| 摘要 |
A method and an arrangement for determining correction parameters used for correcting phase and amplitude imbalance of an I/Q modulator in a transmitter, which transmitter comprises an I/Q modulator (7) for I/Q-modulating a signal to be transmitted and a corrector (4) for correcting the phase and amplitude imbalance caused by the I/Q modulator according to the correction parameters, the arrangement comprising means (9) for sampling the I/Q-modulated test signal to be transmitted, which is formed from I- and Q-test signals fed into the transmitter, means (14) for A/D-converting the signal samples taken from the test signal to be transmitted, means (15) for I/Q-demodulating the signal samples digitally into I- and Q-feedback signals, means (17) for determining the phase and amplitude imbalance caused by the I/Q modulator on the basis of the I- and Q-feedback signals, and means (17) for determining the correction parameters of phase and amplitude on the basis of the determined phase and amplitude imbalance.
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