Apparatus and method for maximizing frequency offset...

H - Electricity – 04 – B

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H04B 1/18 (2006.01) H03J 7/06 (2006.01) H04L 27/22 (2006.01)

Patent

CA 2169551

An automatic frequency control loop structure utilizes a dual selection automatic frequency control unit which is coupled to a differential phase unit and a coherent phase unit to provide a frequency corrected received signal output for efficient tracking of frequency offset drift and a much lower probability of loss of automatic frequency control loop lock. Thus, a signal from a coherent carrier recovery process provides additional benefit by utilization in adjusting frequency offset tracking performance.

Structure (100) en boucle, destinée à la commande automatique de fréquence, comprenant un module (101) de commande automatique de fréquence à double sélection couplée à un circuit (103) à phase différentielle ainsi qu'à un circuit (102) à phase cohérente, afin de produire une valeur de sortie de signal reçu, corrigé en fréquence, destinée au dépistage efficace d'une dérive du décalage de fréquence, et permettant de réduire la probabilité d'une perte d'asservissement de la commande automatique de fréquence. Ainsi, un signal obtenu à partir d'un processus de récupération d'une porteuse cohérente présente l'avantage supplémentaire qu'il peut être utilisé pour régler l'exécution de la poursuite du décalage de fréquence.

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