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Nortel Networks Institute Distinguished Seminar Series
(NNIDSS) :: Talks (year 2004)
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All talks index
::
2004
- Friday, November
5th
Wen Tong, "MIMO-OFDM From Theory to Practice
- A New Landscape for Very Broadband Wireless
Networks"
- Tuesday, November
2nd
Hikmet Sari, "Broadband Wireless Access
at Frequencies below 11 GHz"
- Monday, November
1
Robert Schober, "Optimization of Delay Diversity
for Optimum and Suboptimum Equalization"
- Thursday September
9
Behnaam Aazhang, "Cooperative Communication:
Fundamental Limits and Enabling Technologies"
- Monday June 26
Parham Aarabi, "Multi-Microphone Speech
Processing, or, Why Two Ears Are Better
Than One"
- Monday June 21
Max Wong, "PLUTO: An Optimum Linear Space-Time
Code for MIMO Communications"
- Monday June 14
Uri Erez, "Approaching the dirty paper limit
for canceling known interference"
- Thursday, May
13
Zhi-Quan (Tom) Luo,
"Decentralized Estimation With a Bandwidth-Constrained
Sensor Network"
- Monday, May 10
Bertrand Hochwald
, "Multiple Antennas Have a Big Multi-User
Advantage in Wireless Communications"
- Monday, April
26
Prof. Marc Fossorier, "Reliability-Based
List Decoding of Linear Block Codes"
- Friday, March
9
J. Nicholas Laneman,
"Source-Channel Diversity Approaches
for Multimedia Communication"
- Friday, February
13
Wei Yu, "Duality in
Multi-user Uplink and Downlink Channels"
Note:
Everyone is welcome.
2
Date |
Friday, November 5th, 2004
|
Title |
MIMO-OFDM From Theory to Practice
- A New Landscape for Very Broadband
Wireless Networks |
By |
Wen Tong,
Chief Architect for the advanced
research on next generation
broadband wireless mobile system,
Nortel Networks
|
Venue |
DC 1302,
University of Waterloo
(Directions...) |
Time |
1:30 - 2:30 pm |
Abstract of the Talk |
In this talk,
we present the MIMO-OFDM as
the key enabling technology
for defining the next generation
broadband wireless mobile networks.
We give a system architecture
overview of MIMO-OFDM and its
potential impacts. The key research
areas and direction MIMO-OFDM
are discussed. We also introduce
the design for the industry
1st MIMO-OFDM standard: IEEE802.16d/e
for the wireless metropolitan
access and the emerging IEEE802.11n
standard for the wireless local
areas access.
|
Presentation File
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Biography |
Wen Tong received the M.Sc and
Ph.D degrees in Electrical Engineering
in 1986 and 1993 respectively.
He joined the Wireless Technology
Labs, Nortel Networks in 1995,
where he is currently a senior
advisor. He has worked in many
areas in the wireless access
networks with emphasis on the
air interface and physical layer
development. He is now the chief
architect for the advanced research
on next generation broadband
wireless mobile system in Nortel
Networks.
|
Date |
Tuesday, November 2nd, 2004 |
Title |
Broadband Wireless Access at
Frequencies below 11 GHz |
By |
Hikmet Sari, Professor and Chair
of the Telecommunications Department
at the
Ecole Supérieure d’Electricité
(SUPELEC)
|
Venue |
DC 1302,
University of Waterloo
(Directions...) |
Time |
10:00 am |
Abstract of the Talk |
Broadband wireless
access (BWA) at frequencies
below 11 GHz is an interesting
technology, particularly for
new operators without an existing
wired infrastructure. The frequencies
available for this type of networks
include the 2.5 GHz microwave
multipoint distribution service
(MMDS) band in the US, the 3.5
GHz band all across Europe,
and the 10 GHz which is available
in a number of countries. There
are also license-exempt frequency
bands at 2.5 GHz and 5 GHz.
First-generation BWA systems
are today in the field, but
their deployment is still very
modest compared to DSL and cable
modem technologies. To foster
the mass deployment of BWA systems,
the IEEE 802.16 and ETSI BRAN
groups have recently developed
technical specifications for
interoperable systems.
Unlike BWA systems operating
at millimeter-wave frequencies
(usually referred to as LMDS
systems), BWA systems operating
at microwave frequency bands
below 11 GHz are non-line-of-sight
and require a transmission technique
that is very robust to multipath
propagation. The IEEE 802.16a
specifications for BWA at licensed
frequency bands between 2 and
11 GHz include three different
transmission and multiple access
techniques, namely single-carrier
transmission with frequency-domain
equalization (SCT/FDE), orthogonal
frequency-division multiplexing
with time-division multiple
access (OFDM/TDMA), and orthogonal
frequency-division multiple
access (OFDMA). But although
the ETSI BRAN group has significantly
harmonized its specifications
with those of the IEEE 802.16,
its specifications are restricted
to the OFDM/TDMA mode.
In this talk, we give a general
presentation of BWA at frequencies
below 11 GHz, describe the technical
challenges, highlight the current
trends, and discuss the potential
technologies. In particular,
we highlight the fact that the
main issue in these systems
is frequency-domain processing
vs. time-domain processing rather
than OFDM vs. single-carrier
transmission, which is the traditionally
debated issue.
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Presentation File
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Biography |
Hikmet Sari received his engineering
degree and his Ph.D. from the
ENST, Paris, France, in 1978
and 1980, respectively. He also
received the post-doctoral Habilitation
degree from the University of
Paris XI in January 1992. From
1978 to 1989, he was with the
Philips Research Laboratories,
first as research engineer and
later as group supervisor. He
was a Department Head at the
SAT Telecommunications Division
from 1989 to 1996 and R&D Director
for Radio Communications at
Alcatel from September 1996
to April 2000. From May 2000
to November 2002, he was Chief
Scientist at Pacific Broadband
Communications, which was acquired
by Juniper Networks in December
2001. He is currently a Professor
and Chair of the Telecommunications
Department at the Ecole Supérieure
d’Electricité (Supélec), near
Paris. Over the past 25 years,
he has been a major contributor
to the field of digital communications
and he has published some 140
journal and conference papers.
Dr. Sari was Editor for Channel
Equalization of the IEEE Transactions
on Communications from 1987
to 1991. He served as a Guest
Editor of the European Transactions
on Telecommunications in 1993
and of the IEEE Journal on Selected
Areas in Communications in 1999.
He was on the Editorial Board
of the Annals of Telecommunications
from 1994 to 1997 and an Associate
Editor of the IEEE Communications
Letters from 1999 to 2002. In
1995, he was elected to the
IEEE Fellow Grade and he received
the Andre Blondel Medal from
the French Electrical & Electronics
Engineering Society SEE. He
was Technical Program Chair
of the 2004 IEEE International
Conference on Communications
(ICC 2004). He was the recipient
of the Edwin H. Armstrong Achievement
Award in 2003. He is currently
serving as Distinguished Lecturer
and Member of the Fellow Evaluation
Committee of the IEEE Communications
Society and also as Vice-Chair
of ICC 2006.
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Date |
Monday, November 1st, 2004 |
Title |
Optimization of Delay Diversity
for Optimum and Suboptimum Equalization |
By |
Robert Schober, University
of British Columbia
|
Venue |
DC 1304, University of Waterloo
(Directions...) |
Time |
10:00 am-noon |
Abstract of the Talk |
Although most of the initial
research on transmit diversity
(TD) assumed flat fading channels,
more recently it has been shown
that TD can also lead to significant
performance improvements for
frequency-selective fading channels.
Frequency-selective fading channels
are encountered in e.g. the
Global System for Mobile Communications
(GSM), the Enhanced Data rates
for GSM Evolution (EDGE) system,
and future broad-band wireless
systems. However, most TD schemes
are not well suited for upgrading
existing mobile communication
systems such as GSM or EDGE
since they would require major
changes in the burst structure
and the receiver processing.
A simple TD scheme that does
not entail these drawbacks is
delay diversity (DD). DD was
originally proposed by Wittneben
for application in flat fading
channels, but has recently been
extended to frequency-selective
channels by Paulraj et al. In
this presentation, we will propose
optimized delay diversity (ODD)
schemes for optimum and suboptimum
equalization at the receiver
side. The novel schemes require
knowledge of the statistical
properties of the channel impulse
response (CIR) at the transmitter,
but the CIRs themselves have
to be available only at the
receiver side. We derive optimization
criteria for different types
of equalizers (MLSE, DFE, linear
equalization) and adaptive algorithms
for recursive calculation of
the ODD transmit filter coefficients.
Analytical and simulation results
show large performance gains
of the proposed ODD schemes
over previously proposed DD
schemes. Our results also show
that a high performance can
only be achieved if DD is optimized
for the particular equalizer
used at the receiver. Furthermore,
we show that, in contrast to
the frequency-nonselective case,
for frequency-selective channels
transmit diversity schemes designed
under the high SNR assumption
may perform poorly for practically
relevant SNRs.
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Presentation File
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Biography |
Robert Schober was born in Neuendettelsau,
Germany, in 1971. He received
the Diplom (Univ.) and the Ph.D.
degrees in electrical engineering
from the University of Erlangen-Nuernberg
in 1997 and 2000, respectively.
From May 2001 to April 2002
he was a Postdoctoral Fellow
at the University of Toronto,
Canada, sponsored by the German
Academic Exchange Service (DAAD).
Since May 2002 he has been an
Assistant Professor and Canada
Research Chair (Tier II) in
Wireless Communication at the
University of British Columbia
(UBC), Vancouver, Canada. His
research interests include noncoherent
detection, equalization, multiuser
detection, MIMO systems, space-time
processing and coding, and ultra-wideband
communication.
In 2001, Dr. Schober was a co-recipient
of the best paper award of the
German Information Technology
Society (ITG). In 2002, he received
the Heinz Maier-Leibnitz Award
of the German Science Foundation
(DFG). He also received the
2004 Innovations Award of the
Vodafone Foundation for Research
in Mobile Communications. He
currently serves as Editor forDetection,
Equalization, and MIMO for the
IEEE Transactions on Communications
and as Guest Editor for a special
issue on noncoherent and differential
wireless communication for the
IEEE Journal on Selected Areas
in Communications.
|
Date |
Sept. 9th, 2004 |
Title |
Cooperative Communication: Fundamental
Limits and Enabling Technologies |
By |
Behnaam Aazhang, Department
of Electrical and Computer Engineering,
Rice University
|
Venue |
EIT 3142, University of Waterloo
(Directions...) |
Time |
10:00 am |
Abstract of the Talk |
Within the last five years,
there has been a cultural shift
from wired landlocked connectivity
to pervasive wireless information
access. Most emerging mobile
devices are now equipped with
some form of embedded wireless
radio. The expectations of high
data rates and increased battery
longevity have put tremendous
pressure on all aspects of wireless
system design. To meet the challenges
of next generation wireless
system design, we need fundamentally
new methods to exploit all available
dimensions of communication
channels and network.
In this presentation, I will
talk about emerging systems
and network level techniques
to increase spectral and power
efficiency of communication
systems, and extend coverage
of wireless networks. The cooperative
communication paradigm pools
distributed resources of different
nodes, such that the nodes act
like a collaborative system
instead of greedy adversarial
participants. I will present
our research and development
plans in the context of a scalable
experimental wireless system
for mobile broadband Internet.
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Presentation File
|
PowerPoint file, enriched with
speaker's original talk in audio
(size: 49 MB)
PowerPoint file, no voice
(size: 700 KB)
Notes about the PPT file(s):
|
Biography |
Behnaam Aazhang received his
B.S. (with highest honors),
M.S., and Ph.D. degrees in Electrical
and Computer Engineering from
University of Illinois at Urbana-Champaign
in 1981, 1983, and 1986, respectively.
From 1981 to 1985, he was a
Research Assistant in the Coordinated
Science Laboratory, University
of Illinois. In August 1985,
he joined the faculty of Rice
University, Houston, Texas,
where he is now the J.S. Abercrombie
Professor and Chair of the Department
of Electrical and Computer Engineering
and also the Director of Center
for Multimedia Communications.
He has been a Visiting Professor
at IBM Federal Systems Company,
Houston, Texas, the Laboratory
for Communication Technology
at Swiss Federal Institute of
Technology (ETH), Zurich, Switzerland,
the Telecommunications Laboratory
at University of Oulu, Oulu,
Finland, the U.S. Air Force
Phillips Laboratory, Albuquerque,
New Mexico, and at Nokia Mobile
Phones in Irving, Texas. His
research interests are in the
areas of communication theory,
information theory, and their
applications with emphasis on
multiple access communications,
cellular mobile radio communications,
and wireless communication networks.
Dr. Aazhang is a Fellow of IEEE,
a recipient of the Alcoa Foundation
Award 1993, the NSF Engineering
Initiation Award 1987-1989,
and the IBM Graduate Fellowship
1984-1985, and is a member of
Tau Beta Pi and Eta Kappa Nu.
He is also a recipient of 2004
IEEE Communication Society's
Stephen O. Rice best paper award
for a paper with A. Sendonaris
and E. Erkip. He is currently
serving on Houston Mayor's Commission
on Cellular Towers and as the
chair of the Technical Program
Committee for 2005 Asilomar
Conference, Monterey, CA. He
has served as the Editor for
Spread Spectrum Networks of
IEEE Transactions on Communications
1993-1998, as the Treasurer
of IEEE Information Theory Society
1995-1998, the Secretary of
the Information Theory Society
1990-1993, the Publications
Chairman of the 1993 IEEE International
Symposium on Information Theory,
San Antonio, Texas, and as the
co-chair of the Technical Program
Committee of 2001 Multi-Dimensional
and Mobile Communication (MDMC)
Conference in Pori, Finland.
|
Date |
July 26, 2004 |
Title |
Multi-Microphone Speech Processing,
or, Why Two Ears Are Better
Than One |
By |
Parham Aarabi, University
of Toronto
|
Venue |
DC 1304, University of Waterloo
(Directions...) |
Time |
2:00 pm |
Abstract of the Talk |
Speech recognition will one
day revolutionize how humans
and computers interact, and
in turn, how and where computers
are used. Before this can happen,
speech recognition systems must
become accurate and robust,
all the while remaining computationally
feasible. This talk will introduce
current microphone array based
robust speech processing research
at the University of Toronto's
Artificial Perception Laboratory
(APL -
www.apl.utoronto.ca).
We start by introducing novel
sound source localization techniques,
followed by microphone array
based speech de-noising and
separation. Finally, we shall
discuss hardware acceleration
and FPGA/VLSI implementation
of our multi-microphone speech
processing algorithms.
|
Presentation File
|
PowerPoint file, enriched with
speaker's original talk in audio
(size: 47 MB)
PowerPoint file, no voice
(size: 23 MB)
Notes about the PPT file(s):
|
Biography |
Professor Parham Aarabi is a
faculty member in the Department
of Electrical and Computer Engineering
at the University of Toronto,
a Canada Research Chair in Multi-Sensor
Information Systems, and the
founder and director of the
Artificial Perception Lab. Prof.
Aarabi received his Ph.D. in
Electrical Engineering from
Stanford University in 2001,
his M.A.Sc. in Electrical and
Computer Engineering from the
University of Toronto in 1999,
and his B.A.Sc. in Engineering
Science (Electrical Option)
from the University of Toronto
in 1998. Prof. Aarabi has been
the recipient of numerous teaching
and research awards, including
the Ontario Distinguished Researcher
Award, the 2002 Best Computer
Engineering Professor Award,
the Early Career Teaching Award,
and the 2003 Professor of the
Year Award. His current research,
which includes multi-sensor
information fusion, human-computer
interactions, and FPGA/VLSI
implementation of sensor fusion
algorithms, has been extensively
covered by a variety of newspapers
and television shows including
the Discovery Channel, CBC Newsworld,
and Scientific American.
|
Date |
Monday, June 21, 2004 |
Title |
PLUTO:
An Optimum Linear Space-Time Code
for MIMO Communications |
By |
Max Wong, McMaster University
|
Venue |
DC
1304, University of Waterloo
(Directions...) |
Time |
10 am |
Abstract
of the Talk |
Signal processing
designs have benefited much from
the theory of convex optimization
recently. There are various types
of optimum design problems to which
convex optimization can be applied.
In this talk, we focus on the use
of Jensen's Inequality and obtain
an optimum class of linear space-time
block code for a multi-input multi-output
(MIMO) communication system.
We examine the problem of designing
a linear code which achieves full
transmission data rate for MIMO
communication systems under a quasi
static Rayleigh flat fading environment.
The channel information is assumed
unknown to the transmitter but known
at the receiver. Our design targets
specifically at the use of a linear
receiver for which a minimum mean
square error (MMSE) equalizer is
employed, and minimizes the averaged
bit error probability when the transmitted
signal is selected from a Q PSK
constellation. By repeatedly applying
the Jensen's Inequality, we arrive
at an optimum code which is shown
to have the structure such that
the individual coding matrices a)
are mutually trace orthogonal, b)
are all unitary, and c) have equal
power. We call this class of codes
PLUTO (Power-distributed, Linear,
Unitary, Trace .Orthogonal). An
algorithm is presented to provide
for an efficient generation of our
codes, and simulation results confirm
that our optimally designed codes
are indeed superior in performance
compared to other commonly used
codes.
|
Presentation File
|
Notes
about the above two PPT files:
-
They are read-only due to the
copyright issues.
-
Opening them
requires a recent version of
Microsoft Office supporting
password protection feature
(Office
XP or
higher versions).
|
Biography |
Kon
Max Wong received his BSc(Eng),
DIC, PhD, and DSc(Eng) degrees,
all in electrical engineering, from
the University of London, England,
in 1969, 1972, 1974 and 1995, respectively.
He started working at the Transmission
Division of Plessey Telecommunications
Research Ltd., England, in 1969.
In October 1970 he was on leave
from Plessey pursuing postgraduate
studies and research at Imperial
College of Science and Technology,
London. In 1972, he rejoined Plessey
as a research engineer and worked
on digital signal processing and
signal transmission. In 1976, he
joined the Department of Electrical
Engineering at the Technical University
of Nova Scotia, Canada, and in 1981,
moved to McMaster University, Hamilton,
Canada, where he has been a Professor
since 1985 and served as Chairman
of the Department of Electrical
and Computer Engineering in 1986
– 87 and 1988 – 94. Professor Wong
was on leave as Visiting Professor
at the Department of Electronic
Engineering of the Chinese University
of Hong Kong from 1997 to 1999.
At present, he holds the NSERC-Mitel
Professorship of Signal Processing
and is the Director of the Communication
Technology Research Centre at McMaster
University. He is also serving as
Chair of the Department of Electrical
and Computer Engineering from 2003
– 08. His research interest is in
signal processing and communication
theory and has published over 170
papers in the area.
Professor Wong was the recipient
of the IEE Overseas Premium for
the best paper in 1989, and is a
Fellow of IEEE, a Fellow of the
Institution of Electrical Engineers,
a Fellow of the Royal Statistical
Society, and a Fellow of the Institute
of Physics. He also served as an
Associate Editor of the IEEE Transaction
on Signal Processing, 1996-98 and
has been a member and chair of the
IEEE Sensor Array and Multichannel
Technical Committee of the Signal
Processing Society.
Professor Wong was the recipient
of a medal presented by the International
Biographical Centre, Cambridge,
England, for his outstanding contributions
to the research and education in
signal processing in May 2000, and
was honoured with the inclusion
of his biography in the two books:
Outstanding People of the 20th Century
and 2000 Outstanding Intellectuals
of the 20th Century published by
IBC to celebrate the arrival of
the new millennium.
|
Date |
Monday June 14, 2004 |
Title |
Approaching
the dirty paper limit for canceling
known interference |
By |
Uri Erez, Massachusetts Institute
of Technology
|
Venue |
EIT 3142,
University of Waterloo
(Directions...) |
Time |
10 am |
Abstract
of the Talk |
It has recently been
recognized that Costa's "Writing
on dirty paper'' channel model offers
an information theoretic framework
for precoding techniques for canceling
arbitrary interference known to
the transmitter. In particular,
this observation implies that lossless
precoding is theoretically possible
at any SNR. Among the applications
are broadcast over muliple-input
multiple-output (MIMO) channels,
intersymbol interference (ISI) mitigation
and digital watermarking. We review
the dirty paper coding framework
as well as its applications. We
describe a dirty paper coding scheme
using lattice strategies coupled
with MMSE scaling. Realizing such
a system however has proven to be
challenging, posing numerous problems
of independent interest, and necessitates
the introduction of novel coding
techniques. We will address these
issues and present an end-to-end
coding realization of a system materializing
a significant portion of the promised
gains.
Joint work with Stephan ten Brink,
Realtek, Irvine, CA.
|
Presentation File
|
|
Biography |
Uri
Erez came to MIT from Tel-Aviv University,
where he completed undergraduate
degrees in mathematics and physics
in 1996, and his masters and doctoral
degrees in 1999 and 2003, respectively.
His doctoral research was in the
area of coding and communication
in the presence of known interfererence.
He is currently a postdoctoral scholar,
working on problems of communication
with side information, and applications
of lattices in digital communication.
Uri has served as a consultant for
a number companies, among them Lucent
Technologies' Bell Laboratories,
Tadiran-Systems and Ultracom. He
received the Omicron Delta prize
for his presentation at the 2000
Israel IEEE Convention. His research
interests encompass information
theory and digital communication.
|
Date |
Thursday May 13, 2004 |
Title |
Decentralized
Estimation With a Bandwidth-Constrained
Sensor Network |
By |
Zhi-Quan
(Tom) Luo,
University of Minnesota
|
Venue |
DC-1304,
Davis Center, University of Waterloo
(Directions...) |
Time |
3:00
pm |
Abstract
of the Talk |
Consider a situation
where a set of distributed sensors
and a fusion center wish to corporate
to estimate an unknown parameter
over a bounded interval. Each sensor
collects one noise-corrupted sample,
performs a local estimation, and
transmits a message to the fusion
center, while the latter combines
the received messages to produce
a final estimate. In this talk we
will discuss optimal local estimation
and final fusion schemes under the
constraint that the communication
from each sensor to the fusion center
must be an one-bit binary message.
Such binary message constraint is
well motivated by the bandwidth
limitation of the communication
links, and by the limited power
budget of local sensors. The proposed
decentralized estimation scheme
is universal (i.e., works for all
noise pdf), satisfies the binary
message constraint, and requires
only a factor of 4 increase in the
number of sensors to achieve the
same mean squared error when the
binary message constraint is absent.
Furthermore, this scheme suggests
allocating 1/2 of the sensors to
estimate the first bit of the unknown
parameter, 1/4 of the sensors to
estimate the second bit, and so
on. Extensions to the ad hoc sensor
network case (with no fusion center)
and to the inhomogeneous sensing
environment will also be discussed.
|
Presentation File
|
PowerPoint file, enriched with speaker's
original talk in audio (size:
47 MB)
Notes
about the PPT file:
|
Biography |
Zhi-Quan (Tom) Luo
received his B.Sc. degree in Applied
Mathematics in 1984 from Peking
University, Beijing,China. Subsequently,
he was selected by a joint committee
of American Mathematical Society
and the Society of Industrial and
Applied Mathematics to pursue Ph.D
study in the United States. After
an one-year intensive training in
Mathematics and English at the Nankai
Institute of Mathematics, Tianjin,
China, he entered the Operations
Research Center and the EECS department
at MIT in 1985, and received a Ph.D
degree in 1989. Upon graduation,
he joined the Department of Electrical
and Computer Engineering, McMaster
University, Hamilton, Canada, where
he is now a Professor and holds
a Canada Research Chair in Information
Processing. Since April of 2003,
he has been with the Department
of Electrical and Computer Engineering
at the University of Minnesota (TwinCities)
as an ADC Processor of wireless
communication. His research interests
lie in the union of optimization
algorithms, data communication and
signal processing, information theory
and coding. He currently serves
on the editorial boards for a number
of international journals including
SIAM Journal on Optimization, IEEE
Transactions on Signal Processing.
|
2
Date |
Monday May 10, 2004 |
Title |
Multiple Antennas Have a
Big Multi-User Advantage
in Wireless Communications |
By |
Bertrand Hochwald, Mathematics
of Communications Research,
Bell Laboratories
|
Venue |
EIT 3142,
University of Waterloo
(Directions...) |
Time |
10 am |
Abstract of the Talk |
Advanced
multiple-antenna wireless
techniques, while a hotbed
of exciting research, are
only slowly gaining commercial
acceptance. One of the main
stumbling blocks is that
although basestations (or
access points) are often
provided with two or more
antennas, it is difficult
to equip small terminals
with more than one. Since
we may be stuck with single-antenna
terminals for a while, it
becomes important to find
techniques that obtain throughput
on a multi-user system that
scales linearly with the
number of antennas. I will
show how it is possible,
provided that accurate channel
information is available
at the access point.
|
Presentation File
|
PowerPoint file, enriched
with speaker's original
talk in audio (size:
46 MB)
PowerPoint file, no voice
(size: 300 KB)
Notes about the above two
PPT files:
|
Biography |
Bertrand
Hochwald was born in New
York, NY. He received his
undergraduate education
from Swarthmore College,
Swarthmore, PA and the M.S.
in electrical engineering
from Duke University, Durham,
NC. From 1986 to 1989 he
worked for the Department
of Defense at Fort Meade,
MD. In 1989 he enrolled
at Yale University, New
Haven, CT, where he received
the M.A. in statistics and
the Ph.D. in electrical
engineering. In 1995-1996
he was a research associate
and visiting assistant professor
at the Coordinated Science
Laboratory, University of
Illinois, Urbana-Champaign.
He joined the Mathematics
of Communications Research
Department at Lucent Technologies
Bell Laboratories in September
1996, where he is currently
a Distinguished Member of
the Technical Staff.
He is the
recipient of several achievement
awards while employed at
the Department of Defense
and the Prize Teaching Fellowship
at Yale. He has served on
several IEEE journal editorial
boards and was a guest-editor
for special issues on multi-antenna
signal processing and communication
techniques. He is the inventor
or co-inventor of many wireless
communication techniques
and holds several patents
on multi-antenna methods.
|
Date |
Monday April 26, 2004 |
Title |
Reliability-Based List Decoding
of Linear Block Codes |
By |
Prof.
Marc Fossorier, University
of Hawaii
|
Venue |
DC-1304, Davis Center, University
of Waterloo
(Directions...) |
Time |
10:00 am |
Abstract of the Talk |
In this talk,
we review several reliability-based
soft decision decoding techniques,
which allow to achieve near-MLD
performance of rate-1/2
block codes of lengths up
to 200 bits. The ordered
statistic decoding (OSD)
algorithm is first reviewed.
Its recent improvements,
which include the use of
memory and an iterative
approach, are then presented.
It is shown that these new
techniques reduce the original
worst case complexity of
the OSD algorithm to its
squared-root. A general
method to tightly bound
the error performance of
these algorithms is also
presented. Results for both
binary linear codes and
Reed Solomon codes based
on their binary images are
finally given.
|
Presentation File
|
PowerPoint file, enriched
with speaker's original
talk in audio (size:
40 MB)
PowerPoint file, no voice
(size: 900 KB)
Notes about the above two
PPT files:
|
Biography |
Marc Fossorier
received the B.E. degree
from the National Institute
of Applied Sciences (I.N.S.A.)
Lyon, France in 1987, and
the M.S. and Ph.D. degrees
from the University of Hawai'i
at Manoa, Honolulu, USA
in 1991 and 1994, all in
electrical engineering.
In 1996, he joined the Faculty
of the University of Hawai'i,
Honolulu, as an Assistant
Professor of Electrical
Engineering. He was promoted
to Associate Professor in
1999. In 2002, he was a
Visiting Professor at Ecole
Nationale Superieure des
Telecommunications (ENST),
Paris, France.
His research interests include
decoding techniques for
linear codes, communication
algorithms and statistics.
He coauthored (with S. Lin,
T. Kasami and T. Fujiwara)
the book, "Trellises and
Trellis-Based Decoding Algorithms,"
(Kluwer Academic Publishers,
1998).
Dr. Fossorier is a recipient
of a 1998 NSF Career Development
award. He has served as
Editor for the IEEE Transactions
on Information Theory since
2003, as Editor for the
IEEE Communications Letters
since 1999, as Editor for
the IEEE Transactions on
Communications from 1996
to 2003, and as the Treasurer
of the IEEE Information
Theory Society from 2000
to 2003. Since 2002, he
has also been a member of
the Board of Governors of
the IEEE Information Theory
Society.
He was Program Co-Chairman
for the 2000 International
Symposium on Information
Theory and Its Applications
(ISITA) and Editor for the
Proceedings of the 2003
and 1999 Symposium on Applied
Algebra, Algebraic Algorithms
and Error Correcting Codes
(AAECC).
He is a member of the IEEE
Information Theory and Communications
Societies.
|
Date |
Tuesday March 9, 2004 |
Title |
Source-Channel Diversity
Approaches for Multimedia
Communication |
By |
J.
Nicholas Laneman
University of Notre Dame
|
Venue |
DC 1304, Davis Center, University
of Waterloo
(Directions...) |
Time |
10:00 am |
Abstract of the Talk |
Diversity
techniques are often employed
to average over independent
fluctuations in a communications
medium, thereby reducing
variations in performance
and often dramatically improving
average performance. For
communication of multimedia
signals, such as audio or
video, there are two basic
approaches to exploiting
diversity in such scenarios:
channel coding at the physical
layer, or multiple description
source coding at the application
layer. We introduce a framework
for analyzing and comparing
these approaches, and develop
a joint source-channel approach
based upon multiple descriptions
that leverages the benefits
of both. The model and results
apply to wireless channels
with disjoint frequency
bands and/or multiple antennas,
and to wired networks such
as the Internet with multiple
paths between a source and
destination.
Joint work with John Apostolopoulos
at Hewlett-Packard Labs
and Emin Martinian and Gregory
Wornell at MIT.
|
Presentation File
|
PowerPoint file, enriched
with speaker's original
talk in audio (size:
28 MB)
PowerPoint file, no voice
(size: 0.5 MB)
Question/Answer period
(size: 4 MB)
Notes about the above two
PPT files:
|
Biography |
J. Nicholas
Laneman is an Assistant
Professor of Electrical
Engineering at the University
of Notre Dame. He earned
a Ph.D. in Electrical Engineering
from the Massachusetts Institute
of Technology, Cambridge,
MA, in 2002. His research
interests are in wireless
communications and networking,
information theory, and
detection & estimation.
He received the MIT EECS
Harold L. Hazen Teaching
Award in 2001 and the ORAU
Ralph E. Powe Junior Faculty
Enhancement Award in 2003.
He is a member of IEEE,
ASEE, and Sigma Xi.
|
Date |
Friday February 13,
2004 |
Title |
Duality in Multi-user Uplink
and Downlink Channels |
By |
Wei
Yu
Electrical and Computer
Engineering Department
University of Toronto |
Venue |
DC 1304, Davis Center, University
of Waterloo
(Directions...) |
Time |
2:00 pm |
Abstract of the Talk |
There is
an interesting duality between
multi-user uplink and downlink
channels. Under the same
power constraint, the Gaussian
broadcast channel and the
multiple access channel
have identical capacity
regions. In the first part
of the talk, we give a new
interpretation of this duality
by showing that uplink-downlink
duality is equivalent to
Lagrangian duality in convex
optimization. This new interpretation
not only gives an efficient
numerical computation method
for the sum capacity, it
also provides new insights
into the structure of the
broadcast channel. In particular,
we show that the dual of
a broadcast channel with
per-antenna power constraints
is a multiple-access channel
with a diagonal uncertain
noise. In the second part
of the talk, we use duality
to characterize the optimal
spatial multiplex scheme
in a multi-user wireless
environment. It is shown
that in a multi-user fading
channel with N antennas
at the base-station, the
number of active users in
the optimal transmission
strategy is upper bounded
by 1/2 N(N+1) at any given
time. Thus, antennas are
spatial resources. Multiple
antennas at the base-station
have the effect of creating
extra spatial dimensions
that allow multiple users
to be accommodated at the
same time.
|
Presentation File
|
Slides
Enriched with speaker's
original talk in audio
(size: 27 MB) |
Biography |
Wei Yu received
B.A.Sc in Computer Engineering
and Mathematics from the
University of Waterloo in
1997, and M.S. and Ph.D.
in Electrical Engineering
from Stanford University
in 1998 and 2002, respectively.
He is now an Assistant Professor
in the Electrical and Computer
Engineering Department at
the University of Toronto,
where he also holds a Canada
Research Chair in digital
communications. His main
research interests are in
information theory, coding
and communication system
design.
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