Method and apparatus for generating plural quadrature...

H - Electricity – 04 – L

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H04L 27/20 (2006.01) H04J 1/05 (2006.01) H04L 5/06 (2006.01) H04L 27/36 (2006.01)

Patent

CA 2211093

A transmitter includes a combiner (102) for combining plural data signal sets (I1, Q1; I2, Q2) into a single set of data signals (I', Q'). An I/Q modulator (106) modulates the single sets of data signals onto for example an intermediate frequency (IF) carrier signal. A frequency upconverter converts the frequency of the IF signal to a radio frequency signal which, when amplified in a power amplifier, is transmitted via antenna. Using the present invention, plural sets of quadrature modulated signals separated in frequency are transmitted on a single RF carrier rather than on two carriers.

Un émetteur comprend un circuit mélangeur (102) pour combiner plusieurs ensembles de signaux de données (I1, Q1; I2, Q2) en un seul ensemble de signaux de données (I', Q'). Un modulateur I/Q (106) module les ensembles individuels de signaux de données sur un signal de porteuse à fréquence intermédiaire, par exemple. Un transposeur de fréquences convertit la fréquence d'un signal de fréquence intermédiaire en un signal de haute fréquence qui, une fois amplifié dans un amplificateur de puissance, est transmis par une antenne. Selon la présente invention, plusieurs ensembles de signaux modulés en quadrature, de fréquence différente, sont transmis sur une seule porteuse haute fréquence et non plus sur deux porteuses.

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