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On the capacity of generalized write-once memory with state transitions described by an arbitrary directed acyclic graph

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2 Author(s)
Fang-Wei Fu ; Dept. of Math., Nankai Univ., Tianjin, China ; Vinck, A.J.H.

The generalized write-once memory introduced by Fiat and Shamir (1984) is a q-ary information storage medium. Each storage cell is expected to store one of q symbols, and the legal state transitions are described by an arbitrary directed acyclic graph. This memory model can be understood as a generalization of the binary write-once memory which was introduced by Rivest and Shamir (1982). During the process of updating information, the contents of a cell can be changed from a 0-state to a 1-state but not vice versa. We study the problem of reusing a generalized write-once memory for T successive cycles (generations). We determine the zero-error capacity region and the maximum total number of information hits stored in the memory for T consecutive cycles for the situation where the encoder knows and the decoder does not know the previous state of the memory. These results extend the results of Wolf, Wyner, Ziv, and Korner (1984) for the binary write-once memory

Published in:

Information Theory, IEEE Transactions on  (Volume:45 ,  Issue: 1 )

Date of Publication:

Jan 1999

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