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Identifiability of hidden Markov information sources and their minimum degrees of freedom

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3 Author(s)
Ito, H. ; Dept. of Math. Eng. & Inf. Phys., Tokyo Univ., Japan ; Amari, S.-I. ; Kobayashi, K.

If only a function of the state in a finite-state Markov chain is observed, then the stochastic process is no longer Markovian in general. This type of information source is found widely and the basic problem of its identifiability remains open, that is, the problem of showing when two different Markov chains generate the same stochastic process. The identifiability problem is completely solved by linear algebra, where a block structure of a Markov transition matrix plays a fundamental role, and from which the minimum degree of freedom for a source is revealed.<>

Published in:

Information Theory, IEEE Transactions on  (Volume:38 ,  Issue: 2 )

Date of Publication:

March 1992

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