Method and system for allocating convolutional encoded bits...

H - Electricity – 03 – M

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H03M 13/25 (2006.01) H03M 13/00 (2006.01) H03M 13/23 (2006.01) H03M 13/27 (2006.01) H03M 13/35 (2006.01) H04L 1/22 (2006.01) H04L 27/18 (2006.01)

Patent

CA 2431698

A method and corresponding apparatus for encoding a sequence of bits for transmission as symbols, some of the bit positions of the symbols having a higher bit error rate than other bit positions. The method includes: a step (31, 32, 41, 42) of providing a plurality of sequences of bits using a convolutional encoder (31, 41), in response to a sequence of input bits, each sequence of bits being defined by a predetermined generator polynomial having a predetermined level of sensitivity to puncturing; and a step (33, 44) of mapping the bits of each sequence of bits to symbol positions based on the level of sensitivity of the generator polynomial defining the sequence of bits. With interleaving, the mapping of bits of each sequence of bits to symbol positions (33, 44) can precede a symbol interleaving step (34), or it can follow a bit interleaving step (43).

L'invention concerne un procédé et un appareil associé permettant de coder une séquence de bits à transmettre sous forme de symboles, certaines des positions binaires des symboles présentant un taux d'erreur binaire supérieur à d'autres positions binaires. Ce procédé comprend une étape (31, 32, 41, 42) consistant à fournir plusieurs séquences de bits au moyen d'un codeur convolutif (31, 41), en réponse à une séquence de bits d'entrée, chaque séquence de bits étant définie par un polynôme générateur prédéterminé présentant un niveau de sensibilité à la perforation prédéterminé, ainsi qu'une étape (33, 44) consistant à placer les bits de chaque séquence de bits à des positions de symboles d'après le niveau de sensibilité du polynôme générateur définissant la séquence de bits. En cas d'entrelacement, la mise en place des bits de chaque séquence de bits à des positions de symboles (33, 44) peut intervenir avant une étape d'entrelacement de symboles (34) ou après une étape d'entrelacement de bits (43).

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