To code or not to code: Revisited

Victoria Kostina, Sergio Verdú

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Scopus citations


We revisit the dilemma of whether one should or should not code when operating under delay constraints. In those curious cases when the source and the channel are probabilistically matched so that symbol-by-symbol coding is optimal in terms of the average distortion achieved, we show that it also achieves the dispersion of joint source-channel coding. Moreover, even in the absence of such probabilistic matching between the source and the channel, symbol-by-symbol transmission, though asymptotically suboptimal, might outperform not only separate source-channel coding but also the best known random-coding joint source-channel coding achievability bound in the finite blocklength regime.

Original languageEnglish (US)
Title of host publication2012 IEEE Information Theory Workshop, ITW 2012
Number of pages5
StatePublished - 2012
Event2012 IEEE Information Theory Workshop, ITW 2012 - Lausanne, Switzerland
Duration: Sep 3 2012Sep 7 2012

Publication series

Name2012 IEEE Information Theory Workshop, ITW 2012


Other2012 IEEE Information Theory Workshop, ITW 2012

All Science Journal Classification (ASJC) codes

  • Information Systems


  • Achievability
  • Shannon theory
  • converse
  • finite blocklength regime
  • joint source-channel coding
  • lossy source coding
  • memoryless sources
  • rate-distortion theory


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