Reception timing detection circuit of cdma receiver and...

H - Electricity – 04 – B

Patent

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H04B 7/216 (2006.01) H04B 1/707 (2006.01) H04Q 7/22 (2006.01)

Patent

CA 2210475

A reception timing detection circuit of a CDMA receiver comprises an A/D converter for obtaining a digital reception signal, a correlator for obtaining a cross-correlation between the digital reception signal and a known signal series periodically within a predetermined lag, an interpolation filter for re-sampling a signal output from the correlator at a frequency higher than a sampling frequency for the A/D converter, a power calculation section for obtaining a re-sampled cross-correlation signal power, an averaging section for averaging the cross-correlation signal power over a plurality of cycles, and a peak detection section for obtaining a peak averaged cross-correlation signal power and determining an optimum reception timing.

L'invention est un circuit de détection d'instants de réception pour récepteur AMDC. Ce circuit comprend un convertisseur analogique-numérique, un corrélateur servant à corréler périodiquement durant un intervalle prédéterminé le signal converti et une suite de signaux connus, un filtre d'interpolation servant à rééchantillonner le signal de sortie du corrélateur à une fréquence supérieure à la fréquence d'échantillonnage du convertisseur analogique-numérique, une unité de calcul de la puissance du signal de corrélation rééchantillonné, une unité de moyennage de la puissance du signal de corrélation sur une pluralité de cycles et un détecteur de crête servant à obtenir la puissance de crête moyennée du signal de corrélation et à déterminer l'instant de réception optimal.

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