SUNMONTUEWEDTHUFRISAT
Conferences, Lectures, & Seminars
Events for March
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Degrees of Freedom for Mutually Interfering Broadcast Channels
Mon, Mar 02, 2009 @ 11:00 AM - 12:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Inkyu Lee,
Korea UniversityAbstract: In this talk, we present an expression of spatial degrees of
freedom (DOF) for two mutually interfering broadcast channels (IFBC) as
a function of arbitrary numbers of transmit antennas and users. The
lower bound on the DOF is obtained by showing that the zero-forcing
solution suffices to achieve all the DOF. Also, the upper bound which
coincides with the lower bound is shown using Jafar's earlier work. From
the derived result, we observe that disabling receive cooperation of the
MIMO interference channel causes the DOF loss. Additionally, we propose
a linear precoding scheme for the IFBC by extending one designed for
broadcast channels with an aim of maximizing the sum rate performance.
We utilize the fact that the precoding matrices in stationary point
always satisfy the zero-gradient condition. Our result is confirmed
through numerical simulations on the sum rate performance of the
proposed precoding technique.Biography: Inkyu Lee is currently a visiting scholar at USC. Prof. Lee
received the B.S. degree (Hon.) in control and instrumentation
engineering from Seoul National University, Seoul, Korea in 1990, and
the M.S. and Ph.D. degrees in electrical engineering from Stanford
University in 1992 and 1995, respectively. From 1995 to 2001, he was a
Member of Technical Staff at Bell Laboratories, Lucent Technologies,
where he studied high-speed wireless system design. He later worked for
Agere Systems (formerly the Microelectronics Group of Lucent
Technologies), Murray Hill, NJ, as a Distinguished Member of Technical
Staff from 2001 to 2002. In September 2002, he joined the faculty of
Korea University, Seoul, Korea, where he is currently a Professor in the
School of Electrical Engineering. His research interests include digital
communications, signal processing, and coding techniques applied to
wireless systems with an emphasis on MIMO-OFDM. Dr. Lee currently serves
as an Associate Editor for the IEEE TRANSACTIONS ON COMMUNICATIONS and
the IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS. Also, he has been a
Chief Guest Editor for the IEEE JOURNAL ON SELECTED AREAS IN
COMMUNICATIONS (Special Issue on 4G Wireless Systems).Host: Giuseppe Caire, caire@usc.edu, EEB 528, x07326Location: Hughes Aircraft Electrical Engineering Center (EEB) - 248
Audiences: Everyone Is Invited
Contact: Gerrielyn Ramos
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor. -
The Role of Feedback in Communication
Tue, Mar 03, 2009 @ 01:30 PM - 02:30 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Young-Han Kim,
UC San DiegoAbstract: Many common communication situations are over inherently two-way channels, such as telephone systems, digital subscriber lines (DSL), cellular networks, and the Internet. In fact, even ``point-to-point'' systems, where the end goal is to transfer information in one direction, often give rise to two-way communication scenarios due to the presence of feedback. In such systems, one can receive feedback from the other end of the channel, which can be used to improve the quality of communication. Although feedback is present in many communication systems, and is being used in certain primitive forms as in channel estimation and automatic repeat request (ARQ), the theory behind its use is far from complete.In this talk, we focus on two recent findings in information theory to discuss the role of feedback in communication networks. Our first result characterizes the feedback capacity of nonwhite Gaussian channels, answering a long-standing open problem studied by many researchers, and shows how dramatic performance improvements can be achieved with optimal use of feedback. Our second result proposes an efficient and robust coding method for more realistic systems with noisy feedback. Although this coding method is still at a conceptual level, it brings up a new paradigm of cross-layer design.Based on joint work with Tsachy Weissman and Amos Lapidoth.Biography: Young-Han Kim is an assistant professor in the Department of Electrical and Computer Engineering at the University of California, San Diego. Professor Kim's research primarily focuses on network information theory and the role of feedback in communication networks.
More broadly, he is interested in statistical signal processing and information theory, with applications in communication, control, computation, networking, data compression, and learning.Professor Kim received his B.S. degree with honors in Electrical Engineering from Seoul National University, in 1996, where he was a recipient of the General Electric Foundation Scholarship. After a three-and-half-year stint as a software architect at Tong Yang Systems, Seoul, Korea, working on several industry projects such as developing the communication infrastructure for then newly opening Incheon International Airport, he resumed his graduate studies at Stanford University, and received his Ph.D. degree in Electrical Engineering (M.S. degrees in Statistics and in Electrical Engineering) in 2006. Professor Kim is a recipient of the 2008 NSF Faculty Early Career Development (CAREER) Award. Host: Urbashi Mitra, ubli@usc.edu, EEB 540, x04667
Location: Frank R. Seaver Science Center (SSC) - 319
Audiences: Everyone Is Invited
Contact: Gerrielyn Ramos
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor. -
Third-Generation Conversational Interfaces
Tue, Mar 03, 2009 @ 02:00 PM - 04:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Dr. Giuseppe RiccardiAbstract: Communicating with machines is becoming pervasive to the point we rely entirely on them to find (vital) information over the web, perform on-line (trans)actions and communicate with people speaking different languages. In the last decade we have seen tremendous research and technology advancement in the speech and text based interfaces. We are now faced with the problem of overcoming their limitations and investigate multimodal input, adaptive interfaces, communicative paradigms and tame task complexity. In this talk we discuss new research towards third-generation conversational interfaces.Bio: Prof. Riccardi received his Laurea degree in Electrical Engineering and Master in Information Technology, in 1991, from the University of Padua and CEFRIEL Research Center, respectively. From 1990-1993 he collaborated with Alcatel-Telettra Research Laboratories (Milan, Italy). In 1995 he received his Phd in Electrical Engineering from the Department of Electrical Engineering at the University of Padua, Italy. From 1993-2005, he worked first at AT&T Bell Laboratories and then AT&T Labs-Research where he worked in the Speech and Language Processing Lab. In 2005 he joined the faculty of Engineering at University of Trento (Italy) and is affiliated with the interdisciplinary Department of Information and Communication Technology and Center for Mind/Brain Sciences. He is the founder and director of the Adaptive Multimodal Information and Interfaces (AMI2) Lab.
Prof. Riccardi's research on stochastic finite state machines for speech and language processing has been applied to a wide range of domains for task automation. He and his colleagues designed the state-of-the-art AT&T spoken language system ranked first in the 1994 DARPA ATIS evaluation. He pioneered the speech and language research in spontaneous speech for the well-known "How May I Help You?" research program which led to breakthrough speech services. His research on learning finite state automata and transducers has lead to the creation of the first large scale finite state chain decoding for machine translation (Anuvaad).
Prof. Riccardi has co-authored more than 80 papers and 25 patents in the field of speech processing, speech recognition, understanding and machine translation. His current research interests are language modeling and acquisition, language understanding, spoken/multimodal dialog, affective interfaces, machine learning and machine translation. Prof. Riccardi has received many national and international awards and more recently the Marie Curie Research Excellence grant by the European Commission and 2009 IEEE SPS Best Paper Award. Host: Professor Shrikanth Narayanan
Location: Hughes Aircraft Electrical Engineering Center (EEB) - 248
Audiences: Everyone Is Invited
Contact: Mary Francis
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor. -
Stochastic Network Optimization and the Theory of Network Throughput, Energy, and Delay
Wed, Mar 11, 2009 @ 01:00 PM - 02:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Michael J. Neely,
USCAbstract: This talk has two parts:
(i) We first summarize the landmark results in the theory of stochastic network optimization over the past two decades. This theory treats routing, scheduling, resource allocation, and flow control in general networks, including ad-hoc mobile networks with time-varying topologies and unreliable channels. We consider the history of network capacity and stability theory, as well as our more recent contributions on joint stability and performance optimization. This allows for optimization of time averages of network utilities and costs (such as throughput, fairness, energy, reliability, etc.) subject to general time average constraints. Simple techniques of backpressure, max-weight decision making, and virtual queues can be used to optimize these performance metrics to any degree of accuracy, with an explicit tradeoff in end-to-end average network delay. (ii) We then focus on the delay metric itself by treating a particular network: A multi-user wireless downlink (or uplink). We generalize the Berry-Gallager bound to this multi-user case, establishing a fundamental tradeoff between average power expenditure and average delay. Scheduling to achieve the optimal tradeoff is a problem that is notoriously complex, and the complexity quickly explodes as the number of users is increased beyond 1. Nevertheless, we overcome this complexity explosion through a novel dynamic control policy that aggressively steers drift in desired directions. The policy works with low complexity, is real-time implementable, does not require knowledge of the channel or traffic statistics, and has quick convergence for any number of users.Details of these results can be found in the following references: 1. L. Georgiadis, M. J. Neely, L. Tassiulas, "Resource Allocation and Cross-Layer Control in Wireless Networks," Foundations and Trends in Networking, Vol. 1, no. 1, pp. 1-144, 2006. http://www-rcf.usc.edu/~mjneely/pdf_papers/NOW_stochastic_nets.pdf2. M. J. Neely, "Optimal Energy and Delay Tradeoffs for Multi-User Wireless Downlinks," IEEE Transactions on Information Theory, vol. 53, no. 9, pp. 3095-3113, Sept. 2007. http://www-rcf.usc.edu/~mjneely/pdf_papers/energy-delay-it.pdfBiography: Michael J. Neely received B.S. degrees in both Electrical Engineering and Mathematics from the University of Maryland, College Park, in 1997. He then received a 3 year Department of Defense NDSEG Fellowship for graduate study at the Massachusetts Institute of Technology, where he received an M.S. degree in EECS in 1999 and a Ph.D. in 2003. During the Summer of 2002, he worked as an intern in the Distributed Sensor Networks group at Draper Labs in Cambridge. He is currently an Assistant Professor in the Communication Sciences Institute (CSI), within the Electrical Engineering Department at the University of Southern California. His research interests are in the areas of stochastic network optimization and queueing theory, with applications to wireless, satellite, mobile ad-hoc networks, and switching systems. Michael received the NSF Career award in 2008. He is a member of Tau Beta Pi and Phi Beta Kappa.
Location: Hughes Aircraft Electrical Engineering Center (EEB) - 248
Audiences: Everyone Is Invited
Contact: Gerrielyn Ramos
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor. -
DLS: The Internet History and its Flexible Future
Thu, Mar 12, 2009 @ 03:00 PM - 04:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Distinguished Lecturer: Dr. Leonard KleinrockAbstract:
In this presentation we discuss the history and future of the Internet. The early work on packet switching is traced and then a brief description of the critical events in the growth of the Internet is given. We will present a vision of where the Internet is heading with a focus on the edge where user participation, flexible applications and services, and innovation are appearing. We foresee a network with extreme mobility, ubiquity, personalization, adaptivity, video addiction and surprising applications as yet unimagined.Biography:
Dr. Leonard Kleinrock developed the mathematical theory of packet networks, the technology underpinning the Internet, while a graduate student at MIT. This was in the period 1960-1962, nearly a decade before the birth of the Internet which occurred in his laboratory when his Host computer at UCLA became the first node of the Internet in September 1969. He wrote the first paper and published the first book on the subject; he also directed the transmission of the first message ever to pass over the Internet. He was listed by the Los Angeles Times in 1999 as among the `50 People Who Most Influenced Business This Century'. He was also listed as among the 33 most influential living Americans in the December 2006 Atlantic Monthly. Kleinrock's work was further recognized when he received the 2007 National Medal of Science, the highest honor for achievement in science bestowed by the President of the United States. Leonard Kleinrock received his Ph.D. from MIT in 1963. He has served as a Professor of Computer Science at the University of California, Los Angeles since then, serving as Chairman of the department from 1991-1995. He received his BEE degree from CCNY in 1957 and his MS degree from MIT in 1959. He also received Honorary Doctorates from CCNY in 1997, from the University of Massachusetts, Amherst in 2000, from the University of Bologna in 2005, from Politecnico di Turino in 2005 and from the University of Judaism in 2007. He was the first President and Co-founder of Linkabit Corporation, the company that spawned numerous wireless spinoffs in San Diego. He is Co-founder and Chairman of Nomadix, Inc., a high-technology firm located in Southern California. He is also Founder and Chairman of TTI/Vanguard, an advanced technology forum organization based in Santa Monica, California. He has published approximately 250 papers and authored six books on a wide array of subjects including packet switching networks, packet radio networks, local area networks, broadband networks, gigabit networks, nomadic computing, performance evaluation, and peer-to-peer networks. During his tenure at UCLA, Dr. Kleinrock has supervised the research for 47 Ph.D. students and numerous M.S. students. These former students now form a core group of the world's most advanced networking experts. A number are full professors at leading universities, and many are associated with major research firms in the area of computer-communications. Dr. Kleinrock is a member of the National Academy of Engineering, a member of the American Academy of Arts and Sciences, an IEEE fellow, an ACM fellow, an INFORMS Fellow, an IEC fellow, a Guggenheim fellow and a founding member of the Computer Science and Telecommunications Board of the National Research Council. Among his many honors, he is the recipient of the L.M. Ericsson Prize, the NAE Charles Stark Draper Prize, the Marconi International Fellowship Award, the Okawa Prize, the IEEE Internet Millennium Award, the ORSA Lanchester Prize, the ACM SIGCOMM Award, the NEC Computer and Communcations Award, the Sigma Xi Monie A. Ferst Award, the CCNY Townsend Harris Medal, the CCNY Electrical Engineering Award, the UCLA Outstanding Faculty Member Award, the UCLA Distinguished Teaching Award, the UCLA Faculty Research Lecturer, the INFORMS Presidents Award, the ICC Prize Paper Award, the IEEE Leonard G. Abraham Prize Paper Award and the IEEE Harry M. Goode Award.Lecture: 3:00-4:00PM (SAL 101)
Reception: 4:00-5:00PM (SAL lobby/courtyard)
Location: Henry Salvatori Computer Science Center (SAL) - Auditorium (-101)
Audiences: Everyone Is Invited
Contact: Estela Lopez
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor. -
Joint Source-Channel Coding at the Application Layer
Fri, Mar 13, 2009 @ 11:00 AM - 12:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Ozgun Bursalioglu Yilmaz
PhD. StudentAbstract: The multicasting of an independent and identically distributed
Gaussian source over a binary erasure broadcast channel is considered.
This model applies to a one-to-many transmission scenario in which some
mechanism at the physical layer delivers information packets with losses
represented by erasures, and users are subject to different erasure
probabilities. The reconstruction signal-to-noise ratio (SNR) region
achieved by concatenating a multi-resolution source code with a
broadcast channel code is characterized and four convex optimization
problems corresponding to different performance criteria are solved.
Each problem defines a particular operating point on the dominant face
of the SNR region. Layered joint source-channel codes are constructed
based on the concatenation of embedded scalar quantizers with binary
raptor encoders. The proposed schemes are shown to operate very close to
the theoretical optimum.Biography: Ozgun Bursalioglu Yilmaz is a PhD. student working with Prof.
Caire at Ming Hsieh Department of Electrical Engineering, University of
Southern California (USC) where she was honored with Dean's Graduate
Fellowship and USC Annenberg Graduate Fellowship Awards. Previously she
received M.S. and B.S. degrees from University of California, Riverside
(2006) and Middle East Technical University (METU), Ankara, Turkey
(2004), respectively. Her senior design project was selected for
"Innovative and Robust Design Award" by METU Electrical Engineering
Department. She received best student paper award with her co-authors at
International Conference on Acoustics, Speech and Signal Processing,
Toulouse, France, May 2006.Host: Giuseppe Caire, caire@usc.edu, EEB 528, x07326Location: Hughes Aircraft Electrical Engineering Center (EEB) - 539
Audiences: Everyone Is Invited
Contact: Gerrielyn Ramos
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor. -
Integrated Sys Seminar-Challenges of 10Gb/s Integrated Optoelec. Transceivers (Dr. Analui, Luxtera)
Fri, Mar 13, 2009 @ 02:00 PM - 03:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker - Dr. Behnam Analui (Luxtera)
Location: Hughes Aircraft Electrical Engineering Center (EEB) - 248
Audiences: Everyone Is Invited
Contact: Hossein Hashemi
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor. -
Seminar: Design-for-reliability for scaled electronic technologies: Opportunities and challenges
Wed, Mar 25, 2009 @ 11:00 AM - 12:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Abstract: This talk will motivate design-for-reliability initiatives that anticipate the paradigm shift to error-aware and error-tolerant design of integrated circuits, both of which are required to address the problem of increasing hardware failures in future technology nodes. These concerns are only
exacerbated as we look forward to emerging technology alternatives. Using graphene as an example, I will go on to describe the modeling, simulation, and design advances that we believe are essential to
address the complexity challenges associated with such scaled electronic technologies.Bio: Kartik Mohanram received the B.Tech. degree in electrical engineering from IIT-Bombay in 1998, and the M.S. and Ph.D. degrees in computer engineering from UT-Austin in 2000 and 2003 respectively. He is currently an assistant professor in the department of Electrical and Computer Engineering at Rice University. His primary research interests are in computer engineering and systems, with an emphasis on modeling, simulation, and computer-aided design of integrated circuits. He is a
recipient of the NSF CAREER Award, the ACM/SIGDA Technical Leadership Award, and the A. Richard Newton Graduate Scholarship.Location: Ronald Tutor Hall of Engineering (RTH) - 306
Audiences: Everyone Is Invited
Contact: Annie Yu
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor. -
DLS: Control: The Hidden Thechnology
Wed, Mar 25, 2009 @ 02:00 PM - 03:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Distinguished Lecturer: Dr. Karl AstromAbstract:
Although feedback has been used for hundreds of years the discipline of control emerged in the 1940s. Control being the first systems discipline was a paradigm shift that fitted poorly in structures organized in civil,mechanical, electrical and chemical engineering. The field has developed very rapidly and control systems are now ubiquitous in engineering. The lecture presents some reflections on the dynamic development of the field the driving forces and the achievements. A brief overview of the historical development is given, development of the central ideas will be discussed and important application areas described. The interplay of theory and applications are discussed together with relations to specific engineering disciplines and mathematics, computer science, physics and biology. It is attempted to assess the current status of the field and to speculate about its future development. An explanation of the title will also be given.Biography:
Karl Johan Astrom was educated at The Royal Institute in Stocholm. After working for IBM Research for five years he was appointed Professor of the Chair of Automatic Control at Lund Institute of Technology (LTH)/Lund University where he established a new department. In 1999 he became Emeritus in Lund and part time professor at UCSB. Astrom has broad interests in automatic control including, stochastic control, modeling, system identification, adaptive control,computer control and computer-aided control engineering. He is listed in ISA Highly Cited and he has Erdos number 3. One paper on self-tuning control, co-authored with B. Wittenmark, was selected for the IEEE Book Control Theory: Twenty-five seminal papers 1932-81. He has several patents, one on automatic tuning of PID controllers, held jointly with T. Hagglund, has led to substantial production. Astrom is a member of the Royal Swedish Academy of Engineering Sciences (IVA) and the Royal Swedish Academy of Sciences (KVA). He is a Fellow of IEEE and IFAC, a foreign member of the US National Academy of Engineering, the Russian Academy of Sciences, and the Hungarian Academy of Sciences. Astrom has received many honors among them six honorary doctorates, the 1987 Quazza Medal from IFAC, the 1993 IEEE Medal of Honor and the 2002 Great Gold Medal of the Royal Swedish Academy of Engineering.Lecture: 2:00-3:00PM,
Reception: 3:00-4:00Location: Hedco Petroleum and Chemical Engineering Building (HED) - co Neuroscience Auditorium (HNB 100)
Audiences: Everyone Is Invited
Contact: Estela Lopez
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor. -
Multirate Anypath Routing in Wireless Mesh Networks - Rafael Laufer
Fri, Mar 27, 2009 @ 10:00 AM - 11:00 AM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Abstract: We present a new routing paradigm that generalizes
opportunistic routing in wireless mesh networks. In multirate anypath
routing, each node uses both a set of next hops and a selected
transmission rate to reach a destination. Using this rate, a packet is
broadcast to the nodes in the set and one of them forwards the packet on
to the destination. To date, there is no theory capable of jointly
optimizing both the set of next hops and the transmission rate used by
each node. We bridge this gap by introducing a polynomial-time algorithm
to this problem and provide the proof of its optimality. The proposed
algorithm runs in the same running time as regular shortest-path
algorithms and is therefore suitable for deployment in link-state routing
protocols. We conducted experiments in a 802.11b testbed network, and our
results show that multirate anypath routing performs on average 80% and up
to 6.4 times better than anypath routing with a fixed rate of 11 Mbps. If
the rate is fixed at 1 Mbps instead, performance improves by up to one
order of magnitude.
Short Bio: Rafael Laufer received the B. Sc. (cum laude) and the M.Sc.
degrees in Electrical Engineering from the Federal University of Rio de
Janeiro (UFRJ), Rio de Janeiro, Brazil, in 2003 and 2005, respectively.
During his M.Sc. studies, he received the FAPERJ's "Bolsa Nota 10"
fellowship, awarded to the top two graduate students of Electrical
Engineering. During 2002, he was with Cisco Systems, Inc. as an intern. He
is now working towards the Ph.D. degree in Computer Science at the
University of California, Los Angeles (UCLA) with Prof. Leonard Kleinrock.
Rafael received the Marconi Society's Young Scholar Award in 2008 in
"recognition of outstanding academic achievement and intellectual promise
in the field of communications science." His major research interests are
distributed systems, wireless networking, security, and operating systems.
He is a member of the IEEE Communications Society and a student member of
IEEE.
Host: Bhaskar Krishnamachari bkrishna@usc.eduLocation: Hughes Aircraft Electrical Engineering Center (EEB) - 248
Audiences: Everyone Is Invited
Contact: Shane Goodoff
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor. -
Information Theory Applied to Fiber-Optic Transmission: Limits to Spectral Efficiency of Optical Fib
Fri, Mar 27, 2009 @ 11:00 AM - 12:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Dr. René-Jean Essiambre
Bell Labs, Alcatel-LucentAbstract: Fiber-optic communication systems constitute the backbone of the communication network infrastructure. The main physical elements of the optical paths in these networks are the optical fiber (as the physical medium for transport) and the optical amplifier (to combat signal attenuation). The transmission bandwidth available over each optical path is enormous, on the order of 10 THz. Despite such a large bandwidth being available, there is a tremendous demand to increase the capacity of fiber-optic communication systems by increasing spectral efficiencies to multiple bits/s/Hz while still maintaining transmission distances on the order of a few thousands of kilometers. Achieving such high spectral efficiency requires using signals with multiple levels in phase and/or amplitude, and possibly using both states of polarization. Transmission of such multilevel signals becomes increasingly impacted by the Kerr fiber nonlinearity, a physical phenomenon unique to the 'fiber channel'. The Kerr nonlinearity results in signal distortions that rapidly increase with signal power. The question then arises: how to apply Shannon's information theory to the `fiber channel' and is there a maximum spectral efficiency associated to the Kerr fiber nonlinearity?In this talk, we will describe how we applied Shannon's theory to the `fiber channel' and present the early results in the direction of conservatively estimating the fiber capacity. A spectral efficiency of ~7 bits/s/Hz (in a single polarization) for transmission over 1000 km in an optically-routed network will be shown to be achievable.Biography: René-Jean Essiambre is a Distinguished Member of Technical Staff at Bell Labs, Alcatel-Lucent. He received his doctorate from Université Laval and studied at the University of Rochester before joining Lucent Technologies (now Alcatel-Lucent) in 1997. Dr. Essiambre is contributing to the design of advanced optical transmission systems, especially in relation to the management of fiber nonlinearities. Interests include modulation formats, detection and optimization techniques for the design of optically routed networks to increase capacity, optical transparency and functionality of wavelength-division multiplexed communication systems. He is a recipient of the 2005 Engineering Excellence Award from OSA, where he is a Fellow.Host: Gerhard Kramer, gkramer@usc.edu, EEB 536, x07229Location: Hughes Aircraft Electrical Engineering Center (EEB) - 248
Audiences: Everyone Is Invited
Contact: Gerrielyn Ramos
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor. -
MIMO HSDPA Testbed Measurements
Fri, Mar 27, 2009 @ 12:00 PM - 01:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Dipl.-Ing. Christian MehlführerAbstract: In this presentation, throughput measurement results of High Speed Downlink Packet Access (HSDPA) are shown. After a short overview about HSDPA and the utilization of multiple antennas in this standard, the measurement methodology and measurement setups in alpine and urban environments are explained. In both environments, the 2x2 and 4x4 MIMO systems achieve more than twice and four times the throughput of the SISO system, respectively. Furthermore, the measured data throughput is compared to an "achievable" throughput that is closely related to channel capacity. This comparison reveals an SNR loss of 6-9 dB, leaving room for improvements.Biography: Christian Mehlführer was born in Vienna, Austria, in 1979. In 2004 he received his Dipl.-Ing. degree in electrical engineering from the Vienna University of Technology. Besides his diploma studies he worked part time at Siemens AG where he performed integration tests of GSM carrier units. After finishing his diploma thesis on implementation and real-time testing of space-time block codes, for which he received the Vodafone Förderpreis 2006 (together with Sebastian Caban), he now is member of the Christian Doppler Laboratory for Design Methodology of Signal Processing Algorithms and works towards his doctoral thesis at the same institute. His research interests include experimental investigation of MIMO systems, MIMO HSDPA (High Speed Downlink Packet Access), MIMO WiMAX (802.16), as well as the upcoming LTE (Long Term Evolution of UMTS) system.Host: Andreas Molisch, molisch@usc.edu, EEB 530, x04670
Location: Hughes Aircraft Electrical Engineering Center (EEB) - 248
Audiences: Everyone Is Invited
Contact: Gerrielyn Ramos
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor. -
Dongrui Wu Defense
Fri, Mar 27, 2009 @ 12:30 PM - 02:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Abstract:This research is focused on multi-criteria decision-making (MCDM) under uncertainties, especially linguistic uncertainties. This problem is important because many times linguistic information, in addition to numerical information, is an essential input of decision-making. Linguistic information usually conveys more uncertainty, and it is necessary to incorporate and propagate this uncertainty during the decision-making process because uncertainty means risk.MCDM problems can be classified into two categories: 1) multi-attribute decision-making (MADM), which selects the best alternative(s) from a group of candidates using multiple criteria, and 2) multi-objective decision-making (MODM), which optimizes conflicting objective functions under constraints. Perceptual computer, an architecture for computing with words, is implemented in this dissertation for both categories. For MADM, we consider the most general case that the weights for and the inputs to the criteria are a mixture of numbers, intervals, type-1 fuzzy sets and/or words modeled by interval type-2 fuzzy sets. Novel weighted averages are proposed to aggregate this diverse and uncertain information so that the overall performance of each alternative can be computed and ranked. For MODM, we consider how to represent the dynamics of a process (objective function) by IF-THEN rules and then how to perform reasoning based on these rules, i.e., to compute the objective function for new linguistic inputs. Two approaches for extracting the IF-THEN rules are proposed: 1) linguistic summarization to extract rules from data, and 2) a knowledge mining approach to extract rules through survey. Applications are shown for all approaches proposed in this dissertation.Bio:Dongrui Wu received a B.E in Automatic Control from the University of Science and Technology of China, Hefei, Anhui, P.R. China, in 2003, an M.Eng in Electrical Engineering from the National University of Singapore, Singapore, in 2005, and an MS in Electrical Engineering from the University of Southern California, Los Angeles, CA, in 2008. Currently he is pursuing his Ph.D. in Electrical Engineering at USC. His research interests include computational intelligence, information fusion, machine learning, decision-support systems, signal processing, control theories, and their applications to smart oilfield technologies. Dongrui Wu has more than 20 publications, including a book (co-authored with J. M. Mendel) "Perceptual Computing: Aiding People in Making Subjective Judgments'' by the Wiley-IEEE Press, and a Best Student Paper Award from the 2005 IEEE International Conference on Fuzzy Systems.
Location: Hughes Aircraft Electrical Engineering Center (EEB) - 403
Audiences: Everyone Is Invited
Contact: Gloria Halfacre
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor. -
Integrated Sys Seminar - Photonic ADCs (Dr. George Valley, Aerospace Corp.)
Fri, Mar 27, 2009 @ 02:00 PM - 03:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker : Dr. George Valley, Aerospace Corp.Abstract :This tutorial presents the status of electronic ADCs, basic ADC concepts, classes of photonic ADCs, the role of microwave photonic links, and lessons learned from realizing a high resolution, wide bandwidth time-stretch photonic ADC.
Location: Hughes Aircraft Electrical Engineering Center (EEB) - 248
Audiences: Everyone Is Invited
Contact: Hossein Hashemi
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor. -
Digital Audio and Video Broadcasting Methods
Fri, Mar 27, 2009 @ 02:00 PM - 03:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Dr. Carl-Erik W. Sundberg
Visiting Senior Scientist, DoCoMo Labs USA
cews@docomolabs-usa.comAbstract: In this talk we will give a brief overview of the technology building blocks used in current and future digital audio and video broadcasting standards with emphasis on wireless transmission methods, media source coding, digital modulation and channel coding methods. First we will very briefly talk about the early history of broadcasting and analog TV and AM, FM and SW radio. The emphasis is then on wireless digital broadcasting methods including HDTV. We will briefly cover schemes such as digital terrestrial television broadcasting (ATSC, DVB-T, DVB-H, DMB, ISDB-T) and digital audio broadcasting,(Eureka 147,HD Radio, Hybrid IBOC AM and FM, DMB, DRM, MediaFLO ).
The US terrestrial digital audio broadcasting standard HD Radio will be discussed in some detail, especially the FM in band version. In this context we cover some research areas in coding and modulation for the current version of the HD Radio standard as well as for future potential upgrades and modifications of this standard. This includes areas such as complementary punctured pair convolutional (CPPC) codes with optimized bit placement, List Viterbi Algorithms (LVAs) as well as "Dirty Paper Coding" (DPC) type of precoding methods for simultaneous transmission of analog FM and digital data.
We will also briefly look at complementary methods of audio and video broadcasting such as satellite, cable and fiber transmission and internet streaming. Finally we will discuss the convergence of digital broadcasting with 3G (e.g. Media Broadcast and Multicast Service, MBMS) and 4G cellular technologies as well as speculate about future wireless broadcasting methods.References:
[1] C-E. W. Sundberg et al. "Technical Advances in Digital Audio Radio Broadcasting", Proceedings of the IEEE, Vol. 90, No 8, pp 1303-1333, August 2002.[2] www.ibiquity.com[3] H. C. Papadopoulos and C-E. W. Sundberg, "Precoded Modulo- Precancelling Systems for Simulcasting Analog FM and Digital Data", IEEE Transactions on Communications, pp 1279-1288, August 2008. Also see Conference Proceedings, ICC2005, Seoul, Korea, June 2005.Biography: Carl-Erik W. Sundberg (S'69-M'75-SM'81-F'90-LF'08) was born in Karlskrona, Sweden in 1943 and received the M.S.E.E. and the Dr. of Technology (PhD) Degrees from the University of Lund, Sweden in 1966 and 1975 respectively. During 1966 to 1975 he held various research and teaching positions at Lund University. In 1968 he served in the Swedish Navy. During 1976 he was an ESA Research Fellow at the European Space Research and Technology Centre (ESTEC), Noordwijk, The Netherlands. From 1977 to 1984 he was a Research Professor (Docent) in the department of Telecommunication Theory, University of Lund, Sweden. From 1981 to 2000 he was a Distinguished Member of Technical Staff (DMTS) at Bell Laboratories, Murray Hill, New Jersey, USA and during 2001 he was a DMTS at Agere Systems Research, Murray Hill, New Jersey, USA. He retired from Bell Labs/Agere in December 2001. Since 2002 he is President and Chief Scientist at SundComm, Sunnyvale, California, USA. During 2002 he was a Consultant at iBiquity Digital Corp., Warren, NJ, USA. During part of 2003, 2004 and 2005 he was a Visiting Professor at Korea University, Seoul, Korea. Since 2006 he is a Visiting Senior Scientist at DoCoMo Labs, Palo Alto, California. He has published over 110 journal papers and contributed over 150 conference papers. Dr. Sundberg has over 120 US and international patents. Among his scientific and technical contributions that have found real world applications can be mentioned constant amplitude modulation CPM for 2G GSM cellular, Circular Viterbi Tailbiting Decoding for 2G TDMA cellular, CPPC codes for US HD Radio FM, Multi-streaming for US HD Radio AM and Joint Program Audio Coding for US Digital Satellite Radio. Dr. Sundberg is a coauthor of Digital Phase Modulation, (New York: Plenum, 1986), Topics in Coding Theory, (New York: Springer-Verlag, 1989) and Source-Matched Digital Communications (New York: IEEE Press, 1996). In 1986 he and his coauthor received the IEEE Vehicular Technology Society's Paper of the Year Award and in 1989 he and his coauthors were awarded the Marconi Premium Proc. IEE Best Paper Award. Two of his papers were selected for inclusion in the IEEE Communications Society 50th Anniversary Journal Collection in 2002 consisting of the 50 (actually 56) most influential papers published by IEEE Communications Society during its first 50 years (The Best of the Best, IEEE Press/Wiley 2007). He has been guest editor for IEEE Journal on Special Areas in Communications 1988-1989 (Coded Modulation) and 2004-2006 (4G Wireless). He is a Fellow of the IEEE since 1990 and is listed in Marquis Who's Who in America.Host: Giuseppe Caire, caire@usc.edu, EEB 528, x07326
Location: Frank R. Seaver Science Center (SSC) - 319
Audiences: Everyone Is Invited
Contact: Gerrielyn Ramos
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor. -
MOBILE IMAGE MATCHING - TOWARDS MOBILE AUGMENTED REALITY
Fri, Mar 27, 2009 @ 04:00 PM - 05:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Professor Bernd Girod,
Department of Electrical Engineering
Stanford UniversityAbstract: Hand held mobile devices, such as camera phones or PDAs, are expected to become ubiquitous platforms for visual search and mobile augmented reality applications. For mobile image matching, a visual database is typically stored at a server in the network. Hence, for a visual comparison, information must be either uploaded from the mobile to the server, or downloaded from the server to the mobile. With relatively slow wireless links, the response time of the system critically depends on how much information must be transferred. We review recent advances in mobile matching, using a "bag-of-visual-words" approach with robust feature descriptors, and show that dramatic speed-ups are possible by considering recognition and compression jointly. Real-time implementations of different applications, such as recognition of landmarks or CD covers, demonstrate the relative advantages of image processing on the phone, the server, and/or both.Biography: Bernd Girod is Professor of Electrical Engineering and (by courtesy) Computer Science in the Information Systems Laboratory of Stanford University, California. He was Chaired Professor of Telecommunications in the Electrical Engineering Department of the University of Erlangen-Nuremberg until 1999. His research interests are in the areas of video compression, networked media systems, and image databases. He has published over 400 conference and journal papers, as well as 5 books. Professor Girod has been involved in several startup ventures, among them Polycom (Nasdaq:PLCM), Vivo Software, 8x8 (Nasdaq: EGHT),and RealNetworks (Nasdaq: RNWK). He received the Engineering Doctorate from University of Hannover, Germany, and an M.S. Degree from Georgia Institute of Technology. Prof. Girod is a Fellow of the IEEE and of EURASIP and a member of the German National Academy of Sciences. He received the 2002 EURASIP Best Paper Award, the 2004 EURASIP Technical Achievement Award, and the 2007 IEEE Multimedia Communication Best Paper Award.Host: Professor Antonio OrtegaLocation: Hughes Aircraft Electrical Engineering Center (EEB) - 248
Audiences: Everyone Is Invited
Contact: Talyia Veal
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor. -
Delay-Limited Cooperative Communication with Reliability Constraints in Wireless Networks
Tue, Mar 31, 2009 @ 02:00 PM - 03:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Rahul Urgaonkar
USC PhD. StudentAbstract: We investigate optimal resource allocation for delay-limited cooperative communication in mobile ad-hoc networks. Motivated by real-time applications that have stringent delay constraints, we develop dynamic cooperation strategies that make optimal use of network resources to achieve a target outage probability (reliability) for each user subject to average power constraints. Using the technique of Lyapunov optimization, we first present a general framework to solve this problem and then derive quasi-closed form solutions for several cooperative protocols proposed in the literature (such as Amplify-and-Forward, Decode-and-Forward, etc.). Our work is the first to treat the problem of delay-limited cooperative communication with reliability constraints in a stochastic network characterized by fading channels, node mobility, and random packet arrivals, where opportunistic cooperation decisions are required.Biography: Rahul Urgaonkar obtained the B.Tech. degree in Electrical Engineering from the Indian Institute of Technology (IIT) Bombay in 2002 and the M.S. degree in Electrical Engineering from the University of Southern California, Los Angeles in 2005. He is currently a PhD student in Electrical Engineering at USC. His research interests are in the areas of stochastic network optimization, resource allocation, and scheduling in next generation Wireless Networks.Relevant papers: R. Urgaonkar and M. J. Neely, "Delay-limited Cooperative Communication with Reliability Constraints in Wireless Networks," IEEE INFOCOM, Mini-conference, Rio de Janeiro, Brazil, April 2009Link: http://www-scf.usc.edu/~urgaonka/papers/coop_comm_infocom09.pdfHost: Michael Neely, mjneely@usc.edu, EEB 520, x03505Location: Hughes Aircraft Electrical Engineering Center (EEB) - 539
Audiences: Everyone Is Invited
Contact: Gerrielyn Ramos
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor.
