Frequency offset compensation using dotting sequences

H - Electricity – 04 – L

Patent

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Details

H04L 27/22 (2006.01) H04L 27/233 (2006.01) H04M 1/00 (2006.01) H04L 7/04 (2006.01) H04L 27/00 (2006.01)

Patent

CA 2228919

The along and perpendicular rails of a received signal (e.g., modulated using multi-phase shift keying) are rotated to compensate for frequency offsets between the carrier frequency of the received signal and the reference frequency of the local oscillator. The rotation angles are updated, based on the rotated along rail, during dotting sequences in the received signal. In one implementation, the dotting sequences are detected based on the rotate perpendicular rail. The beginnings of dotting sequences are detected by thresholding the average on the perpendicular rail and the ends of dotting sequences are detected by analyzing the encoded data for non-dotting-sequence values. In a cordless phone application, different dotting sequences may be used to distinguish base-to-handset transmissions from handset-to-base transmissions.

Les composantes longitudinale et transversale d'un signal reçu (par exemple, un signal modulé par déplacements de phase multiples) sont soumises à une rotation pour corriger les décalages entre la fréquence de porteuse du signal reçu et la fréquence de référence de l'oscillateur local. Les angles de rotation sont mis à jour à partir de la rotation de la composante longitudinale durant les suites de pointage du signal reçu. Dans l'une des concrétisations de l'invention, la détection des suites de pointage est basée sur la rotation de la composante transversale. La détection des débuts des suites de pointage est effectuée à l'aide d'un seuillage de la moyenne sur la composante transversale et la détection des fins de ces suites est effectuée par une recherche de valeurs de non-pointage dans les données codées. Dans les applications aux téléphones sans fil, des suites de pointage différentes peuvent être utilisées pour distinguer les transmissions du socle au combiné des transmissions du combiné au socle.

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