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Events for November 12, 2004
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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.
