Channel encoding and decoding method and apparatus

H - Electricity – 04 – B

Patent

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Details

H04B 7/212 (2006.01) G06F 11/00 (2006.01) H03J 7/06 (2006.01) H04B 7/185 (2006.01) H04L 1/20 (2006.01) H04L 7/02 (2006.01) H04L 7/04 (2006.01) H04L 12/56 (2006.01) H04L 27/22 (2006.01) H04L 27/233 (2006.01) H04N 7/24 (2006.01) G06F 11/14 (2006.01)

Patent

CA 2384303

A method and apparatus related to a communication system in which a plurality of remote units encode data bursts using a predetermined codeword set and transmit the encoded data bursts to a hub station over a multiple-access channel. When the hub station receives a data burst from one of the remote units, the hub station demodulates the received data burst and correlates the received data burst with each codeword within the predetermined codeword set to determine which codeword has the maximum correlation. The hub station uses the correlation to derive a timing synchronization signal and/or a carrier frequency adjustment signal to be sent back to the remote unit. The signals provide information to the remote unit to synchronize its timing or adjust its carrier frequency for transmitting subsequent data bursts. The hub station may also use the correlation to estimate a signal-to-noise ratio.

L'invention concerne un procédé et un dispositif ayant un système de communication dans lequel une pluralité d'équipements installés à distance codent des paquets de données en utilisant un ensemble de mots codés prédéterminés et transmettent ces paquets de données codées à une station pivot sur un canal d'accès multiple. Lorsque la station pivot reçoit un paquet de données provenant de l'un des équipements installés à distance, la station pivot démodule le paquet de données reçu et le met en corrélation avec chaque mot codé appartenant à l'ensemble de mots codés afin de déterminer quel mot possède la plus grande corrélation. La station pivot utilise la corrélation pour dériver un signal de synchronisation d'horloge et/ou un signal de réglage de fréquence porteuse devant être renvoyé à l'équipement installé à distance. Les signaux fournissent des informations à l'équipement installé à distance afin de synchroniser son horloge ou ajuster sa fréquence porteuse pour pouvoir transmettre les paquets de données. La station pivot peut également utiliser la corrélation pour estimer le rapport signal/bruit.

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