Frequency estimating circuit and afc circuit using the same

Details Frequency estimating circuit and afc circuit using the same Frequency estimating circuit and afc circuit using the same

G - Physics

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R

G01R 23/02 (2006.01) H03J 7/04 (2006.01) H04B 1/18 (2006.01) H04L 7/033 (2006.01) H04L 27/233 (2006.01) H04L 27/00 (2006.01)

Patent

CA 2196468

This invention provides a frequency estimating circuit in which estimating a frequency offset distributed outside the observation range based on the frequency of a received pilot signal degenerated into the observation range. The frequency estimating circuit comprises a time-axis to frequency-axis converter circuit for converting an input data stream constructed of a sampled quantized received pilot signal into a signal on a frequency axis to determine a power spectrum, and an MAX search circuit for searching for the maximum value of the power spectrum to determine the frequency f1, corresponding to the maximum value of the power spectrum, and a frequency computing circuit for computing candidates of a frequency offset distributed outside the observation range based on the frequency f1 and for outputting them as frequency information fEST.

Cette invention est un circuit servant à évaluer un décalage de fréquence réparti à l'extérieur de la gamme d'observation qui se base sur la fréquence d'un signal pilote dégénéré capté dans la gamme d'observation. Ce circuit comprend un circuit de conversion temps-fréquence servant à convertir une chaîne de données, celle-ci étant construite à partir d'un échantillon du signal pilote quantifié capté, en un signal sur un axe fréquentiel pour déterminer le spectre de fréquences, un circuit de recherche du maximum de la puissance pour déterminer la fréquence f1 du maximum de la puissance, et un circuit qui se base sur la fréquence f1 pour calculer les fréquences de décalage possibles réparties à l'extérieur de la gamme d'observation et produire ces décalages sous la forme de fréquences fEST.

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