Frequency drift correction in subscriber terminals

Details Frequency drift correction in subscriber terminals Frequency drift correction in subscriber terminals

H - Electricity

03

L

H03L 7/06 (2006.01) H04N 7/20 (2006.01) H04Q 7/32 (2006.01) H04N 7/173 (2006.01) H04N 5/44 (2006.01) H04N 7/16 (2006.01)

Patent

CA 2237465

A frequency control system and method for minimizing frequency drifts in subscriber terminals in a point-to-multipoint system is described enabling the use of low cost oscillators (5) in the subscriber terminals by measuring the frequency offset (9) of the subscriber terminal's receiver to estimate its oscillator frequency drift which is then used to correct the subscriber terminal's transmitter (12) frequency and also by feedback of a frequency correction from the base station to the subscriber.

L'invention concerne un système et un procédé de commande de fréquences pour minimiser les dérives de fréquences dans les terminaux d'abonnés, dans un système point à multipoint. Ce système permet d'utiliser des oscillateurs à faibles coûts (5) dans les terminaux d'abonnés en mesurant le décalage de fréquence (9) du récepteur du terminal d'abonnés pour estimer la dérive de la fréquence de son oscillateur qui est, ensuite, utilisée pour corriger la fréquence de l'émetteur du terminal d'abonné (12). En outre, ce système utilise la rétroaction d'une correction de fréquence provenant de la station de base à destination de l'abonné.

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