Digital block processor for processing a plurality of...

H - Electricity – 03 – D

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H03D 3/00 (2006.01) H04B 1/26 (2006.01) H04B 7/26 (2006.01)

Patent

CA 2083303

A digital block receiver system, in a cellular/wireless FM radiotelephony system, receives and heterodyne a block of cellular/wireless receive channels to a very low block IF signal by analog processing. This block IF signal is applied to a precision high speed A/D converter and converted to a digitized time series. A window function is applied to the digitized time series and a high speed FFT is applied to frequency isolate the individual channels. The active channels are digitally processed by a DSP to recover the FM channel modulation.

L'invention est un système de réception de blocs numériques faisant partie d'un système de radiotéléphonie FM cellulaire qui reçoit un bloc de signaux de communication sans fil et effectue sur eux un hétérodynage qui les transforme en un bloc de signaux FI au moyen d'un traitement analogique. Ce bloc de signaux FI est transmis à un convertisseur analogique-numérique rapide de précision et est converti en une série temporelle numérisée. Cette série temporelle numérisée est soumise à une fonction de fenêtrage et une transformation de Fourier rapide est effectuée pour obtenir un isolement fréquentiel des signaux des canaux individuels. Les signaux des canaux actifs sont transmis à un processeur à signaux numériques pour recouvrer le signal de modulation de fréquence.

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