Method and system for providing short block length low...

Details Method and system for providing short block length low... Method and system for providing short block length low...

H - Electricity

03

M

H03M 13/11 (2006.01) H03M 13/15 (2006.01) H04B 7/15 (2006.01) H04L 1/22 (2006.01) H04L 27/20 (2006.01)

Patent

CA 2579629

An approach is provided for generating Low Density Parity Check (LDPC) codes. An LDPC encoder generates a short LDPC code by shortening longer mother codes. The short LDPC code has an outer Bose Chaudhuri Hocquenghem (BCH) code. According to another aspect, for an LDPC code with code rate of 3/5 utilizing 8-PSK (Phase Shift Keying) modulation, an interleaver provides for interleaving bits of the output LDPC code by serially writing data associated with the LDPC code column-wise into a table and reading the data row-wise from right to left. The above approach has particular application in digital video broadcast services over satellite.

Une approche permet de générer des codes de contrôle de parité à faible densité (LDPC). Un encodeur LDPC génère un code court en raccourcissant des codes mères plus longs. Le code LDPC court comporte un code Bose Chaudhuri Hocquenghem (BCH) externe. Selon un autre aspect, pour un code LDPC ayant un taux de 3/5 en utilisant une modulation par déplacement de phase 8-PSK, un entrelaceur entrelace les bits du code LDPC de sortie en inscrivant, en série, des données associées au code LDPC sous forme de colonne, dans un tableau, et en lisant les données par rangée, de la droite vers la gauche. L'approche décrite ici peut notamment s'appliquer aux services de radiodiffusion vidéonumérique par satellite.

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