Optimizing packet size to eliminate effects of reception nulls

H - Electricity – 04 – L

Patent

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H04L 1/00 (2006.01) H04J 3/16 (2006.01) H04Q 7/08 (2006.01) H04L 1/18 (2006.01)

Patent

CA 2215530

Packets are transmitted in different block sizes (21, 26) according to the speed of motion of the receiver (24, 29). The packet block size (21, 26) is selected to minimize the effects of burst errors that occur at the receiver. The burst errors are disbursed between all packets in the packet block by interleaving the packets together prior to transmission. The receiver then deinterleaves the packets into their original format disbursing burst errors between all packets in the packet block. Since each packet will only contain a small proportion of the burst error, standard ECC schemes can be used to correct for bit errors in each packet increasing the probability that all packets will be transmitted successfully.

Des paquets sont transmis selon différentes longueurs (21, 26) de blocs en fonction de la vitesse de déplacement de l'appareil récepteur (24, 29). La longueur (21, 26) du bloc de paquets est choisie de manière à minimiser les effets de salves d'erreurs survenant au niveau de l'appareil récepteur. Les salves d'erreurs sont diffusées entre tous les paquets dans le bloc de paquets par entrelacement des paquets les uns avec les autres, avant leur transmission. L'appareil récepteur désentrelace alors les paquets pour leur rendre leur format d'origine en diffusant les salves d'erreurs entre tous les paquets dans le bloc de paquets. Etant donné que chaque paquet contient seulement une petite proportion de la salve d'erreurs, on peut utiliser des schémas de code de vérification et de correction d'erreurs afin de corriger les erreurs sur un bit dans chaque paquet, accroissant ainsi la probabilité d'une transmission réussie de tous les paquets.

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