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Universal redundancy rates for the class of B-processes do not exist

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2 Author(s)
Shields, A. ; Dept. of Math., Toledo Univ., OH, USA ; Weiss, B.

Shows that for any sequence ρ(n)=o(n) and any sequence of prefix codes, there is a B-process of entropy arbitrarily close to the maximum possible entropy for which the expected redundancy is at least as large as ρ(n) for infinitely many n. This extends work of Shields (1993), whose examples had O entropy. The class of B-processes, that is, stationary codings of independent and identically distributed (i.i.d.) processes, includes the aperiodic Markov chains and functions thereof, aperiodic renewal and regenerative processes, and m-dependent processes, as well as many other processes of interest. In particular, the results show that the search for a universal redundancy rate for the class of all B-processes is doomed to failure, and redundancy rates for any given subclass must be obtained by direct analysis of that subclass

Published in:

Information Theory, IEEE Transactions on  (Volume:41 ,  Issue: 2 )

Date of Publication:

Mar 1995

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