Single side-band modulation system for use in digitally...

H - Electricity – 03 – C

Patent

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H03C 1/60 (2006.01) H03D 1/00 (2006.01) H04J 11/00 (2006.01) H04L 27/04 (2006.01)

Patent

CA 2289537

A modulation circuit (10) converts input data in a symbol generator (100) to M symbol values which are converted in in-phase and quadrature phase generators (200, 250) to M in-phase and M quadrature phase time domain samples which are combined in a modulator (290) to generate a single-sideband modulated signal. The in-phase and quadrature phase generators (200, 250) include transform circuits (210, 310) and polyphase filters (220, 320). A demodulator (400) includes a memory (402) for storing the 2M most recently received time-domain values, a polyphase filter bank (404), a polyphase processor (406) and a transform circuit (408).

L'invention concerne un circuit de modulation (10) convertissant des données d'entrée situées dans un générateur de symboles (100) en M valeurs de symbole qui sont converties, dans des générateurs en phase et en quadrature (200, 250), en M échantillons temporels en phase et en M échantillons temporels en quadrature qui sont combinés dans un modulateur (290) pour générer un signal modulé à bande latérale unique. Les générateurs en phase et en quadrature (200, 250) comportent des circuits de transformation (210, 310) et des filtres polyphasés (220, 320). Un démodulateur (400) comprend une mémoire (402) pour mémoriser les 2 M valeurs temporelles reçues le plus récemment, un ensemble de filtres polyphasés (404), un processeur polyphasé (406) et un circuit de transformation (408).

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