Title: Corrective phase quadrature modulator system and method
Application Number: 02825236 Application Date: 2002.11.25
Publication Number: 1605152 Publication Date: 2005.04.06
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H03C3/00,H03C1/06,H04L27/36
Applicant(s) Name: Harris Corp. Address:
Inventor(s) Name:
Attorney & Agent: li deshan
Abstract:
     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.
Time: 9