Corrective phase quadrature modulator system and method

Details Corrective phase quadrature modulator system and method Corrective phase quadrature modulator system and method

H - Electricity

04

L

H04L 27/36 (2006.01) H03C 1/06 (2006.01) H03C 3/00 (2006.01) H03C 5/00 (2006.01)

Patent

CA 2468079

A system and method for producing a phase corrected M-QAM signal is described. In one embodiment, a phase-correcting M-QAM modulator comprises a feedback loop for dynamically adjusting the phase relationship between the two carrier signals as a function of the difference between the phase relationship of the two carrier signals and the phase relationship of the I and Q input signals. In another embodiment where a second carrier signal is derived from the first carrier signal by means of a phase shifting circuit, the amount of phase shift applied to the first carrier signal is a function of the difference between the phase relationship of the two component signals comprising the output QAM signal and the phase relationship between the input I and Q signals.

Système et procédé pour produire un signal M-QAM corrigé en phase. Dans un mode de réalisation, un modulateur M-QAM à correction de phase comprend une boucle de rétroaction destinée à ajuster dynamiquement le rapport de phases entre deux porteuses, pris comme une fonction de la différence entre le rapport de phases des deux porteuses et le rapport de phases des signaux d'entrée I et Q. Dans un autre mode de réalisation, lorsqu'une deuxième porteuse est dérivée de la première porteuse au moyen d'un circuit de décalage de phase, l'ampleur du décalage de phase appliqué à la première porteuse est une fonction de la différence entre le rapport de phases des deux signaux de composants comprenant le signal QAM émis et le rapport de phases des signaux d'entrée I et Q.

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