Forward error correction on multiplexed cdma channels...

G - Physics – 11 – B

Patent

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G11B 20/18 (2006.01) H03M 13/35 (2006.01) H04L 1/00 (2006.01) H04L 1/18 (2006.01) H04L 25/14 (2006.01)

Patent

CA 2365641

A protocol for optimizing the use of coded transmissions such as over wireless links. In this technique, interframes are first split into segments selected to be an optimum size according to transmission characteristics of the radio channel. Segments are assigned a position identifier and redundancy check sum. Segments are then assembled into blocks and a forward error correction algorithm is applied to the block to generate redundancy bits. The FEC block is then split up among available communication channels and forwarded to the receiver. The inverse process is applied at the receiver. Using this scheme, only segments containing erroneous data need to be resent. A large block size required for high performance forward error correction may therefore be used while at the same time minimizing latencies associated with the need to resend entire blocks when errors cannot be recovered.

L'invention concerne un protocole permettant d'optimiser l'utilisation de transmissions codées, notamment via des liaisons sans fil. Selon cette technique, les inter-images sont d'abord divisées en segments dont la dimension optimale est conforme aux caractéristique de transmission du canal radio. On attribue aux segments un identificateur de position et la somme des contrôles par redondance, puis on les assemble en blocs (groupes binaires) auxquels est appliqué un algorithme de correction d'erreur automatique de manière à générer des bits de redondance. Le bloc de correction d'erreur automatique est réparti en plusieurs canaux de communication disponibles et retransmis au récepteur. Le processus inverse est ensuite mis en route à partir du récepteur. Grâce à ce plan, seuls les segments contenant des données erronées doivent être renvoyés. Aussi, on utilise une dimension de bloc importante assurant la correction d'erreur automatique haut débit tandis que, parallèlement, on réduit les temps d'attente au minimum pour le renvoi des blocs en entier, lorsque les erreurs ne peuvent être récupérées.

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