Frequency error estimating device and frequency error...

H - Electricity – 04 – L

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H04L 27/22 (2006.01) H03J 7/02 (2006.01) H04L 27/00 (2006.01)

Patent

CA 2343064

A frequency error estimating device for estimating the frequency error between the local oscillation frequency of a receiver and the carrier frequency of the received signal comprising a frequency error estimator (11) for suppressing the noise component included in the received signal according to the filter factor inputted to an averaging filter (23) and estimating the frequency error on the basis of the output of the filter, and a filter factor determinator (12) for calculating the filter factor from the difference of the estimate of the frequency error between first symbols and thereby changing the characteristics of the filter, wherein high estimation accuracy of the estimation of the frequency error of a receiver can be ensured without marring the follow-up ability with respect to the variation with time due to the Doppler frequency.

L'invention porte sur un dispositif d'estimation d'erreur de fréquence qui permet d'estimer l'erreur de fréquence entre la fréquence d'oscillation locale d'un récepteur et la fréquence de porteuse du signal reçu. Ce dispositif comprend un estimateur (11) d'erreur de fréquence destiné à supprimer la composante bruit inclue dans le signal reçu conformément au coefficient d'atténuation introduit dans un filtre (23) intégrateur et à estimer l'erreur de fréquence sur la base de la sortie du filtre. Le dispositif comprend également un déterminateur (12) de coefficient d'atténuation destiné à calculer le coefficient d'atténuation à partir de la différence d'estimation d'erreur de fréquence entre des premiers symboles et à modifier en conséquence les caractéristiques du filtre. Il est possible d'obtenir une grande précision d'estimation de l'erreur de fréquence d'un récepteur sans nuire à l'aptitude de suivi par rapport à la variation en temps due à la fréquence Doppler.

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