Methods for the generation of S-random interleavers for turbo decoders with a parallel structure

Abstract

The method allows to obtain, starting from an initial S-random interleaver permutation, stored in memory devices and having a spread S, a size K and a degree of parallelism M<K, and collision-free, an interleaver permutation having an increased size, which is also collision-free, by an expansion technique which is carried out by electronic processing devices connected to the memory devices. In each of the subsequent iteration, the initial interleaver permutation is added with M terms or elements which obey a predetermined condition, inserted in respective positions which satisfy a predetermined relationship. In each of said iterations, the choice of the values the M elements added to the permutation is made by means of a procedure which implements a predetermined optimisation criterion, adapted to maximise the spread value of the resulting interleaver permutation.

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