Filtering in a receiver that uses log-polar signal processing

Details Filtering in a receiver that uses log-polar signal processing Filtering in a receiver that uses log-polar signal processing

H - Electricity

03

H

H03H 17/02 (2006.01)

Patent

CA 2238192

A log-polar digital filter for processing a digitized log-polar signal that is a magnitude signal (rin) and an angle signal (PHIin), has a first converter for converting the log-polar signal into a converted linear Cartesian signal that includes an in-phase signal (Iin) and a quadrature signal (Qin). A linear Cartesian digital filter, coupled to the first converter, generates a filtered linear Cartesian signal from the converted linear Cartesian signal. The first converter may adapt a linearization of rin and compensate for gain errors introduced in an analog circuit that supplies a signal from which the digitized log-polar signal is derived. In another feature, a second converter may also be provided for converting the filtered linear Cartesian signal into a filtered log-polar signal that includes a filtered magnitude signal (rfilt) and a filtered angle signal (PHIfilt).

L'invention porte sur un filtre log polaire de signaux numériques composés d'un signal d'intensité (r¿in?) et d'un signal d'angle (PHI¿in?), et muni d'un premier convertisseur convertissant le signal log polaire en un signal linéaire en coordonnées cartésiennes composé d'un signal en phase (I¿in?) et d'un signal en quadrature (Q¿in?). Un filtre de signaux numériques cartésiens couplé au premier convertisseur produit un signal cartésien linéaire à partir du signal cartésien linéaire converti. Le premier convertisseur peut adapter une linéarisation de (r¿in?) et compenser les erreurs de gain introduites dans un circuit analogique fournissant un signal dont le signal numérisé, en log polaire, est dérivé. Dans une variante, on peut prévoir un second convertisseur convertissant le signal linéaire en coordonnées cartésiennes en un signal log polaire filtré comportant un signal filtré d'intensité (r¿filt?) et un signal filtré d'angle PHI¿filt?).

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