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SUMMARY:Cloud Radio Access Networks\, Distributed Information Bottleneck\,
  and more: A Unified Information Theoretic View
DTSTART:20180830T140000
DTEND:20180830T150000
DTSTAMP:20260407T110727Z
UID:907c11136e865e1605f9fe661d458190dc6594be3962e5575317bc6c
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Shlomo Shamai\nThe Viterbi Faculty of Electrical Enginee
 ring\nTechnion-Israel Institute of Technology\n \nWe consider transmissio
 n over a cloud radio access network (CRAN) focusing on the framework of ob
 livious processing at the relay nodes (radio units)\,\ni.e.\, the relays a
 re not cognizant of the users' codebooks. This approach is motivated by fu
 ture wireless communications (5G and beyond) and the theoretical results c
 onnect to a variety of different information theoretic models and problems
 .\n\nFirst 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 demons
 trated to be at most a constant gap\, when compared to cut-set bounds. Nat
 urally\, due to the oblivious (nomadic) constraint the CRAN problem intima
 tely connects to Chief Executive Officer (CEO) source(s) coding under a lo
 garithmic loss distortion measure.\nFurthermore\, we identify and elaborat
 e on some interesting connections with the distributed information bottlen
 eck 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\, s
 ome interesting problems are mentioned such as the characterization of the
  optimal input distributions under users' power limitations and rate-const
 rained compression at the relay nodes.\n==========================\nJoint 
 work with: I.E. Aguerri (Paris Research Center\, Huawei France) A. Zaidi (
 Universite Paris-Est\, Paris) and G. Caire (USC-LA and TUB\, Berlin)\nThe 
 research is supported by the European Union's Horizon 2020 Research And In
 novation Programme: no. 694630.
LOCATION:INR 113 https://plan.epfl.ch/?room=INR113
STATUS:CONFIRMED
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