Cloud Radio Access Networks, Distributed Information Bottleneck, and more: A Unified Information Theoretic View

Date: Tuesday, February 19
Time: 2:00 – 3:00 pm
Location: EE Conference Room, Mudd 1300
Speaker: Prof. Shlomo Shamai, Technion Distinguished Professor, and the William Fondiller Chair of Telecommunications
The Viterbi Faculty of Electrical Engineering, Technion-Israel Institute of Technology
Faculty Host: Prof. Debasis Mitra

Abstract: We consider transmission over a cloud radio access network (CRAN) focusing on the framework of oblivious processing at the relay nodes (radio units), i.e., the relays are not cognizant of the users' codebooks.

This approach is motivated by future wireless communications (5G and beyond) and the theoretical results connect to a variety of different information theoretic models and problems.

First it is shown that relaying a-la Cover-El Gamal, i.e., compress-and-forward with joint decompression and decoding, which reflects 'noisy network coding,' is optimal.

The penalty of obliviousness is also demonstrated to be at most a constant gap, when compared to cut-set bounds.

Naturally, due to the oblivious (nomadic) constraint the CRAN problem intimately connects to Chief Executive Officer (CEO) source(s) coding under a logarithmic loss distortion measure.

Furthermore, we identify and elaborate on some interesting connections with the distributed information bottleneck model for which we characterize optimal tradeoffs between rates (i.e., complexity) and information (i.e., accuracy) in the discrete and vector Gaussian frameworks.

Further connections to 'information combining' and 'common reconstruction' are also pointed out. In the concluding outlook, some interesting problems are mentioned such as the characterization of the optimal input distributions under users' power limitations and rate-constrained compression at the relay nodes.

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Joint work with: I.E. Aguerri (Paris Research Center, Huawei France) A. Zaidi (Universite Paris-Est, Paris) and G. Caire (USC-LA and TUB, Berlin)The research is supported by the European Union's Horizon 2020 Research and Innovation Programme: no. 694630.

Biography: Shlomo Shamai (Shitz) received the B.Sc., M.Sc., and Ph.D. degrees in electrical engineering from the Technion---Israel Institute of Technology, in 1975, 1981 and 1986 respectively.

During 1975-1985 he was with the Communications Research Labs, in the capacity of a Senior Research Engineer. Since 1986 he is with the Department of Electrical Engineering, Technion---Israel Institute of Technology, where he is now a Technion Distinguished Professor, and holds the William Fondiller Chair of Telecommunications.

His research interests encompass a wide spectrum of topics in information theory and statistical communications.

Dr. Shamai (Shitz) is an IEEE Life Fellow, an URSI Fellow, a member of the Israeli Academy of Sciences and Humanities and a foreign member of the US National Academy of Engineering. He is the recipient of the 2011 Claude E. Shannon Award, the 2014 Rothschild Prize in Mathematics/Computer Sciences and Engineering and the 2017 IEEE Richard W. Hamming Medal. He is a co-recipient of the 2018 Third Bell Labs Prize for Shaping the Future of Information and Communications Technology.

He has been awarded the 1999 van der Pol Gold Medal of the Union Radio Scientifique Internationale (URSI), and is a co-recipient of the 2000 IEEE Donald G. Fink Prize Paper Award, the 2003, and the 2004 joint IT/COM societies paper award, the 2007 IEEE Information Theory Society Paper Award, the 2009 and 2015 European Commission FP7, Network of Excellence in Wireless COMmunications (NEWCOM++, NEWCOM#) Best Paper Awards, the 2010 Thomson Reuters Award for International Excellence in Scientific Research, the 2014 EURASIP Best Paper Award (for the EURASIP Journal on Wireless Communications and Networking), the 2015 IEEE Communications Society Best Tutorial Paper Award and the 2018 IEEE Signal Processing Best Paper Award. Dr. Shamai (Shitz) is listed as a Highly Cited Researcher (Computer Science) for the years 2013/4/5/6/7/8.

He is also the recipient of 1985 Alon Grant for distinguished young scientists and the 2000 Technion Henry Taub Prize for Excellence in Research.

He has served as Associate Editor for the Shannon Theory of the IEEE Transactions on Information Theory, and has also served twice on the Board of Governors of the Information Theory Society. He has also served on the Executive Editorial Board of the IEEE Transactions on Information Theory and on the IEEE Information Theory Society Nominations and Appointments Committee, and serves on the IEEE Information Theory Society, Shannon Award Committee.

Event Contact Information: Eliese Lissner | el3001@columbia.edu


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