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Conferences, Lectures, & Seminars
Events for November
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The MIMO-ARQ channel: optimal diversity-multiplexing-delay tradeoff
Fri, Nov 12, 2004 @ 10:00 AM - 11:00 AM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
SPEAKER: Dr. Giuseppe Caire, Dept of Mobile Communications, Institute EurecomABSTRACT: In this talk, we explore the fundamental performance tradeoff of the delay-limited Multi-Input-Multi-Output (MIMO) Automatic Retransmission reQuest (ARQ) channel. In particular, we extend the diversity-multiplexing tradeoff defined by Zheng and Tse in standard delay-limited MIMO channels with coherent detection to the hybrid ARQ scenario. We establish the three-dimensional tradeoff between reliability (i.e. diversity), throughput (i.e., multiplexing gain), and delay (i.e., maximum retransmission delay). This tradeoff quantifies the ARQ diversity gain obtained by leveraging the retransmission delay to enhance the reliability for a given multiplexing gain. Interestingly, ARQ diversity appears even in long-term static channels where all the retransmissions take place in the same channel state. Then, we show how power control, if possible, can be used to further increase the diversity advantage, for a given multiplexing gain and maximum retransmission delay. Our analysis reveals some important insights on the benefits of ARQ in slow fading MIMO channels. In particular, we show that: 1) allowing for a sufficiently large retransmission delay results in an almost flat diversity-multiplexing tradeoff, and hence, renders operating at high multiplexing gain more advantageous; 2) MIMO ARQ channels quickly approach the no-outage limit when power control is employed. Finally, we complement our information theoretic analysis with an incremental redundancy LAttice Space-Time (LAST) coding scheme which is shown, through a random coding argument, to achieve the optimal tradeoff(s) when used with an MMSE-Lattice decoder. Throughout the paper, our theoretical claims are validated by numerical results.BIO: Giuseppe Caire was born in Torino, Italy, in 1965. He received the B.Sc. in Electrical Engineering from Politecnico di Torino (Italy), in 1990, the M.Sc. in Electrical Engineering from Princeton University in 1992 and the Ph.D. from Politecnico di Torino in 1994. He was a recipient of the AEI G.Someda Scholarship in 1991, has been with the European Space Agency (ESTEC, Noordwijk, The Netherlands) from May 1994 to February 1995, was a recipient of the COTRAO Scholarship in 1996 and of a CNR Scholarship in 1997. He has been visiting Princeton University in summer 1997 and Sydney University in summer 2000.He has been Assistant Professor in Telecommunications at the Politecnico di Torino, Associate Professor at the University of Parma, Italy, and presently he is Professor with the Department of Mobile Communications of the Institute Eurecom, Sophia-Antipolis, France.He served as Associate Editor for the IEEE Transactions on Communications in 1998-2001 and as Associate Editor for the IEEE Transactions on Information Theory in 2001-2003. He received the Jack Neubauer Best System Paper Award from the IEEE Vehicular Technology Society in 2003, and the Joint IT/Comsoc Best Paper Award in 2004.His current interests are in the field of communications theory, information theory and coding theory with particular focus on wireless applications.Host: Dr. P. Vijay Kumar, x.04668, vijayk@usc.edu
Location: Hedco Neurosciences Building (HNB) - 100
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. -
Estimating Capacity of an Interference-limited Cellular Network
Fri, Nov 12, 2004 @ 02:00 PM - 03:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
SPEAKER: Dr. Andrew J. Viterbi, Presidential Chair Professor of EE-Systems and President, Viterbi GroupABSTRACT: As wide area wireless network usage moves from carrying predominantly voice conversations to a significant percentage being devoted to downloading Internet data traffic, including video, the downlink becomes the more important direction. In a heavily loaded network the dominant limiting factor is the interference from users of neighboring cells. Furthermore, the capacity of transmission to a specific user is position dependent. Treating an idealized model of uniformly distributed users over a multi-cell region, we evaluate the downlink capacity in bits/sec/Hz/sector as an upper bound on the performance of any multiple-access technology.BIO: Dr. Andrew Viterbi is a co-founder and retired Vice Chairman and Chief Technical Officer of QUALCOMM Incorporated. He spent equal portions of his career in industry, having previously co-founded Linkabit Corporation, and in academia as Professor in the Schools of Engineering and Applied Science, first at UCLA and then at UCSD, at which he is now Professor Emeritus. He is currently president of the Viterbi Group, a technical advisory and investment company.His principal research contribution, the Viterbi Algorithm, is used in most digital cellular phones and digital satellite receivers, as well as in such diverse fields as magnetic recording, voice recognition and DNA sequence analysis. More recently, he concentrated his efforts on establishing CDMA as the multiple access technology of choice for cellular telephony and wireless data communication. Dr. Viterbi has received numerous honors both in the U.S. and internationally. Among these are five honorary doctorates, from the Universities of Waterloo (Canada), Rome: Tor Vergata and La Sapienza (Italy), Technion (Israel) and Notre Dame, as well as memberships in the National Academy of Engineering, the National Academy of Sciences and the American Academy of Arts and Sciences. He has received the Marconi International Fellowship Award, the IEEE Alexander Graham Bell and Claude Shannon Awards , the NEC C&C Award, the Eduard Rhein Foundation Award and the Christopher Columbus Medal. He has received an honorary title from the President of Italy and he has served on the U.S. President's Information Technology Advisory Committee.Viterbi serves on boards of numerous non-profit institutions, including the University of Southern California, UC President's Council for the National Laboratories, MIT Visiting Committee for Electrical Engineering and Computer Science, Mathematical Sciences Research Institute, Burnham Institute and the Scripps Research Institute. Host: Dr. Solomon Golomb, x.07333
Location: Ethel Percy Andrus Gerontology Center (GER) - ontology Auditorium
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. -
From Thermodynamically-Aware Probabilistic Algorithms to Ultra-Low Energy CMOS Computing Platforms
Tue, Nov 16, 2004 @ 03:00 PM - 04:00 AM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
PROF. KRISHNA PALEM,
Georgia Institute of TechnologyGerontology Auditorium (GER-124)Tuesday, November 16, 20043:00-4:00p.m.(A reception will follow the seminar at 4:00p.m.)Abstract:The energy consumed by computations is a significant concern, especially within the context of embedded systems, on par with the past focus on raw speed or its derivative, performance in the high-performance computing domain. In this talk, we will outline an entirely new approach to energy-aware computing: trading the probability of the BIT being correct for savings in the energy consumed, yielding a probabilistic bit or PBIT (instead of a conventional BIT which is guaranteed to be correct). At its heart, the approach taken here is built on the fundamental and novel thesis that the energy consumed by a computation is proportional to the associated accuracy, characterized as the probability of being correct, with which each "bit'' is computed. With this as background, probabilistic hardware devices---these can be viewed as the "hardware'' counterparts of the well-known probabilistic algorithms---and gates realized from conventional CMOS technology for computing PBITs will be described. Our probabilistic devices are constructed through the counterintuitive approach of using noise, which is increasingly being viewed as a hurdle to sustaining Moore's law, as a resource rather than as an impediment. Specifically, we have demonstrated that coupling thermally induced sources of noise, as well as the prevalent power-supply noise with a conventional CMOS device yields a probabilistic switch, which can in turn be a basis for realizing probabilistic applications in silicon. These probabilistic (hardware) switches compute with a definite probability of error, and have been demonstrated to serve as natural building-blocks in architectures for supporting probabilistic algorithms, yielding significant savings to the (energy x performance) metric in a variety of embedded computing applications ranging over speech and pattern recognition, robotics and others---improvements of over a factor of 100 within the context of an AMI 0.5µm, a TSMC 0.25µm and proprietary deep submicron processes, when compared to executing the same applications on a low energy embedded processor, the StrongARM SA-1100. At a deeper level, all of this work rests on the twin foundations of classical thermodynamics (of Maxwell, Boltzmann and Gibbs), and the relatively modern computational complexity theory. Time permitting, these foundations will be surveyed.Bio:Krishna V. Palem holds Professorships with tenure in Electrical and Computer Engineering and in Computer Science in the College of Computing, a senior research leadership in the College of Engineering, and has been the founding director of the Center for Research in Embedded Systems and Technology (CREST) (www.crest.gatech.edu) at the Georgia Institute of Technology, since 1999. Over the years, he has played an active role in enabling a community of research in embedded and hybrid systems internationally through invited and keynote lectures, conference organization and participation as well as editorial contributions to journals. Among others, he serves on the editorial board of the newly created ACM Transactions on Embedded Computing Systems. Notably, he has chaired bodies whose advise has led to funding initiatives in Embedded and Hybrid Systems by the National Science Foundation in the U.S., as well as by the leading research funding agency A*Star of Singapore. With Guang Gao, he started the Compilers, Architectures and Synthesis for Embedded Systems (CASES) workshop series in 1998. Since then, this workshop has blossomed into a thriving international conference sponsored by ACM SIGs, serving the community as a point of focus for top quality research, driven exclusively by concerns of the embedded computing domain. From 1986 to 1994, Palem was a member of the IBM T. J. Watson research center. During this period, he also served as an Advanced Technology Consultant to IBM's Santa Teresa Laboratory and helped with the transfer of research technology including his own, into compilers for IBM's RS6000 line of processors. He was a Schonbrunn visiting professor at the Hebrew University of Jerusalem, Israel, where he was recognized for excellence in teaching, and has held visiting positions at the National University and Nanyang Technological University, of Singapore. He is a fellow of the IEEE.Host: Prof. Viktor Prasanna, x04483
Location: Ethel Percy Andrus Gerontology Center (GER) - -124
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. -
Quality of Service in Ad-Hoc Networks
Wed, Nov 17, 2004 @ 02:30 PM - 03:30 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
SPEAKER: Mr. Rajarshi Gupta, UC BerkeleyABSTRACT: QoS mechanisms in the routing layer are insufficient, when distributed scheduling in MAC protocols like 802.11 is unfair. We first propose a novel backoff scheme that attains a higher degree of MAC fairness, by favoring congested nodes during scheduling. We prove the stability and optimality of the new scheme using Markov analysis, and use simulations to study its performance in larger random networks as well.We then address the feasibility of a given set of flows on an arbitrary ad-hoc network, by modeling the interference between links as a conflict graph. To provide sufficient conditions for feasibility, we propose clique-based constraints that are computationally simple, and may be evaluated in a distributed fashion.We use the above framework to design QoS routing algorithms for ad-hoc networks, that take interference into account. We demonstrate the efficacy of a distributed ad-hoc shortest widest path algorithm. We further propose IQ Routing - a source-based heuristic mechanism that is able to select QoS routed paths in a dynamic manner, using only localized state information.Bio: Rajarshi Gupta is a PhD candidate in EECS at UC Berkeley, and will graduate in May 2005. Prior to this, he completed his MS in 1999 at Berkeley, and his BS in 1997 at the U. of Maryland. From 1999 to 2003, Rajarshi worked with Extreme Networks as a Senior Designer, where he has been the author of 8 patents. He is interested in algorithms to ensure quality in networks - both wired and ad-hoc. This includes: analysis of network capacity; switching and scheduling mechanisms for efficient utilization of resources; and, routing algorithms to guarantee quality of service.Host: Dr. Michael Neely, mjneely@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. -
Coding: from Information Theory to Hardware
Thu, Nov 18, 2004 @ 09:30 AM - 10:30 AM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
SPEAKER: Dr. Oliver Collins, University of Notre DameABSTRACT: This talk presents new results in both the outer (channel coding) and inner (transmitter hardware) layers of communication systems. The first part of the talk introduces the concept of coding for variable channel coherence. The need for this type of coding arises naturally in the multi-user broadcast channel since the more mobile a terminal, the harder it is for it to maintain coherence. The talk shows that non-coherent users can be accommodated without loss to the overall capacity, as long as there are not too many of them. This argument leads naturally to an efficient (capacity lossless) method of using codes designed for memoryless channels on channels with memory and to new ways of calculating the capacity of fading channels.The second part of the talk explains how a low rate purely digital code labeling a trellis can be used to perform modulation as well as coding. This new approach allows for a completely digital transmitter. There are no analog up-conversion stages required at the transmitter; the binary stream coming out of the modulator is simply filtered and directly radiated. The talk concludes with experimental results, i.e., real RF measurements for GMSK and BPSK and a demonstration of a working prototype.Bio: Oliver M. Collins (Fellow 2002) was born in Washington, DC. He received the B.S. degree in Engineering and Applied Science in 1986, and the M.S. and Ph.D. degrees in Electrical Engineering in 1987 and 1989, all from the California Institute of Technology in Pasadena, CA.From 1989 to 1995 he was an Assistant Professor and later an Associate Professor in the Department of Electrical and Computer Engineering at the Johns Hopkins University in Baltimore, MD. In September 1995 he accepted appointment as Associate professor in the Department of Electrical Engineering of the University of Notre Dame, Notre Dame, IN. He was promoted to full professor in 2001 and teaches courses in Communications, Information Theory, Coding, and Complexity Theory. He received the 1994 Thompson prize paper award from the IEEE, the 1994 Marconi Young Scientist Award from the Marconi Foundation, and the 1998 Judith Resnik Award from the IEEE.Host: Dr. P. Vijay Kumar, vijayk@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. -
Coding: from Information Theory to Hardware
Fri, Nov 19, 2004 @ 09:30 AM - 10:30 AM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
SPEAKER: Dr. Oliver Collins, University of Notre DameABSTRACT: This talk presents new results in both the outer (channel coding) and inner (transmitter hardware) layers of communication systems. The first part of the talk introduces the concept of coding for variable channel coherence. The need for this type of coding arises naturally in the multi-user broadcast channel since the more mobile a terminal, the harder it is for it to maintain coherence. The talk shows that non-coherent users can be accommodated without loss to the overall capacity, as long as there are not too many of them. This argument leads naturally to an efficient (capacity lossless) method of using codes designed for memoryless channels on channels with memory and to new ways of calculating the capacity of fading channels.The second part of the talk explains how a low rate purely digital code labeling a trellis can be used to perform modulation as well as coding. This new approach allows for a completely digital transmitter. There are no analog up-conversion stages required at the transmitter; the binary stream coming out of the modulator is simply filtered and directly radiated. The talk concludes with experimental results, i.e., real RF measurements for GMSK and BPSK and a demonstration of a working prototype.Bio: Oliver M. Collins (Fellow 2002) was born in Washington, DC. He received the B.S. degree in Engineering and Applied Science in 1986, and the M.S. and Ph.D. degrees in Electrical Engineering in 1987 and 1989, all from the California Institute of Technology in Pasadena, CA.From 1989 to 1995 he was an Assistant Professor and later an Associate Professor in the Department of Electrical and Computer Engineering at the Johns Hopkins University in Baltimore, MD. In September 1995 he accepted appointment as Associate professor in the Department of Electrical Engineering of the University of Notre Dame, Notre Dame, IN. He was promoted to full professor in 2001 and teaches courses in Communications, Information Theory, Coding, and Complexity Theory. He received the 1994 Thompson prize paper award from the IEEE, the 1994 Marconi Young Scientist Award from the Marconi Foundation, and the 1998 Judith Resnik Award from the IEEE.Host: Dr. P. Vijay Kumar, vijayk@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. -
Coding: from Information Theory to Hardware
Sat, Nov 20, 2004 @ 09:30 AM - 10:30 AM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
SPEAKER: Dr. Oliver Collins, University of Notre DameABSTRACT: This talk presents new results in both the outer (channel coding) and inner (transmitter hardware) layers of communication systems. The first part of the talk introduces the concept of coding for variable channel coherence. The need for this type of coding arises naturally in the multi-user broadcast channel since the more mobile a terminal, the harder it is for it to maintain coherence. The talk shows that non-coherent users can be accommodated without loss to the overall capacity, as long as there are not too many of them. This argument leads naturally to an efficient (capacity lossless) method of using codes designed for memoryless channels on channels with memory and to new ways of calculating the capacity of fading channels.The second part of the talk explains how a low rate purely digital code labeling a trellis can be used to perform modulation as well as coding. This new approach allows for a completely digital transmitter. There are no analog up-conversion stages required at the transmitter; the binary stream coming out of the modulator is simply filtered and directly radiated. The talk concludes with experimental results, i.e., real RF measurements for GMSK and BPSK and a demonstration of a working prototype.Bio: Oliver M. Collins (Fellow 2002) was born in Washington, DC. He received the B.S. degree in Engineering and Applied Science in 1986, and the M.S. and Ph.D. degrees in Electrical Engineering in 1987 and 1989, all from the California Institute of Technology in Pasadena, CA.From 1989 to 1995 he was an Assistant Professor and later an Associate Professor in the Department of Electrical and Computer Engineering at the Johns Hopkins University in Baltimore, MD. In September 1995 he accepted appointment as Associate professor in the Department of Electrical Engineering of the University of Notre Dame, Notre Dame, IN. He was promoted to full professor in 2001 and teaches courses in Communications, Information Theory, Coding, and Complexity Theory. He received the 1994 Thompson prize paper award from the IEEE, the 1994 Marconi Young Scientist Award from the Marconi Foundation, and the 1998 Judith Resnik Award from the IEEE.Host: Dr. P. Vijay Kumar, vijayk@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. -
Coding: from Information Theory to Hardware
Sun, Nov 21, 2004 @ 09:30 AM - 10:30 AM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
SPEAKER: Dr. Oliver Collins, University of Notre DameABSTRACT: This talk presents new results in both the outer (channel coding) and inner (transmitter hardware) layers of communication systems. The first part of the talk introduces the concept of coding for variable channel coherence. The need for this type of coding arises naturally in the multi-user broadcast channel since the more mobile a terminal, the harder it is for it to maintain coherence. The talk shows that non-coherent users can be accommodated without loss to the overall capacity, as long as there are not too many of them. This argument leads naturally to an efficient (capacity lossless) method of using codes designed for memoryless channels on channels with memory and to new ways of calculating the capacity of fading channels.The second part of the talk explains how a low rate purely digital code labeling a trellis can be used to perform modulation as well as coding. This new approach allows for a completely digital transmitter. There are no analog up-conversion stages required at the transmitter; the binary stream coming out of the modulator is simply filtered and directly radiated. The talk concludes with experimental results, i.e., real RF measurements for GMSK and BPSK and a demonstration of a working prototype.Bio: Oliver M. Collins (Fellow 2002) was born in Washington, DC. He received the B.S. degree in Engineering and Applied Science in 1986, and the M.S. and Ph.D. degrees in Electrical Engineering in 1987 and 1989, all from the California Institute of Technology in Pasadena, CA.From 1989 to 1995 he was an Assistant Professor and later an Associate Professor in the Department of Electrical and Computer Engineering at the Johns Hopkins University in Baltimore, MD. In September 1995 he accepted appointment as Associate professor in the Department of Electrical Engineering of the University of Notre Dame, Notre Dame, IN. He was promoted to full professor in 2001 and teaches courses in Communications, Information Theory, Coding, and Complexity Theory. He received the 1994 Thompson prize paper award from the IEEE, the 1994 Marconi Young Scientist Award from the Marconi Foundation, and the 1998 Judith Resnik Award from the IEEE.Host: Dr. P. Vijay Kumar, vijayk@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. -
Coding: from Information Theory to Hardware
Mon, Nov 22, 2004 @ 09:30 AM - 10:30 AM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
SPEAKER: Dr. Oliver Collins, University of Notre DameABSTRACT: This talk presents new results in both the outer (channel coding) and inner (transmitter hardware) layers of communication systems. The first part of the talk introduces the concept of coding for variable channel coherence. The need for this type of coding arises naturally in the multi-user broadcast channel since the more mobile a terminal, the harder it is for it to maintain coherence. The talk shows that non-coherent users can be accommodated without loss to the overall capacity, as long as there are not too many of them. This argument leads naturally to an efficient (capacity lossless) method of using codes designed for memoryless channels on channels with memory and to new ways of calculating the capacity of fading channels.The second part of the talk explains how a low rate purely digital code labeling a trellis can be used to perform modulation as well as coding. This new approach allows for a completely digital transmitter. There are no analog up-conversion stages required at the transmitter; the binary stream coming out of the modulator is simply filtered and directly radiated. The talk concludes with experimental results, i.e., real RF measurements for GMSK and BPSK and a demonstration of a working prototype.Bio: Oliver M. Collins (Fellow 2002) was born in Washington, DC. He received the B.S. degree in Engineering and Applied Science in 1986, and the M.S. and Ph.D. degrees in Electrical Engineering in 1987 and 1989, all from the California Institute of Technology in Pasadena, CA.From 1989 to 1995 he was an Assistant Professor and later an Associate Professor in the Department of Electrical and Computer Engineering at the Johns Hopkins University in Baltimore, MD. In September 1995 he accepted appointment as Associate professor in the Department of Electrical Engineering of the University of Notre Dame, Notre Dame, IN. He was promoted to full professor in 2001 and teaches courses in Communications, Information Theory, Coding, and Complexity Theory. He received the 1994 Thompson prize paper award from the IEEE, the 1994 Marconi Young Scientist Award from the Marconi Foundation, and the 1998 Judith Resnik Award from the IEEE.Host: Dr. P. Vijay Kumar, vijayk@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. -
Coding: from Information Theory to Hardware
Tue, Nov 23, 2004 @ 09:30 AM - 10:30 AM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
SPEAKER: Dr. Oliver Collins, University of Notre DameABSTRACT: This talk presents new results in both the outer (channel coding) and inner (transmitter hardware) layers of communication systems. The first part of the talk introduces the concept of coding for variable channel coherence. The need for this type of coding arises naturally in the multi-user broadcast channel since the more mobile a terminal, the harder it is for it to maintain coherence. The talk shows that non-coherent users can be accommodated without loss to the overall capacity, as long as there are not too many of them. This argument leads naturally to an efficient (capacity lossless) method of using codes designed for memoryless channels on channels with memory and to new ways of calculating the capacity of fading channels.The second part of the talk explains how a low rate purely digital code labeling a trellis can be used to perform modulation as well as coding. This new approach allows for a completely digital transmitter. There are no analog up-conversion stages required at the transmitter; the binary stream coming out of the modulator is simply filtered and directly radiated. The talk concludes with experimental results, i.e., real RF measurements for GMSK and BPSK and a demonstration of a working prototype.Bio: Oliver M. Collins (Fellow 2002) was born in Washington, DC. He received the B.S. degree in Engineering and Applied Science in 1986, and the M.S. and Ph.D. degrees in Electrical Engineering in 1987 and 1989, all from the California Institute of Technology in Pasadena, CA.From 1989 to 1995 he was an Assistant Professor and later an Associate Professor in the Department of Electrical and Computer Engineering at the Johns Hopkins University in Baltimore, MD. In September 1995 he accepted appointment as Associate professor in the Department of Electrical Engineering of the University of Notre Dame, Notre Dame, IN. He was promoted to full professor in 2001 and teaches courses in Communications, Information Theory, Coding, and Complexity Theory. He received the 1994 Thompson prize paper award from the IEEE, the 1994 Marconi Young Scientist Award from the Marconi Foundation, and the 1998 Judith Resnik Award from the IEEE.Host: Dr. P. Vijay Kumar, vijayk@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. -
Coding: from Information Theory to Hardware
Wed, Nov 24, 2004 @ 09:30 AM - 10:30 AM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
SPEAKER: Dr. Oliver Collins, University of Notre DameABSTRACT: This talk presents new results in both the outer (channel coding) and inner (transmitter hardware) layers of communication systems. The first part of the talk introduces the concept of coding for variable channel coherence. The need for this type of coding arises naturally in the multi-user broadcast channel since the more mobile a terminal, the harder it is for it to maintain coherence. The talk shows that non-coherent users can be accommodated without loss to the overall capacity, as long as there are not too many of them. This argument leads naturally to an efficient (capacity lossless) method of using codes designed for memoryless channels on channels with memory and to new ways of calculating the capacity of fading channels.The second part of the talk explains how a low rate purely digital code labeling a trellis can be used to perform modulation as well as coding. This new approach allows for a completely digital transmitter. There are no analog up-conversion stages required at the transmitter; the binary stream coming out of the modulator is simply filtered and directly radiated. The talk concludes with experimental results, i.e., real RF measurements for GMSK and BPSK and a demonstration of a working prototype.Bio: Oliver M. Collins (Fellow 2002) was born in Washington, DC. He received the B.S. degree in Engineering and Applied Science in 1986, and the M.S. and Ph.D. degrees in Electrical Engineering in 1987 and 1989, all from the California Institute of Technology in Pasadena, CA.From 1989 to 1995 he was an Assistant Professor and later an Associate Professor in the Department of Electrical and Computer Engineering at the Johns Hopkins University in Baltimore, MD. In September 1995 he accepted appointment as Associate professor in the Department of Electrical Engineering of the University of Notre Dame, Notre Dame, IN. He was promoted to full professor in 2001 and teaches courses in Communications, Information Theory, Coding, and Complexity Theory. He received the 1994 Thompson prize paper award from the IEEE, the 1994 Marconi Young Scientist Award from the Marconi Foundation, and the 1998 Judith Resnik Award from the IEEE.Host: Dr. P. Vijay Kumar, vijayk@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. -
Coding: from Information Theory to Hardware
Thu, Nov 25, 2004 @ 09:30 AM - 10:30 AM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
SPEAKER: Dr. Oliver Collins, University of Notre DameABSTRACT: This talk presents new results in both the outer (channel coding) and inner (transmitter hardware) layers of communication systems. The first part of the talk introduces the concept of coding for variable channel coherence. The need for this type of coding arises naturally in the multi-user broadcast channel since the more mobile a terminal, the harder it is for it to maintain coherence. The talk shows that non-coherent users can be accommodated without loss to the overall capacity, as long as there are not too many of them. This argument leads naturally to an efficient (capacity lossless) method of using codes designed for memoryless channels on channels with memory and to new ways of calculating the capacity of fading channels.The second part of the talk explains how a low rate purely digital code labeling a trellis can be used to perform modulation as well as coding. This new approach allows for a completely digital transmitter. There are no analog up-conversion stages required at the transmitter; the binary stream coming out of the modulator is simply filtered and directly radiated. The talk concludes with experimental results, i.e., real RF measurements for GMSK and BPSK and a demonstration of a working prototype.Bio: Oliver M. Collins (Fellow 2002) was born in Washington, DC. He received the B.S. degree in Engineering and Applied Science in 1986, and the M.S. and Ph.D. degrees in Electrical Engineering in 1987 and 1989, all from the California Institute of Technology in Pasadena, CA.From 1989 to 1995 he was an Assistant Professor and later an Associate Professor in the Department of Electrical and Computer Engineering at the Johns Hopkins University in Baltimore, MD. In September 1995 he accepted appointment as Associate professor in the Department of Electrical Engineering of the University of Notre Dame, Notre Dame, IN. He was promoted to full professor in 2001 and teaches courses in Communications, Information Theory, Coding, and Complexity Theory. He received the 1994 Thompson prize paper award from the IEEE, the 1994 Marconi Young Scientist Award from the Marconi Foundation, and the 1998 Judith Resnik Award from the IEEE.Host: Dr. P. Vijay Kumar, vijayk@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.
