Newsletter from Ohio State University
Information Processing Systems Lab
Spring 2002
Vol. 5 No. 1
IPS-o Facto
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eb page: http://ee
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Life After Graduate School:
Riegelsberger Discovers
Name of Game is Xbox
d L. Riegelsberger
For Edwar
dward
Riegelsberger,, gaming is the
thing and Xbox is the name.
William Pierson
Air Force Taps Pierson for
Swedish Research Post
William E. “B
ill
ierson, MS, 1993; PhD,
“Bill
ill”” P
Pierson,
1998, a project engineer with the U.S. Air
Force Research Laboratory (AFRL), is one of
eight Americans selected for a two-year assignment abroad in top-rated centers of applied
sciences research, Air Force officials announced
recently.
Inside:
MS Graduates......2
PhD Graduates....4
Seminar................4
Publications 2001
Pierson is one of the scientists and engineers
selected every other year to participate in the
international Engineering and Scientist Exchange Program (ESEP), sponsored by the Air
Force Office of Scientific Research. Half of the
group are civilians, and half are members of
the armed forces.
“Xbox was a very fun project,” Riegelsberger
says of his part in the development of Nvidia
components for Microsoft’s popular new gaming console, “because what we had to design
was simply the most powerful audio engine
yet for gaming.”
Introduced last November, Xbox competes
against such well-known gaming consoles as
the Sony Playstation and Nintendo’s
GameCube. Some of the same technology in
the Xbox is also available in PCs through
Nvidia “nForce” core-logic products on certain AMD motherboards.
As an audio architect with Nvidia in Santa
Clara, CA, the 34-year-old Ohio State graduate (BS, 1990; MS, 1992 and PhD, 1997) is
engaged in specifying and designing audio
hardware for Nvidia’s semiconductor products.
Although he doesn’t write RTL (register transfer language), he helps identify and develop
Riegelsberger, continued page 3
Pierson will be assigned to Totalförsvarets
Forskningsinstitut (FOI), an arm of the Swedish defense ministry and acclaimed as one of
Europe’s top-rated applied sciences research
centers.
FOI is located in Linköping, a university city,
culture center and key commercial site located
about three hours southwest of Stockholm.
The city is home to SAAB automobile manufacturing facilities and to about 134,000 inAir Force Taps, continued page 2
Edward Riegelsberger
2
Air F
or
ce Taps, continued fr
om page 1
For
orce
from
Four IPSters Receive
Master’s Degrees
Anurag Jain
Dushyanth Krishnamurthy
Marie-Hélène Bourlès
David Hamon
Four IPS students were conferred the degree of Master of Science during Autumn
and Winter Quarters.
Anurag JJain,
ain, a native of Mumbai, India,
defended his thesis, “Array Response Design.” Anurag will be continuing studies
in Computer and Information Science at
Ohio State University.
D ushyanth Krishnamur
Krishnamurtt h yy, from
Chennai, India, completed his thesis,
“Self-Calibration Techniques for Acoustic
Sensor Arrays.” Dushyanth now resides
in Boston, MA.
Two MS graduates of Ecole Supérieure
d’Electricité, Paris, complete second MS
degrees at Ohio State. M arie-Hélène
Bourlès, a native of Brest, France, defended her thesis, “Adaptive Space-Time
amon, a native of
Parsing.” D avid H
Hamon,
Angers, France, completed his thesis, “On
the User Capacity of Turbo Multi-User
Detectors.” Both Marie-Hélène and
David are now residing in France.
Let IPS-o Facto Share
Your News, Comments
News or comments to share? Send email
to ipsofacto@ee.eng.ohio-state.edu.
habitants, including several sizeable ethnic minority groups.
ward to many side-trips in Europe and
other seasonal leisure activities in Sweden.
The institute is involved in the entire field
of applied sciences from advanced computer modeling, physics, aerodynamics,
electronics, to chemistry, microbiology,
medicine, security policy and defense
analysis. However, more than 80 percent
of FOI work assignments are related to
Swedish military applications. Today, the
institute employs 1,200 persons, including 850 college-educated scientists.
In his present position with AFRL, located
at Wright-Patterson Air Force Base, Dayton, Pierson feels he is “on the cutting edge
of what is being done in my field of research.” As a project engineer, he conducts
research in pattern recognition. As a part
of his obligation under the Air Force Palace Knight Program, which completely
funded his graduate education, Pierson
was committed to devote a period of years
as a member of the AFRL staff.
Current plans call for Pierson to be engaged in research related to Very High Frequency (VHF) band Synthetic Aperture
Radar (SAR) which penetrates foliage.
Although several applications of this type
of radar now exist, Pierson will be researching military applications.
“Although Sweden does not have research
funds comparable to the U.S.,” Pierson
notes, “they do a superb job with what
they do study. I have been very impressed
with their understanding of this area; however, they apparently do not have as much
experience in exploiting the information
that can be gleaned from such signals. I
imagine most of my work will be in this
area.”
Confessing to normal anxiety in readying
a plethora of personal logistical affairs required to establish a household in a foreign country, Pierson also eagerly anticipates his exchange program experience will
be an exciting opportunity for both career
development and, especially, for experiencing research from a different perspective.
“Personally, what I want to experience
most is to learn about another culture in a
way that can’t be written down in a social
studies text,” he said.
Pierson expects to complete his six-month
Swedish language training in July, and after a week’s vacation, he and his wife, Jennifer, will depart for Sweden. While in
Linköping during the next two years, he
also hopes to do some adjunct teaching at
a university in the area, continuing the experience of adjunct teaching which he has
enjoyed at the University of Dayton. In
his spare time, he and his wife look for-
During 2000, AFRL tapped Pierson and
other members of his team for the Samuel
M. Burka Memorial Award, given in recognition of their work on AFRL’s biggest
technical achievement of the year. The
outstanding team performance was in the
area of SAR target recognition research.
Hanes Named Chair of
Digital Comm Program
Mar
kH
anes (MS’91) was named Program
ark
Hanes
Chair for the new Digital Communications major at Franklin University, university officials announced in January. In his
new position, Mark is responsible for curriculum development, faculty administration, and support for the new degree program at the Columbus, OH campus.
In addition to responsibilities for the new
program, Mark continues in the department of Computer Science and is responsible for most aspects of web-related
courses at Franklin. Mark is focusing on
web-related course work such as web applications programming, client-server and
Java programming.
Hanes, a former Member of Technical Staff
at AT&T Bell Laboratories and 1989
graduate of Clemson University (summa
cum laude), received the MS degree in electrical engineering from Ohio State University in 1991. Prior to joining the fulltime staff at Franklin University, Mark was
engineering manager at Ecrio, Inc.,
Columbus, OH and was software architect in the Web Architecture Group, Qwest
Communications, Dublin, OH.
3
Riegelsberger
om page 1
Riegelsberger,, continued fr
from
the algorithms.
“Much of the challenge in architecture,” he explains, “is in determining
what should be made. This requires an
understanding of the market, the competition, and general trends, as well as
the capabilities of the technology. Actually doing the design is the easy
part—and fun!”
Before joining Nvidia about two years
ago, Riegelsberger served as a Digital
Signal Processing (DSP) Engineer, and
later as DSP Engineering Manager, at
Aureal Semiconductor. There he participated in “ground-breaking work in
real-time reflection rendering for PC
gaming.” He developed underlying software and hardware technology for realtime rendering which was exposed by
the API (audio application programming interface), taking a game’s graphics geometry and calculating first and
second order reflection for all sound
sources in the simulation.
The API software interface designed by
Aureal permits the application programmer to access an underlying piece of
hardware or software in a clean and easy
way. Reflections refer to sounds that
reach a listener after bouncing off another surface or surfaces. A “direct path”
sound reaches directly from the source
to the listener; a “first order” reflection
reaches the listener after bouncing off
a single surface, and the designation of
higher “orders” progresses according to
the number of surfaces from which the
sound bounces.
The resulting Aureal hardware rendered
reflections in real-time along with the
standard 3D audio source.
Riegelsberger filed for two patents, one
related to reflection rendering, and the
other to 3D audio presentation over
four speakers.
“One thing that I learned at Aureal,”
Ed notes, “was that having the greatest
products is not always enough.”
Although two of Aureal’s audio chips
were successful in the marketplace, he
explained, business missteps and the ex-
pense of successfully defending a patent infringement lawsuit took their financial toll
and contributed to Aureal’s eventual demise.
In his present role as an Audio Architect at
Nvidia, Ed enjoys the rewarding thrill of “designing powerful, cutting-edge products and
seeing your designs made into real products
used by thousands.” Encountering the challenge of a difficult technical problem that
must be solved is “always a highlight,” he
adds.
“I am still very much in a learning mode,”
the Avon Lake, Ohio native concludes, “acquiring as much experience as I can in audio, multimedia, and the semiconductor industry. I intend to stay technical, but I see
myself taking more and more project leadership roles.”
Long-term, Riegelsberger hopes to work with
human-computer interfaces and virtual reality. In the near future, he would like to participate in related ground-breaking product
development in these areas which he expects
to bloom in the near future.
“Being at OSU was all about experiences and
working with good people,” Ed continued.
“Besides the obvious coursework and research
experience, having the opportunity to teach
was a good thing for me. I also benefited from
interactions with faculty and fellow graduate
students, especially via IPS meetings.”
“Choose your research topics carefully!” is the
advice Riegelsberger offers current EE graduate students. And when it comes to selecting
new staff members for his project team, he cites
technical competence as “an obvious requirement,” but also “highlights strong programming
skills and an understanding of computers and
computer architecture.” Intellectual honesty,
self-motivation, assertiveness and passion for the
work are also highly-prized qualities in any colleague, he says.
Mike Fitz Joins UCLA
Michael P
itz, Associate Professor of
P.. F
Fitz,
Electrical Engineering, has accepted a professorship at UCLA effective January. A
1989 Ph.D. graduate of USC, Mike returned to southern California for the vibrant local communications industry and
the academic resources for high-technology education.
Professor Fitz received the B.E.E. degree
(summa cum laude) from the University
of Dayton, Ohio, in 1983. He was both
a Hughes Fellow and TRW Doctoral Fellow during his graduate studies at USC.
In 1989 he accepted an assistant professorship at Purdue University. From 19962001 Dr. Fitz was an Associate Professor
at OSU.
Prof. Fitz’s research is in the broad area of
statistical communication theory, with
emphasis on physical layer communications theory for mobile wireless communications. This effort focuses on coding,
demodulation, synchronization, and
equalization techniques optimized for
mobile or vehicular digital communications. He has authored over 100 journal
and conference papers and has developed
graduate courses on these topics. Professor Fitz’s research group has developed a
high performance narrowband wireless
modem to support this work.
Prof. Fitz was awarded the 2001 IEEE
Communications Society Leonard G.
Abraham Prize Paper Award and is a member of the editorial board of the IEEE
Transactions on Communications.
Riegelsberger is married to the former
Whitney Baker, who received a BA in Sociology at OSU. In addition to home duties
and being mother to Erin, 8; Reid, 6, and
Elise, 2, Whitney also teaches piano to about
20 students and often joins Ed at his hobbies of tennis and bicycling.
Editor’s note: this is the fourth in a series of
IPS alumni profiles.
Michael Fitz
4
Two PhD’s Awarded
Dr. Yahya Mohasseb Dr. Xiaoxia Zhang
Dr. Yahya M
ohasseb was awarded the PhD in Wi02 for his dissertation, “Interference
Mohasseb
Cancellation and Channel Modeling for Space-Time Wireless Radio Systems.” Yahya received the BS and MSc degrees in electrical engineering from the Military Technical College, Cairo, Egypt in 1991 and 1996. Dr. Mohasseb and his family have returned to Egypt,
where Yahya is now on the faculty of the Military Technical College.
Dr. Xiao
xia Zhang was awarded the PhD in Wi02 for her dissertation, “On the Design of
Xiaoxia
Multiple Antenna Systems with Continuous Phase Modulation.” Xiaoxia received the BS
and MS degrees from the University of Science and Technology of China. Dr. Zhang
joined Qualcomm, San Diego, California, in May.
Seminar Series Hosts Distinguished
Visitors from Japan, Canada, U.S.
The 2001-2002 IPS Seminar Series was a research forum for distinguished visiting speakers and IPS graduate students.
Visiting speakers from industry addressed automated vehicles, highdefinition television, blind source separation and distributed deadayuki Tsugawa
tection: Dr. SSadayuki
sugawa, ITS Research Group, National
Institute of Advanced Industrial Science and Technology, Japan,
“Cooperative Driving and Inter-Vehicle Communications”; Dr.
Azz
edine Touzni
zzedine
ouzni, Nxtwave Communications, Inc., Langhorne,
PA, “On the Design of Enhanced VSB Receivers for HDTV”;
Dr. M
ar
cel JJoho
oho
Mar
arcel
oho, Phonak, Inc., Urbana, IL, “Joint Diagonalizamr
tion Methods in Blind Source Separation”; Dr. E
Emr
mree E
Errtin
tin, Battelle
Memorial Institute, Columbus, OH, “Smart Sensor Systems and
Distributed Sequential Detection.” Visiting speakers from academia
spoke on space-time codes, medical image analysis, and channel
ohamed O
ussama D
amen
estimation: Dr. M
Mohamed
Oussama
Damen
amen, University of Alberta,
“Space-Time Coding using Rotated Constellations”; Dr. Yoram
Bresler
esler, University of Illinois, “Statistical Shape Estimation in Inverse Problems”; Dr. Lang Tong
ong, Cornell University, “Pilot Assisted Transmission over Wireless Channels.”
A complete seminar schedule and abstracts are available on-line at
eewww.eng.ohio-state.edu/ips
Internet access to IPS is available at http://eewww.eng.ohio-state.edu/ips
Facto
acto
IPS-o F
Engineering
ngineering
Electrical
lectrical E
epartment
tment of E
Depar
epar
The D
Laboratoryy
Drreese Laborator
205 D
Avvenue
Neil
eil A
2015 N
Columbus, OH 43210-1272
E-mail: ipsofacto@ee.eng.o hio-state.edu
14450-017000-61801
5
Publications 2001
In Print
In Review
H. C. Chiang, Randolph Moses and Lee C. Potter, “ModelBased Bayesian Feature Matching with Application to Synthetic Aperture Radar Target Recognition,” Pattern Recognition, Special Issue on Data and Information Fusion in Image
Processing and Computer Vision, vol. 34, no. 8, pp. 15391553, August.
W. Chen, Urbashi Mitra and Philip Schniter, “Reduced
Rank Detections Schemes for DS-CDMA Communication Systems,” IEEE Transactions on Communications.
Hesham El Gamal and A. Roger Hammons Jr., “Analyzing
the Turbo Decoder Using the Gaussian Approximation,”
IEEE Transactions on Information Theory, vol. 47, no. 2, 671686, February.
Hesham El Gamal and A. Roger Hammons Jr., “New Approach for Layered Space-Time Coding and Signal Processing,” IEEE Transactions on Information Theory, vol. 47, no. 2,
2321-2334, September.
Youjian Liu, Michael P. Fitz and Oscar Y. Takeshita, “Full
Rate Space-time Turbo Codes,” IEEE Journal on Selected Areas on Communications, vol. 19, no. 5, pp. 969-980, May.
Ashutosh Sabharwal, Urbashi Mitra and Randolph L. Moses,
“MMSE Receivers for Multirate DA-CDMA Systems,” IEEE
Transactions on Communications, vol. 49, no. 12 , pp. 21842197 December.
Philip Schniter and C.R. Johnson, Jr., “Performance Analysis
of Godard-Based Channel Identification,” IEEE Transactions on Signal Processing, vol. 49, no. 9, pp. 1757-1767,
September.
Philip Schniter and L. Tong, “Existence and Performance of
Shalvi-Weinstein Estimators,” IEEE Transactions on Signal
Processing, vol. 49, No. 8, pp. 2031-2041, August.
Naresh Sharma, Hesham El Gamal and Evaggelos Geraniotis,
“Joint Demodulation and Iterative Multi-User Decoding for
SFH/SSMA,” IEEE Transactions on Communications, vol. 49,
no. 8, 1437-1446, August.
Oscar. Y. Takeshita, O. M. Collin, P. C. Massey and D. J.
Costello, Jr., “On the Frame Error Rate of Cancatenated
Turbo-Codes,” IEEE Transactions on Communications, vol.
49, no. 4 pp. 602-608, April.
Randolph L. Moses, Dushyanth Krishnamurthy and Robert Patterson, “A Self-Localization Method for Wireless Sensor Networks,” Eurasip Journal on Applied Signal Processing, Special Issue on Sensor Networks.
Ravikiran Rajagopal and Lee C. Potter, “Multivariate MIMO
FIR Inverses,” IEEE Transactions on Image Processing.
In Press
Ravikiran Rajagopal and Lee C. Potter, “Multi-Channel
Multi-Variate Equalizer Design,” Multidimensional Systems
and Signal Processing.
Ashutosh Sabharwal and Lee C. Potter, “Wald Statistic for
Selection of Nested Nonlinear Models,” IEEE Transactions
on Signal Processing.
Book Chapters
José L. Sancho, William E. Pierson, Aníbal R. FigueirasVidal and Stanley C. Ahalt, “Boundary Methods for Statistical Pattern Classification,” in Recent Advances in Neural
Networks, Chapter 7. Editors: D. Andina, F. Ballesteros.
Ed. International Institute of Informatics and Systemics,
IIS press, pp. 231-259, Illinois, USA, 2001.
Best Paper Award
The 2001 Leonard G. Abraham Award was presented to
Tai-Ann Chen, M.P. Fitz, et al., for “A Space-Time Model
for Frequency Nonselective Rayleigh Fading Channels with
Applications to Space-Time Modems,” IEEE Journal on
Selected Areas of Communications, vol. 18, no. 7, pp. 11751190, July 2000.
A luncheon at Siam Oriental Restaurant was held to congratulate IPS WI02 graduates
6
Conference Proceedings 2001
Defne Aktas and Michael P. Fitz, “Distance
Spectra of Space-time Trellis Coded Modulations,” IEEE International Symposium on
Information Theory, Washington, DC, June.
H. B. Aradhye, J. F. Davis, B. R. Bakshi
and Stanley C. Ahalt, “ART-2 and Multiscale
ART-2 for on-line Process Fault Diagnosis
– Validation via Industrial Case Studies,” 4th
IFAC Workshop on On-Line Fault Detection
and Supervision in the Chemical Process Industries, Jejudo Island, Korea, June.
Ülku Baysal and Randolph L. Moses, “Optimal Array Geometries for Wideband DOA
Estimation,” 2001 Symposium on Battlefield
Acoustics and Seismic Sensing, Laurel, MD,
October.
David Browne and Michael P. Fitz, “Field
Tests to Measure the Space-time Characteristics of Narrowband Wireless Channels in
Multiple-antenna Systems,” ICC 2001,
Helsinki, Finland, June.
Sinan Dogan and Randolph L. Moses,
“Bayesian Point Set Matching of Scattering
Features with Application to Object Recognition,” Defense Applications of Signal Processing (DASP) Workshop, Adelaide, Australia, September.
Xun Du, Honglin Li and Stanley C. Ahalt,
“Content-Based Image Compression,” 2001
SPIE Aerosense Conference: Algorithms for Synthetic Aperture Radar Imagery, Orlando, FL,
April.
Hesham El Gamal and David Hamon, “On
the User Capacity of Turbo Multi-User Detectors,” 39th Annual Allerton Conference,
Urbana, IL, October.
Hesham El Gamal, Michael P. Fitz and
Defne Aktas, “Canonical Space-Time Coding,” 39th Annual Allerton Conference, Urbana, IL, October.
Hesham El Gamal, “On the Design of
Space-Frequency Codes,” WPMC 2001,
Aalborg, Denmark, September.
Hesham El Gamal and Marie-Hélène
Bourlès, “On the Design of Adaptive SpaceTime Codes,” IEEE Information Theory
Workshop, Cairns, Australia, September.
Hesham El Gamal and A. Roger Hammons
Jr., “Algebraic Space-Time Codes for Block
Fading Channels,” IEEE International Symposium on Information Theory, Washington,
DC, June.
Junshui Ma and Stanley C. Ahalt, “Parameter Estimation Algorithms Based On a Physics-based HRR Moving Target Model,” SPIE
Aerosense: Algorithms for Synthetic Aperture
Radar Imagery, Orlando, FL. April.
Hesham El Gamal and A. Roger Hammons
Jr., “Convergence Based Design of Turbo
Codes,” IEEE International Symposium on
Information Theory ,Washington, DC, June.
Junshui Ma, Honglin Li and Stanley C.
Ahalt, “Using Support Vector Machines As
HRR Signature Classifiers,” SPIE Aerosense:
Algorithms for Synthetic Aperture Radar Imagery, Orlando, FL, April.
Hesham El Gamal and A. Roger Hammons
Jr., “New Algebraic Space-Time Codes for
BPSK and QPSK Modulation,” CISS 2001,
Baltimore, MD, March.
I.M. Garrison, R.K. Martin, W.A. Sethares,
B. Hart, W. Chung, J. Balakrishnan, R.A.
Casas, T.J. Endres, M. Larimore, Philip
Schniter and C.R. Johnson, Jr., “DTV
Channel Characterization,” CISS 2001,
Princeton, NJ, March.
Jifeng Geng, Urbashi Mitra and Michael P.
Fitz, “Space-time Block Codes in Multipath
CDMA Systems,” IEEE International Symposium on Information Theory, Washington,
DC, June.
J. Han and Oscar Y. Takeshita, “On the Decoding Structure for Multiple Turbo Codes,”
IEEE International Symposium on Information Theory, Washington DC, June.
Chao He, Jianyu Dong, Yuan F. Zheng and
Stanley C. Ahalt, “Object Tracking Using
the Gabor Wavelet Transforms and the
Golden Section Algorithm,” ICRA2001,
Seoul, Korea, May.
Shengchao Li and Michael P. Fitz, “On Reduced State Equalizers,” Thirty-Fifth
Asilomar Conference on Signals, Systems and
Computers, Pacific Grove, CA, November.
Youjian Liu, Michael P. Fitz and Oscar Y.
Takeshita, “Outage Probability and Spacetime Code Design Criteria for Frequency
Selective Fading Channels with Fractional
Delay,” IEEE International Symposium on Information Theory, Washington, DC, June.
Youjian Liu, Michael P. Fitz and Oscar Y.
Takeshita, “Space-time Codes Performance
Criteria and Design for Frequency Selective
Fading Channel,” ICC 2001, Helsinki, Finland, June.
Yahya Z. Mohasseb, Urbashi Mitra and
Michael P. Fitz, “ Bounding the Performance
of a Narrowband MUD Receiver,”
GLOBECOM 2001, San Antonio, TX,
November.
Yahya Z. Mohasseb and Michael P. Fitz, “A
3D Spatio-temporal Simulation Model for
Wireless Channels,” ICC 2001, Helsinki,
Finland, June.
Randolph L. Moses, Robert Patterson and
Dushyanth Krishnamurthy, “An Auto-Calibration Method for Unattended Ground
Sensors,” 2001 Symposium on Battlefield
Acoustics and Seismic Sensing, Laurel, MD,
October.
Randolph L. Moses, Robert Patterson,
Dushyanth Krishnamurthy, N. Srour and
T. Pham, “Self-Calibration of Unattended
Ground Sensor Networks,” Fifth Annual
Federated Laboratory Symposium on Advanced
Sensors, College Park, MD, March.
Ravi Rajagopal and Lee C. Potter, “MIMO
FIR Equalizers and Orders,” IEEE International Conference on Acoustics, Speech and
Signal Processing, Salt Lake City, UT, May.
Ravi Rajagopal, J. Tangudu and Lee C. Potter, “Polarimetric Imaging For Ultra WideBand Radar,” 5th Annual ARL Federated
Laboratory Symposium, Advanced Sensors
Consortium, College Park, MD, March.
Xiaoxia Zhang and Michael P. Fitz, “Spacetime Code Design with CPM Transmission,” IEEE International Symposium on Information Theory, Washington, DC, June.
Xiaoxia Zhang and Michael P. Fitz, “Soft
Output Diversity Combining for CPM signals Over Space-time Correlated Rayleigh
Fading Channels,” ICC 2001, Helsinki,
Finland, June.