Characterization of ergodic hidden Markov sources

  • Authors:
  • Alexander Schönhuth;Herbert Jaeger

  • Affiliations:
  • School of Computing Science, Simon Fraser University, Burnaby, BC, Canada;Jacobs University Bremen, School of Engineering and Science, Bremen, Germany

  • Venue:
  • IEEE Transactions on Information Theory
  • Year:
  • 2009

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Abstract

An algebraic criterion for the ergodicity of discrete random sources is presented. For finite-dimensional sources, which contain hidden Markov sources as a subclass, the criterion can be effectively computed. This result is obtained on the background of a novel, elementary theory of discrete random sources, which is based on linear spaces spanned by word functions, and linear operators on these spaces. An outline of basic elements of this theory is provided.