One bit digital quadrature vector modulator

Details One bit digital quadrature vector modulator One bit digital quadrature vector modulator

H - Electricity

04

L

H04L 27/20 (2006.01) H03M 3/02 (2006.01) H04L 27/36 (2006.01)

Patent

CA 2245072

A One Bit Digital Quadrature Vector Modulator (DQVM) and a method of generating single sideband output signals are useful for a wide range of radio frequency, signal processing and wireless applications. The DQVM simplifies the necessary digital multiplication by using noise shaped one bit versions of both the baseband I B and Q B signals to be modulated and the I LO and Q LO modulating signals. The one bit DQVM enables a much faster digital implementation of the digital quadrature vector modulation function than can be achieved with conventional multi-bit digital techniques. In addition the single sideband upconversion of the DQVM achieves high suppression of the unwanted sideband by applying an offset to one of the low speed input samples. Digital vector modulators are an improvement over conventional analog vector modulators as they are not subject to the amplitude and phase matching problems inherent in analog vector modulators.

Un modulateur vectoriel numérique en quadrature (DQVM) monobit et une méthode de production de signaux de sortie à bande latérale unique sont utiles pour une large gamme d'applications RF, de traitement de signaux et sans fil. Le DQVM simplifie la multiplication numérique nécessaire en utilisant des versions monobit à bruit modelé des signaux de bande de base I B et Q B à moduler et des signaux de modulation I LO et Q LO. Le DQVM monobit permet d'exécuter numériquement la fonction de modulation vectorielle numérique en quadrature de façon beaucoup plus rapide que ne le permettent les techniques numériques multibits traditionnelles. En outre, la conversion-élévation à bande latérale unique du DQVM permet une forte suppression de la bande latérale non désirée, par décalage d'un des échantillons d'entrée à faible vitesse. Les modulateurs vectoriels numériques constituent une amélioration par rapport aux modulateurs vectoriels analogiques.

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