H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 1/712 (2011.01)
Patent
CA 2397390
A novel and improved method and apparatus for frequency tracking is described. Two main sources of error that contribute to the frequency difference between locally generated carriers and those used to modulate received signals include frequency offset between the two timing sources and doppler effects due to relative movement between the sources. The present invention provides a tracking mechanism for removing the effects of error due to frequency offset as well as compensation for frequency error due to doppler in a plurality of multipath signals. Each finger (700a..700n) of a RAKE receiver utilizing the present invention will compute a frequency error for that finger. The weighted average of all of these frequency errors is calculated (710) and filtered (720) to provide a control signal for varying the frequency of IF and RF frequency synthesizers, accounting for the common frequency offset seen at each finger. Additionally, each finger is equipped with a rotator (706a...706n) for providing frequency adjustment specific to that finger. The frequency of each finger is adjusted through feedback of the frequency error finger.
Chaque doigt d'un récepteur RAKE calcule une erreur de fréquence de doigt. La moyenne pondérée de toutes les erreurs de fréquence est calculée et filtrée pour former un signal de commande destiné à faire varier la fréquence de synthétiseurs de FI (fréquences intermédiaires) et de HF, compte tenu du décalage de fréquence commun observé à chaque doigt. De plus, chaque doigt est pourvu d'un rotateur servant à fournir un ajustage de fréquence spécifique du doigt. La fréquence de chaque doigt est ajustée par rétroaction de l'erreur de fréquence du doigt.
Agrawal Avneesh
Butler Brian
Challa Raghu
Roh Mark
Sih Gilbert
Qualcomm Incorporated
Smart & Biggar
LandOfFree
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