Increasing S Parameter of Interleavers

An algorithm to increase the S parameter up to a value allowed by the reasonable generating of a S -random interleaver is presented. The method is appropriate for both random and determinist interleavers, as Welch-Costas, Takeshita-Costello or the one given by the UMTS standard. Concurrently, the algorithm realizes a randomization of the permutation, the dispersion being typical for a random interleaver, namely, 0.81 (excepting the interleavers with high dispersion when a small S -parameter is imposed).