Digital receiver with fractionally-spaced self-recovery...

H - Electricity – 04 – L

Patent

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Details

H04L 27/38 (2006.01) H04L 7/02 (2006.01) H04L 7/027 (2006.01) H04L 25/03 (2006.01) H04L 25/06 (2006.01) H04L 27/01 (2006.01)

Patent

CA 2241897

A fractionally-spaced adaptively-equalized self-recovering digital receiver includes a fractionally-spaced adaptive filter for equalizing channel distortion which includes means for adaptively adjusting the coefficients of the fractionally-spaced filter with a self-recovering (blind) algorithm or a decision directed algorithm; means for changing the timing at which the data is sampled; means for estimating the sampling frequency offset in order to derive the optimal timing; means for synchronizing the signal resampling at the symbol rate using the statistics of the received data samples; means for evaluating the profile of the equalizer coefficients; and means for tracking carrier frequency offset.

L'invention porte sur un récepteur numérique à fractionnement spatial, à autorétablissement et à compensation adaptative comportant un filtre adaptatif à fractionnement spatial pour compenser les distorsions des canaux qui comprend lui-même des moyens d'ajustement adaptatif de ses coefficients recourant à un algorithme autorétablissant (aveugle) ou à un algorithme décisionnel. L'invention porte en outre sur un moyen de modification du rythme de l'échantillonnage; sur un moyen d'estimation du décalage de la fréquence d'échantillonnage pour en dériver le rythme optimal; sur un moyen de synchronisation du rééchantillonnage de signaux avec le taux des symboles à l'aide des statistiques relatives aux échantillons de données prélevés; sur un moyen d'évaluation du profil des coefficients de compensation; et sur des moyens de poursuite les décalages de la fréquence de la porteuse.

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