Conferences, Lectures, & Seminars
Events for October
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Using Feedback to Increase Information About Quantum States
Wed, Oct 12, 2005 @ 03:00 PM - 04:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Dr. Kurt Jacobs, Griffith UniversityAbstract: We consider using feedback control to increase the rate at which a continuous measurement extracts information about a quantum system. We show that there is a purely quantum effect which may be exploited to this end, as well as an essentially classical algorithm which involves directing the system to states which are well-distinguished by the measurement.Bio: Kurt Jacobs completed his masters degree under Dan Walls at the university of Auckland in 1995, and his PhD under Peter Knight at Imperial College in 1998. From there he went to Los Alamos National Laboratory where he spect three years as a postdoctoral research associate with Salman Habib. After that he worked in Paris for a year at a small supercomputing company doing numerical finance, and for the last 2 and half years has been a research fellow at the Griffith University, at the Center for Quantum Computer Technology, with Howard Wiseman. He is about to take up another postdoctoral position with Jonathan Dowling at LSU in Baton Rouge.Host: Professor Todd A. Brun, tbrun@usc.edu
Location: Hughes Aircraft Electrical Engineering Center (EEB) - -248
Audiences: Everyone Is Invited
Contact: Mayumi Thrasher
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. -
Stability Optimal Resource Allocation in Gaussian MIMO-BC: Theory and Practical Approaches
Tue, Oct 18, 2005 @ 11:00 AM - 12:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Dr. Mari Kobayashi, Technical University of CatalunyaAbstract: In this talk, we address the resource allocation problem in the Gaussian MIMO broadcast channels (BC) where transmission buffer queues destined to each user are located in the transmitter.Under the random packet arrival assumption, stabilizing the transmission buffers is the single most important criterion for "fairness''. We review the well-known results on MIMO-BC and MIMO-Multiple Access Channel (MAC), stability region, and an adaptive policy achieving the largest stability policy (referred to "max-stability policy"). In the first part, we assume perfect channel state information at transmitter (CSIT). We propose a simple iterative waterfilling algorithm to implement the max-stability policy based on the capacity achieving dirty-paper coding (DPC). As a more practical signaling strategy, we consider linear beamforming because it can be generalized to the non-perfect CSIT case. The comparison in terms of average delay shows that the linear beamforming scheme achieves near DPC performance especially for the case of two transmit antennas.In the second part, we shift to more realistic scenario where CSIT is assumed non-perfect due to the fact that the channels are time-varying and the feedback link is delayed. Under non-perfect CSIT, the rate allocation should take into account the outage event, i.e. the event that the transmission rate is above the rate supported by the channel. We compare two schemes based on linear beamforming with different types of CSI feedback : a novel linear beamforming scheme with "analog feedback" and improved opportunistic beamforming with SNR feedback. In "analog feedback", each user sends back its estimated channel vector without quantizing and coding.It is found that the proposed linear beamforming scheme outperforms improved opportunistic beamforming for any channel Doppler bandwidth with a similar amount of feedback. Specifically, for moderate to fast fading channels, the proposed linear beamforming scheme tends to allocate the whole power to one user by operating in a TDMA mode while improved opportunistic beamforming becomes strongly interference-limited and thus unstable.Bio: Mari Kobayashi received the B.E. degree in electrical engineering from Keio University, Yokohama, Japan, in 1999, the M.S. degree in Radio Communications, and the Ph.D. from Ecole Nationale Supérieure des Télécommunications, Paris, France, respectively in 2000 and 2005. Her current research interests include space-time coding, multiuser communication theory.Host: Dr. Giuseppe Caire, x.04683, caire@usc.edu
Location: Hughes Aircraft Electrical Engineering Center (EEB) - -539
Audiences: Everyone Is Invited
Contact: Mayumi Thrasher
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 DIGITAL ALLPASS FILTER: A VERSATILE SIGNAL PROCESSING BUILDING BLOCK
Thu, Oct 20, 2005 @ 10:30 AM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Sanjit K. Mitra
Department of Electrical & Computer Engineering
University of California, Santa Barbara, CaliforniaAbstract:
The digital allpass filter is a computationally efficient signal
processing building block which is quite useful in many signal
processing applications. In this talk we review the properties of
digital allpass filters, and provide a broad overview of the diversity
of applications in digital filtering such as notch filtering, low
sensitivity digital filter implementation, tunable filter design,
complementary filtering and filter banks, multirate filtering, digital
audio, image zooming, etc.Location: Hughes Aircraft Electrical Engineering Center (EEB) - 248
Audiences: Everyone Is Invited
Contact: Alma Hernandez
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. -
POWER-AND RELIABILITY-AWARE DESIGN: CHALLENGES AND OPPORTUNITIES
Thu, Oct 20, 2005 @ 02:00 PM - 03:00 AM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
DISTINGUISHED LECTURER SERIES"Power-and Reliability-Aware Design: Challenges and Opportunities"Dr. Pradip BoseIBM T.J. Watson Research CenterAbstract:The problem of escalating power dissipation at the processor, chip and system levels is quite well known. Thermal hot spots and resulting lifetime reliability concerns have also been highlighted in recent publications and talks. The problem of soft errors (which is not always a byproduct of the thermal problem) is also a hot topic of discussion within the microprocessor R&D community. In this particular talk, I will review some of those challenges from the perspective of early-stage microarchitecture and system design, and point to a range of solution approaches that are currently on the horizon. As part of my talk, I will also try to highlight some of the open research problems and issues that we need help with from the academic research community. One of the themes that I would like to touch on, in this context, is that of the formulation of technically sound metrics of evaluation when we strive for efficiency in design, related to the dimensions of power, performance and reliability. The challenge of developing acceptably accurate pre-silicon evaluation models is of course the larger problem that the metrics issue naturally leads into.Bio:Pradip Bose is a Research Staff Member and Manager of the Reliability- and Power-Aware Microarchitecture department at IBM T. J. Watson Research Center, Yorktown Heights, NY. He received his undergraduate engineering degree from I.I.T Kharagpur in India, and his M.S. and Ph.D degrees in electrical and computer engineering from University of Illinois at Urbana-Champaign. He has been with IBM Research since 1983, where he was part of the first super scalar RISC R&D group at the T. J. Watson Research Center. Since then, Pradip has been involved in all the POWER-series microprocessor development projects within IBM. His current research interests are in high performance computer architecture, power- and reliability-aware design and related pre-silicon modeling methodologies. Pradip is active in all the leading architecture conferences, and is currently the editor-in-chief of IEEE Micro magazine.Host: Prof. Timothy Pinkston, x04482 [A reception will follow at 3:00p.m.]
Location: Ethel Percy Andrus Gerontology Center (GER) - ontology Auditorium
Audiences: Everyone Is Invited
Contact: Rosine Sarafian
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. -
Efficiency of Nonequilibrium Plasma for the Enhancement of Ignition and Combustion
Wed, Oct 26, 2005 @ 12:00 PM - 01:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Svetlana Starikovskaia (Moscow Institute of Physics and Technology)
This talk reviews investigations of the detailed spatial and temporal structure of a high-voltage pulsed nanosecond discharge implemented in the form of a fast ionization wave. Distinctive features of this type of discharge include a high propagation velocity (1-10 cm/ns), and good reproducibility of both the discharge parameters and spatial homogeneity over a large gas volume. The time and spatially resolved electric field, electron and excited state concentrations are analyzed on the basis of experimental data within the framework of a unified kinetic approach. The efficiencies of nonequilibrium plasma resulting from pulsed gas discharges, which have potentially important practical applications in ignition and combustion, will be discussed; and examples of experimental data and the results of numerical simulations for the verification of the main concepts will be represented.Location: Olin Hall of Engineering (OHE) - 230
Audiences: Everyone Is Invited
Contact: Ericka Lieberknecht
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. -
Physical Layer Issues in Wireless Networks
Wed, Oct 26, 2005 @ 02:00 PM - 03:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Dr. Saswat Chakrabarti, GS Sanyal School of Telecommunications, Indian Institute of Technology, KharagpurAbstract: Significance and need for newer solutions to problems related to the physical layer of wireless data networks are unfolding with varieties of demands in applications. A brief overview of wireless research at IIT Kharagpur will be followed by outline presentation on three topics, namely a) outage analysis for voice -data integrated services in correlated shadowing, b) frequency synchronization in OFDM based adhoc networks and c) turbo-equalization. Indicative analytical and simulation results will be presented.Bio: Dr. Chakrabarti ranked among the top ten students at the state-level public examinations at 10th as well as 12th Std. He received his Bachelor of Engineering (B.E) in Electronics & Telecommunication Engineering (1984) from Jadavpur University, Kolkata and M.Tech (1986) and PhD (1992) in Electronics & Electrical Communication Engineering from Indian Institute of Technology Kharagpur, India. Dr. Chakrabarti joined the Dept. of Electronics & Electrical Communications Engineering, IIT Kharagpur as a Lecturer in 1991 and is presently serving as an Associate Professor in the GS Sanyal School of Telecommunications, IIT Kharagpur. He has industrial experience of more than three years including a one-year stint as Asst. General Manager (R&D) at the R&D Division of Himachal Futuristic Communications Ltd. at New Delhi in 1999.Dr. Chakrabarti has taught extensively at undergraduate and graduate levels for about 14 years. The broad area of his research interest has been wireless communications and networks with emphasis on modulation, error control coding, channel modeling and MA issues. He has supervised Ph.D thesis work of two candidates and presently eight Ph.D students are working with him. He has about eight journal papers and more than fifty conference papers to his credit. He has been associated with more than 15 sponsored projects and is a member of IEEE.Host: Urbashi Mitra, ubli@usc.edu
Location: Hughes Aircraft Electrical Engineering Center (EEB) - -248
Audiences: Everyone Is Invited
Contact: Mayumi Thrasher
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. -
Congestion Control in Differentiated Services Networks Using Fuzzy Logic
Fri, Oct 28, 2005 @ 11:00 AM - 12:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
CONTROLS SEMINAR"Congestion Control in Differentiated Services Networks Using Fuzzy Logic"Andreas Pitsillides Associate Professor of Computer ScienceUniversity of CyprusAbstract:Network management and control is a complex problem that requires robust, possibly intelligent, control methodologies to obtain satisfactory performance. Active Queue Management (AQM) mechanisms have been introduced to assist the TCP congestion control. We briefly discuss the modelling and control approach followed by a number of representative AQM schemes, and address possible limitations to meet the diverse needs of today's Internet. Fuzzy Logic Control is adopted due to its reported strength in controlling non-linear systems using linguistic information. Emphasis is given towards the ability of effectively controlling the congestion in TCP/IP networks. The talk will mainly focus on differentiated services. The provision of quality of service (QoS) in a differentiated services (Diff-Serv) environment requires an adequate differentiation between high-priority/assured and low-priority/best-effort classes of service in the presence of congestion, giving priority/preference to assured-tagged traffic. For this purpose, a new active queue management scheme, implemented within the Diff-Serv framework, is presented that provides congestion control in TCP/IP networks using a fuzzy logic control approach. The proposed fuzzy logic approach for congestion control allows the use of linguistic knowledge to capture the dynamics of nonlinear probability marking functions, uses multiple inputs to capture the dynamic state of the network more accurately, and can offer effective implementation. A simulation study over a wide range of traffic conditions - considering multiple bottleneck links - shows that the fuzzy logic based controller outperforms the Random Early Detection (RED) implementation for Diff-Serv in terms of link utilization, packet losses, and queue fluctuations and delays. Also, the proposed scheme can offer better differentiation among assured and best-effort traffic, thus it can provide better QoS to different types of data streams, such as TCP/FTP traffic or TCP/Web-like traffic, whilst maintaining high utilization.Bio:Andreas Pitsillides, Associate Professor of Computer Science, University of Cyprus (UCY), spent 6 years in industry and 18 years in academia (7 with Swinburne University of Technology, Melbourne, Australia). Serves as Chairman of the Cyprus Research and Academic Network (CYNET). Andreas heads the Networks Group. His research interests include fixed and mobile/wireless networks, Internet technologies and their application in Mobile e-Services, especially e-health. He has a particular interest in adapting tools from various fields of applied mathematics such as control theory, and computational intelligence to solve problems in computer networks. Published over 120 referred journal, conference papers and book chapters, participates in numerous EC and locally funded research projects, presented invited lectures at major research organisations, short courses at international conferences and short courses to industry. Regularly serves on international conference executive committees (e.g. INFOCOM 2001-2003, and ICT98), general chair, technical committees, guest co-editor, invited speaker, and as a regular reviewer for conference and journal submissions. Andreas is also a member of the International Federation of Automatic Control (IFAC) Technical Committee (TC) on Networked Systems and the IFIP working group WG 6.3. (http://www.cs.ucy.ac.cy/networksgroup)Host: Prof. Petros Ioannou, x04452
Location: Hughes Aircraft Electrical Engineering Center (EEB) - -248
Audiences: Everyone Is Invited
Contact: Rosine Sarafian
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.
