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Conferences, Lectures, & Seminars
Events for April
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Random Walk with Restart and Its Application to Computer Vision
Mon, Apr 02, 2012 @ 11:00 AM - 12:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Prof. Kyoung Mu Lee, Dept. of EECS, College of Engineering Seoul National University, Korea
Talk Title: Random Walk with Restart and Its Application to Computer Vision
Abstract: In this talk, we introduce the Random Walk with Restart (RWR), and a new generative framework based on RWR for semi-supervised labeling problems in computer vision. Typical semi-supervised labeling problems in computer vision include the seeded image segmentation, photomontage, image coloring, matting and feature matching, and so on, in which the initial seeds or labels are positioned by users. We solve these problems by finding the generative model for each label using RWR in a Bayesian framework. In our new formulation, the generative model is defined by the pixel likelihood of each seed, and it is estimated efficiently by the steady-state probability of RWR. Final solution is obtained by assigning the label with maximum posterior probability to each pixel. We demonstrate the effectiveness of our new framework in some computer vision problems including semi-supervised image segmentation, image colorization, and correspondence problem.
Biography: Kyoung Mu Lee received the B.S. and M.S. Degrees in Control and Instrumentation Eng. from Seoul National University, Seoul, Korea in 1984 and 1986, respectively, and Ph. D. degree in Electrical Engineering from the University of Southern California in 1993. He is currently with the Department of Electrical Engineering and Computer Science at Seoul National University as a professor. His primary research interests include object recognition, MRF optimization, tracking, and visual navigation.
Kyoung Mu Lee had been an editor of the Journal of Applied Signal Processing, and currently serving as an associate editor of the IPSJ Trans. on Computer Vision and Application, Machine Vision and Applications, the Journal of Information Hiding and Multimedia Signal Processing, and IEEE Signal Processing Letters. He has received several awards including Okawa Foundation Research Grant Award in 2006, Honorable Mention Award at the ACCV2007, the Most Influential Paper over the Decade Award at IAPR MVA2009, and the Outstanding Research Award by the College of Engineering of SNU in 2010. He is a Distinguished Lecturer of the Asia-Pacific Signal and Information Processing Association (APSIPA) for 2012-2013. He has (co)authored more than 140 publications in refereed journals and conferences including PAMI, IJCV, CVPR, ICCV and ECCV.
Host: Prof. C.-C. Jay Kuo
Location: 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. -
Sparsity-Promoting Optimal Control of Distributed Systems
Thu, Apr 05, 2012 @ 11:00 AM - 12:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Mihailo Jovanovic, University of Minnesota
Talk Title: Sparsity-Promoting Optimal Control of Distributed Systems
Abstract: This talk is about design of feedback gains that strike a balance between the quadratic performance of distributed systems and the sparsity of the controller. Our approach consists of two steps. First, we identify sparsity patterns of the feedback gains by incorporating sparsity-promoting penalty functions into the optimal control problem, where the added terms penalize the number of communication links in the distributed controller. Second, we optimize the feedback gains subject to the structural constraints determined by the identified sparsity patterns. In the first step, we identify sparsity patterns of the feedback gains using the Alternating Direction Method of Multipliers, which is a powerful algorithm well-suited to large optimization problems. This method alternates between optimizing the sparsity and optimizing the closed-loop performance, which allows us to exploit the structure of the corresponding objective functions. In particular, we take advantage of the separability of the sparsity-promoting penalty functions to decompose the minimization problem into sub-problems that can be solved analytically. In the second step, we develop Newton's method in conjunction with the conjugate gradient scheme to efficiently compute the sparse feedback matrix. Several examples of large dynamic networks are provided to illustrate the effectiveness of the developed approach.
Biography: Mihailo R. Jovanovic (www.umn.edu/~mihailo) received the Dipl. Ing.and M.S. degrees from the University of Belgrade, Serbia, and thePh.D. degree from the University of California, Santa Barbara, in2004. Before joining the University of Minnesota, Minneapolis, he was a Visiting Researcher with the Department of Mechanics, the Royal Institute of Technology, Stockholm, Sweden, from September to December 2004. Currently, he is an Associate Professor of Electrical and Computer Engineering at the University of Minnesota, where he serves as the Director of Graduate Studies in the interdisciplinary Ph.D. program in Control Science and Dynamical Systems. He has held visiting positions with Stanford University and the Institute for Mathematics and Its Applications. Prof. Jovanovic's expertise is in modeling, dynamics, and control of large-scale and distributed systems and his current research focuses on sparsity-promoting optimal control, fundamental limitations in the control of large-scale networks, and dynamics and control of fluid flows. He is a member of IEEE, APS, and SIAM and has served as an Associate Editor of the IEEE Control Systems Society Conference Editorial Board from July 2006 until December 2010. He received a CAREER Award from the National Science Foundation in 2007, and an Early Career Award from the University of Minnesota Initiative for Renewable Energy and the Environment in 2010.
Host: Prof. Urbashi Mitra, ubli@usc.edu, x04667
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. -
Integrated Systems Seminar Series
Fri, Apr 06, 2012 @ 02:30 PM - 04:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Prof. Mona Jarrahi, University of Michigan, Ann Arbor
Talk Title: Pushing the Limits of Terahertz Optoelectronics
Host: Hossein Hashemi
More Information: Seminar_Speaker_Jarrahi_2012_4_6.pdf
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. -
EE-Electrophysics Seminar
Mon, Apr 09, 2012 @ 02:00 PM - 03:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Peter Catrysse, Stanford University, CA
Talk Title: Metal Optics at the Nano-scale for Photonic Devices in Optoelectronic Applications
Abstract: Electromagnetic waves are essential energy and information carriers in our technology-driven society. We use light to see the world, communicate over great distances, and tap into the sun as an unlimited energy source. Manipulation of light is important in all these applications. One of the emerging opportunities in manipulating light is the use of nanostructures. In information technology, it can lead to monolithic integration of photonics and electronics, and to smaller, faster information processing. In image capture technology, it enables more effective control of light inside wavelength-size pixels and can lead to novel optical components that increase imaging system resolution while maintaining efficiency.
In this talk, I present my work on the use of high-index contrast nanostructures to control light at deep-subwavelength scales. First, I describe my theoretical contributions to the basic physics of metal optics at the nano-scale. I demonstrate a conceptual approach for designing novel material systems based on the existence of deep-subwavelength modes in metallic systems. In metamaterials, these modes act as the electromagnetic equivalent of electronic states in conventional materials and they allow unprecedented control over optical properties such as refractive index. In nano-scale aperture geometries, they enable extremely broadband, efficient light transport at optical frequencies. Next, I describe my experimental contributions to the creation of ultra-compact photonic devices in highly-integrated optoelectronic systems. As a demonstration, I employ nano-metallic structures to design wavelength-size photonic devices in solid-state image sensors. Specifically, I implement monolithically-integrated metallic color filters in a standard 180-nm mixed-signal CMOS process. I also show far-field focusing experimentally with planar nano-slit lenses implemented using semiconductor-compatible methods. Finally, I describe how nano-slit lens geometries can give rise to some very unusual optical capabilities as well, including deep-subwavelength (~λ/100) focusing and imaging. With these examples, I illustrate the rich set of opportunities for nano-scale metal optics research at the interface between fundamental physics and integrated optoelectronic systems.
Biography: Dr. Peter B. Catrysse is an Engineering Research Associate in the E. L. Ginzton Laboratory at Stanford University. He holds Ph.D. and M.Sc. degrees in Electrical Engineering from Stanford University. He pioneered the integration of subwavelength metal optics in standard deep-submicron CMOS technology. His current work focuses on nanophotonics at the interface between basic physics and integrated optoelectronic systems for imaging, thin-film photovoltaic, and information processing applications. He has authored more than 85 refereed publications and holds several US patents. Dr. Catrysse is a Brussels Hoover Fellow of the Belgian American Educational Foundation, a Fellow of the Fund for Scientific Research Flanders, a Senior Member of the IEEE, and the recipient of a 2008 Hewlett-Packard Labs Innovation Research Award.
Host: EE-Electrophysics
Location: Hughes Aircraft Electrical Engineering Center (EEB) - 248
Audiences: Everyone Is Invited
Contact: Marilyn Poplawski
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. -
Design for Manufacturability and Reliability in Extreme CMOS Scaling and 3D-IC Integration
Fri, Apr 13, 2012 @ 11:00 AM - 12:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: David Z. Pan, The University of Texas at Austin
Talk Title: Design for Manufacturability and Reliability in Extreme CMOS Scaling and 3D-IC Integration
Abstract: In this talk, I will present some recent research results on design for manufacturability (DFM) and reliability (DFR) in extreme CMOS scaling and 3D-IC integration by my group (www.cerc.utexas.edu/utda). For extreme CMOS scaling beyond 20nm, I will present some recent works CAD for double/multiple patterning lithography and emerging e-beam lithography, as well as lithography hotspot detection using meta-classification. For 3D-ICs, through silicon vias (TSV) cause thermal-mechanical stress, electromigration, and reliability issues. I will discuss some key challenges and issues for reliable 3D-IC integration.
Biography: David Z. Pan is currently an Associate Professor at the Department of Electrical and Computer Engineering, University of Texas at Austin, where he directs the UT Design Automation (UTDA) Lab. He received his Ph.D. in computer science (with honor) from UCLA in 2000. He was a ResearchStaff Member at IBM T. J. Watson Research Center from 2000 to 2003. His research is mainly focused on design for manufacturing/reliability, nanometer physical design, intersection of physical and system-level co-design, and CAD for emerging technologies. He holds 8 U.S. patents and has published over 160 technical papers in premier journals and international conferences. He has served as an Associate Editor for IEEE Transactions on CAD, IEEE Transactions on VLSI, IEEE Transactions on CAS-I, IEEE Transactions on CAS-II, IEEE CAS Society Newsletter, and Journal of Computer Science and Technology. He has served as the IEEE CANDE Committee Chair, ACM/SIGDA Physical Design Technical Committee Chair, program/organizing committee member of major VLSI/CAD conferences, including ASPDAC (Track Chair), DAC (Track Chair), ICCAD (Track Chair), DATE, ISPD (Program/General Chair), ISCAS (CAD Track Chair), VLSI-DAT (EDA Chair), ISQED (Track Chair), ACISC (Program/General Chair), GLSVLSI (Publicity Chair), ISLPED (Design Tools Track Chair), SLIP (Publication Chair), among others. He is a member of the International Technology Roadmap for Semiconductor (ITRS) working group and has served in the Technical Advisory Board of Pyxis Technology Inc. (acquired by Mentor Graphics).
Host: Massoud Pedram
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. -
Integrated Systems Seminar Series
Fri, Apr 13, 2012 @ 02:30 PM - 04:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Prof. Anh-Vu Pham, University of California at Davis
Talk Title: Liquid Crystal Polymer for Microwave and Millimetre-Wave Multi-layer Packages and Modules
Host: Hossein Hashemi
More Information: Seminar_Speaker_Pham_2012_4_13.pdf
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. -
CENG Seminar
Thu, Apr 19, 2012 @ 10:30 AM - 12:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Daniel Limbrick, Ph.D. candidate, Vanderbilt University
Talk Title: âImpact of Logic Synthesis on Soft Error Rate of Digital Integrated Circuitsâ
Abstract: Radiation-induced soft errors are becoming a dominant reliability-failure mechanism in modern CMOS technologies. In nanometer technologies, the effects are not limited to the storage elements of a digital system, but also include vulnerabilities in the combinational logic. Reliability-aware synthesis has emerged as a method to mitigate the effects of soft errors in combinational logic. Few studies have focused on the inherent impact that non-reliability-related synthesis algorithms have on circuit topology, and therefore reliability. My work investigates the impact that area and delay optimizations, computational effort, and standard cell availability have on the error propagation probability of individual circuit nodes. Additionally, I will present circuit characteristics that can be used during synthesis that help in choosing the most reliable circuit implementation. Finally, I will present the broader implications that my findings have on reliability-aware synthesis.
Biography: Mr. Daniel B. Limbrick is currently a Ph.D. candidate in the Department of Electrical Engineering and Computer Science at Vanderbilt University. Mr. Limbrick is a member of the Radiation Effects and Reliability (RER) Group, where his research has been conducted under the advisement of Dr. William H. Robinson. He received a Bachelor of Science degree in Electrical Engineering at Texas A&M University in May 2007 and his Masters of Science degree in the same field at Vanderbilt University in December 2009. His research interests include computer architecture, logic synthesis, and reliability of microelectronics.
Host: Dr. Timothy Pinkston
Location: Hughes Aircraft Electrical Engineering Center (EEB) - 248
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. -
Integrated Systems Seminar Series
Fri, Apr 20, 2012 @ 02:30 PM - 04:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Prof. Vladimir Stojanovic, MIT
Talk Title: Building Modern Integrated Systems: A Cross-cut Approach (The Electrical, Optical and Mechanical)
Host: Hossein Hashemi
More Information: Seminar_Speaker_Stojanovic_2012_4_20.pdf
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. -
Integrated Systems Seminar Series
Fri, Apr 20, 2012 @ 02:30 PM - 04:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Prof. Vladimir Stojanovic, MIT
Talk Title: Building Modern Integrated Systems: A Cross-cut Approach (The Electrical, Optical and Mechanical)
Host: Hossein Hashemi
More Information: Seminar_Speaker_Stojanovic_2012_4_20.pdf
Location: 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. -
Speech Coding and the BroadVoice Speech Codec
Wed, Apr 25, 2012 @ 10:30 AM - 12:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Juin-Hwey (Raymond) Chen, Ph.D., Broadcom Corporation
Talk Title: Speech Coding and the BroadVoice Speech Codec
Abstract: This talk consists of two parts: Part 1 gives a brief introduction to speech coding in preparation for Part 2, which describes the BroadVoice® speech codec that was developed by Broadcom and was included in multiple standards for Voice over IP (VoIP) in cable telephony as standardized by CableLabs, SCTE (Society of Cable Telecommunications Engineers), ANSI, and ITU-T. Speech coding is the science and art of reducing the bit-rate needed to represent speech signals while maintaining a certain level of speech quality under given constraints on coding delay and complexity. Previous medium- to low-bit-rate speech coding standards typically have medium to high coding delay and complexity, and are usually encumbered by royalties. In contrast, the BroadVoice speech codec was designed from the outset to be low-delay, low-complexity, high-quality, and most importantly, free of third-party intellectual properties so it can be freely used by anyone without royalty payments. This talk gives a brief historical overview of the development of BroadVoice and also provides a high-level description of the BroadVoice speech coding algorithm. The BroadVoice family of codecs includes a 16 kb/s BroadVoice16⢠(BV16) narrowband codec and a 32 kb/s BroadVoice32⢠(BV32) wideband codec. Based on a novel two-stage noise feedback coding structure with vector quantization of excitation, BroadVoice achieves a low algorithmic buffering delay of merely 5 ms and codec complexity of only 12 and 17 MIPS for BV16 and BV32, respectively. The speech quality of BV16 is better than that of the ITU-T G.728, G.729, and 32 kb/s G.726 standards, and the speech quality of BV32 is better than that of the 64 kb/s G.722 standard. Audio demonstrations will be played in this talk. Both BV16 and BV32 are not only royalty-free but also open source with both floating-point and fixed-point C source code freely downloadable (www.broadcom.com/broadvoice).
Biography: Juin-Hwey (Raymond) Chen received his B.S.E.E. degree from National Taiwan University in 1980 and his Master and Ph.D. degrees in Electrical Engineering from University of California, Santa Barbara in 1983 and 1987, respectively. He joined Broadcom Corporation in 2000 and is now a Senior Technical Director there. Prior to joining Broadcom, Raymond spent 8 1/2 years at AT&T Bell Labs and AT&T Labs, three years at Voxware, Inc., and one year at Lucent Technologies. His research focus is on compression and quality enhancement of speech and audio signals. He has more than 50 technical publications and is an inventor of 57 issued United States patents and 35 pending U.S. Patents. He is the primary inventor of the ITU-T G.728 speech coding standard and the BV16 and BV32 speech codecs in the PacketCable, SCTE, ANSI, and ITU-T J.161 and J.361 standards. He is also well-known for inventing a postfiltering speech enhancement technique that is used in most international speech coding standards established since 1987. Throughout his career he has invented numerous speech codecs, many of which are widely used commercially. Raymond was elected a Fellow of the IEEE in 1995. He was also elected a Broadcom Fellow in 2006.
Host: Professor Shrikanth Narayanan
Location: Ronald Tutor Hall of Engineering (RTH) - 320
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. -
EE Distinguished Lecturer Series
Wed, Apr 25, 2012 @ 03:00 PM - 04:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Dr. Jelena Kovačević, Director, Center for Bioimage Informatics, Carnegie Mellon University
Talk Title: âProblems in Biological Imaging: Opportunities for Signal Processingâ
Abstract: In recent years, the focus in biological sciences has shifted from understanding single parts of larger systems, a sort of vertical approach, to understanding complex systems at the cellular and molecular levels, a horizontal approach. Thus the revolution of "omics" projects such as genomics and now proteomics. Understanding complexity of biological systems is a task that requires acquisition, analysis and sharing of huge databases, and in particular, high-dimensional databases. Processing such a huge amount of bioimages visually by biologists is inefficient, time-consuming and error-prone. Therefore, we would like to move toward automated, efficient and robust processing of such bioimage data sets. Moreover, some information hidden in the images may not be readily visually available. Thus, we do not only help humans by using sophisticated algorithms for faster and more efficient processing, but also because new knowledge is generated through use of such algorithms.
The ultimate dream is to have distributed yet integrated large bioimage databases which would allow researchers to upload their data, have it processed, share the data, download data as well as platform-optimized code, etc, and all this in a common format. To achieve this goal, we must draw upon a whole host of sophisticated tools from signal processing, machine learning and scientific computing. I will address some of these issues in this presentation, especially those where signal processing expertise can play a significant role.
Biography: Jelena Kovačević received a Ph.D. degree from Columbia University. She then joined Bell Labs, followed by Carnegie Mellon University in 2003, where she is currently a Professor in the Departments of BME and ECE and the Director of the Center for Bioimage Informatics. She received the Belgrade October Prize and the E.I. Jury Award at Columbia University.
She is a coauthor on an SP Society award-winning paper and is a coauthor of the book "Wavelets and Subband Coding." Dr. Kovacevic is the Fellow of the IEEE and was the Editor-in-Chief of the IEEE Transactions on Image Processing. She was a keynote speaker at several meetings and has been involved in organizing numerous conferences. Her research interests include multiresolution techniques and biomedical applications
Host: Dr. Antonio Ortega
More Info: http://ee.usc.edu/news/dls/
Location: John Stauffer Science Lecture Hall (SLH) - 100
Audiences: Everyone Is Invited
Contact: Estela Lopez
Event Link: http://ee.usc.edu/news/dls/
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. -
ISI 40th Anniversary Seminar
Thu, Apr 26, 2012 @ 01:00 PM - 05:00 PM
Thomas Lord Department of Computer Science, Information Sciences Institute, Ming Hsieh Department of Electrical and Computer Engineering, USC Viterbi School of Engineering
Conferences, Lectures, & Seminars
Speaker: Five eminent IT experts, from five distinguished institutions
Talk Title: The USC Information Sciences Institute, From Beginnings to Now
Abstract: George Bekey, How ISI came to USC; Bob Kahn, Internet/networking; Rod Beckstrom, Internet/ICANN; Bert Sutherland, MOSIS creation; Bill Swartout, AI evolution; Herb Schorr, Closing Remarks
Biography: ISI celebrates its 40th birthday this year. This program illustrates its achievements.
Host: Herbert Schorr
More Information: ISI 40th Anniversary Seminar program.pdf
Location: Marina del Rey Hotel, Marina del Rey Hotel, 13534 Bali Way, MdR.
Audiences: Everyone Is Invited
Contact: Eric Mankin
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 Systems Seminar Series
Fri, Apr 27, 2012 @ 02:30 PM - 04:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Prof. Kenneth K. O, University of Texas Dallas
Talk Title: Sub-millimeter Wave CMOS Integrated Circuits and Systems
Host: Hossein Hashemi
More Information: Seminar_Speaker_kenneth O_2012_4_27.pdf
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. -
WiFi-Nano : Reclaiming WiFi Efficiency through 800 ns slots
Mon, Apr 30, 2012 @ 10:00 AM - 12:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Krishna Chintalapudi, Microsoft Research
Talk Title: WiFi-Nano : Reclaiming WiFi Efficiency through 800 ns slots
Abstract: The increase in WiFi physical layer transmission speeds from 1~Mbps to 1 Gbps has reduced transmission times for a 1500 byte packet from 12 ms to 12 us. However, WiFi MAC overheads such as channel access and acks have not seen similar reductions and cumulatively contribute about 150~$\mu s$ on average per packet. Thus, the efficiency of WiFi has deteriorated from over 80% at 1~Mbps to under 10% at 1~Gbps. WiFi-Nano, allows WiFi to to use 800 ns slots to significantly improve WiFi efficiency. Reducing slot time from 9 us to 800 ns makes backoffs efficient, but clear channel assessment can no longer be completed in one slot since preamble detection can now take multiple slots. Instead of waiting for multiple slots for detecting preambles, nodes speculatively transmit preambles as their backoff counters expire, while continuing to detect premables using self-interference cancellation. Upon detection of preambles from other transmitters, nodes simply abort their own preamble transmissions, thereby allowing the earliest transmitter to succeed. Further, receivers speculatively transmit their ack preambles at the end of packet reception, thereby reducing ack overhead. We validate the effectiveness of WiFi-Nano through implementation on an FPGA-based software defined radio platform, and through extensive simulations, demonstrate efficiency gains of up to 100%.
Biography: I am a researcher in the Mobility, Networks, and Systems group at Microsoft Research India. Prior to joining MSR I was a Senior Research Engineer at Bosch Research and Technology Center in Palo Alto, CA, USA. I graduated from University of Southern California with a PhD in Computer Science in 2005. My advisor was Prof. Ramesh Govindan. I obtained my Masters in Electrical Engineering from Drexel Univerity in 1999 and my B.Tech in Electrical Engineering from the Institute of Technology, Banaras Hindu University in 1997. My research interests broadly lie in the area of wireless networking systems. In the past I have worked on various aspects of wireless sensor networks, WiFi, Cognitive and WhiteSpace Networking and indoor localization of mobile devices.
Host: Urbashi Mitra, x0-4667, ubli@usc.edu
Location: Seaver Science Library (SSL) - 150
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.
