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SUMMARY:Information Theory of Real-Time Communication 
DTSTART:20140311T161500
DTEND:20140311T171500
DTSTAMP:20260930T211207Z
UID:04bfdb6779c4f503898ea134f42b1cb72c253e6b7dcd92ed859fa413
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Ashish Khisti\, University of Toronto http://www.comm.ut
 oronto.ca/~akhisti/\nAn increasing number of multimedia applications requi
 re real-time communication i.e.\, information must be transmitted sequenti
 ally with strict delay constraints. Both the fundamental limits and optima
 l codes for such systems can be very different from  classical models in 
 information theory. In this talk I will present  our recent work on sourc
 e and channel coding problems under such real-time constraints.\nThe first
  part of the talk will focus on communication over packet-erasure channels
  and introduce a class of "streaming codes" .  The encoder must process a
  stream of source packets in a causal fashion\, and the decoder must recon
 struct each source packet with a fixed delay. For a class of channels that
  introduce both burst and isolated erasures\, we will present near-optimal
  streaming codes and discuss their algebraic properties. Simulations over 
 the Gilbert-Elliott channel indicate that our proposed codes  achieve sig
 nificant gains over baseline erasure codes for certain channel parameters.
 \nIn the second part of this talk we will consider real-time transmission 
 of a Markov source over a burst-erasure channel. The encoder observes a se
 quence of source-vectors\, which must be compressed in a causal fashion. T
 he decoder must reconstruct each source-vector with a fixed delay\, except
  those sequences that belong to an outage period\, associated with the bur
 st-erasure. We will present an information theoretic tradeoff between the 
 compression-rate and the outage-duration. We will discuss how traditional 
 separation based architectures are sub-optimal and insights from some mult
 i-terminal source coding are relevant to the streaming setup.
LOCATION:INR 113 http://plan.epfl.ch/?zoom=20&recenter_y=5863814.94355&rec
 enter_x=730548.85489&layerNodes=fonds\,batiments\,labels\,information\,par
 kings_publics\,arrets_metro\,transports_publics&floor=1&q=INR113
STATUS:CONFIRMED
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