Method and apparatus for interleaving low density parity...

H - Electricity – 03 – M

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H03M 13/13 (2006.01) H04W 80/00 (2009.01) H03M 13/27 (2006.01)

Patent

CA 2695276

Systems, methods and apparatus are described to interleave LDPC coded data for reception over a mobile communications channel, such as, for example, a satellite channel. In exemplary embodiments of the present invention, a method for channel interleaving includes segmenting a large LDPC code block into smaller codewords, randomly shuffling the code segments of each codeword and then convolutionally interleaving the randomly shuffled code words. In exemplary embodiments of the present invention, such random shuffling can guarantee that no two consecutive input code segments will be closer than a defined minimum number of code segments at the output of the shuffler. In exemplary embodiments of the present invention, by keeping data in, for example, manageable sub-sections, accurate SNR estimations, which are needed for the best possible LDPC decoding performance, can be facilitated based on, for example, iterative bit decisions.

L'invention concerne des systèmes, des procédés et des dispositifs d'entrelacement de données à codes LDPC aux fins de réception sur canal de communications mobiles, par exemple canal de communications par satellite. Selon certaines variantes, à titre d'exemples, l'invention concerne un procédé d'entrelacement de canal qui consiste à segmenter un important bloc de code LDPC en mots de code moins importants, à mélanger de façon aléatoire les segments de code de chaque mot de code et ensuite à entrelacer en mode de convolution ces mots de code ainsi mélangés. Dans certains exemples de variantes, un tel mélange permet de garantir qu'il n'y aura pas deux segments de code d'entrée consécutifs plus proches qu'un nombre minimum de segments de code à la sortie du mélangeur. Dans certains cas de variantes, le fait de maintenir des données, par exemple, dans des sous-sections raisonnables, il est possible de faciliter les estimations précises de rapport signal/bruit, ces estimations étant nécessaires pour assurer une performance optimale de décodage LDPC, sur la base, par exemple, de décisions binaires itératives.

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