Correction of DC-offset of I/Q modulator

Details Correction of DC-offset of I/Q modulator Correction of DC-offset of I/Q modulator

2006-01-31

2006-01-31

Chin, Stephen (Department: 2634)

Pulse or digital communications

Transmitters

Antinoise or distortion

C375S319000

Reexamination Certificate

active

06993091

ABSTRACT:
A method and an arrangement for determining correction parameters used for correcting DC-offset of an I/Q modulator in a transmitter comprising an I/Q modulator and a corrector for correcting the DC-offset caused by the I/Q modulator are presented. The method comprises sampling the I/Q-modulated test signals, which are formed from I/Q-plane test vectors, A/D-converting the signal samples taken from the test signals, I/Q-demodulating the signal samples digitally into I- and Q-feedback signals, determining the DC-offset caused by the I/Q modulator on the basis of the test vectors and the feedback vectors caused by the test vectors and formed from the I- and Q-feedback signals, and determining the correction parameters of DC-offset on the basis of the determined DC-offset.

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