Titlebook: Cryptography and Coding; 7th IMA Internationa Michael Walker Conference proceedings 1999 Springer-Verlag Berlin Heidelberg 1999 AES.Boolean

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The Political and Economic Backgroundhold behaviour has been studied in many situations outside coding theory and a number of tools have been developped. One of those turns out to be particularly relevant to coding, namely the derivation of isoperimetric inequalities for product measures on Hamming spaces. we discuss this approach and

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The Political and Economic Backgroundhe rectangular complement operation. The notions of rectangular closure and basis were already defined. In this paper we represent a method to construct a rectangular basis of a linear code from a given linear basis.

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The Political and Economic Backgroundr block error-control (detection and correction) codes. The representation of codes by means of graphs, and the corresponding graph-based decoding algorithms, are described briefly. Results on the performance of graph decoding methods for block codes of the array and generalised array type will be p

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The Political and Economic Backgroundally efficient algorithm to determine whether or not a time-varying convolutional encoder is catastrophic is derived. This algorithm is shown to be simpler than the catastrophicity test proposed by Balakirsky [.]. Furthermore, the algorithm can easily be generalised to rate . time-varying convolutio

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