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 13/00 (2006.01) G06F 11/10 (2006.01) H03M 13/09 (2006.01) H03M 13/11 (2006.01) H03M 13/15 (2006.01) H03M 13/29 (2006.01) H04B 1/00 (2006.01) H04L 1/00 (2006.01) H04L 27/00 (2006.01) H04L 27/18 (2006.01)

Patent

CA 2480208

An approach is provided for encoding short frame length Low Density Parity Check (LDPC) codes. An encoder (203) generates a LDPC code having an outer Bose Chaudhuri Hocquenghem (BCH) code. Structure is imposed on the LDPC codes by restricting portion part of the parity check matrix to be lower triangular and/or satisfying other requirements such that the communication between bit nodes and check nodes of the decoder (305) is simplified. Further, a cyclic redundancy check (CRC) encoder (209) is supplied to encode the input signal according to a CRC code. This approach has particular application in digital video broadcast services over satellite.

On prévoit une technique de codage de contrôle de parité à faible densité et à courte longueur de trames (LDPC). Un codeur (203) génère un code LDPC ayant un code externe Bose Chaudhuri Hocquenghem (BCH). Une structure est imposée aux codes LDPC en limitant une partie unitaire de la matrice de contrôle de parité pour qu'ils soient triangulaires inférieurs et/ou pour qu'ils remplissent d'autres exigences de manière à simplifier la communication entre les noeuds de bit et les noeuds de contrôle du décodeur (305). En outre, un encodeur (209) de contrôle de la redondance cyclique (CRC) est fourni pour coder le signal d'entrée selon un code CRC. Cette approche a une application particulière dans des services de diffusion vidéo numérique par satellite.

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