuses

on interference prediction, cross layer design, and spatial reuse of

spectrum .



Dr. Tureli is a member of the IEEE Communications Society,
serves in

technical program committees (TPC) for IEEE Globecom, Milcom, ICC
and

WCNC conferences as well as the IEEE Communications Society (COMSOC)

Radio Communications Committee. He is on the Editorial Board of the

Elsevier Physical Communication (PHYCOM)  Journal and serves as an

Associate Editor. Dr. Tureli was an Associate Editor for IEEE

Transactions on Vehicular Technology in 2009.