Block interleaving for turbo coding

H - Electricity – 03 – M

Patent

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H03M 13/27 (2006.01)

Patent

CA 2360340

An interleaves receives incoming data frames of size N. The interleaves indexes the elements of the frame with an N1 × N2 index array. The interleaves then effectively rearranges (permutes) the data by permuting the rows of the index array. The interleaves employs the equation I(j,k) = I(j,(.alpha.j k + .beta.j)modP) to permute the columns (indexed by k) of each row (indexed by j.) P is at least equal to N2, .beta.j is a constant which may be different for each row, and each .alpha.j is a relative prime number relative to P. After permuting, the interleaver outputs the data in a different order than received (e.g., receives sequentially row by row, outputs sequentially each column by column).

Cette invention concerne un entrelaceur qui reçoit des trames de données entrantes de taille N. L'entrelaceur indexe les éléments de la trame au moyen d'une matrice d'indexation N1 x N2. Il ré-agence ensuite les données en permutant les rangées de la matrice. Il utilise l'équation I(j,k) = I(j,( alpha jk + beta j)modP) pour permuter les colonnes (indexées par k) de chaque rangée (indexée par j.) P est au moins égal à N2, beta j est une constante qui peut être différente pour chaque rangée et chaque alpha j est un nombre premier relatif par rapport à P. Après permutation, l'entrelaceur restitue les données dans un ordre autre que celui dans lequel il les a reçues (en d'autres termes, réception séquentielle rangée par rangée, sortie séquentielle colonne par colonne).

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