| 摘要 |
The invention relates to a method for adjusting IQ-imbalance of a direct conversion receiver ( 200 ). In the method a radio frequency training signal is locally generating and conveyed to an in-phase branch and a quadrature-phase branch of the receiver ( 200 ). The method comprises mixing, in the analogue domain, the radio frequency training signal of the in-phase branch with a first mixing signal to form a baseband in-phase component (I) of the training signal and mixing, in the analogue domain, the radio frequency training signal of the quadrature-phase branch with a second mixing signal to form a phase shifted component (Q) of the training signal. The baseband in-phase component (I) and phase shifted component (Q) are analogue-to-digital converted to form a digital baseband in-phase component and a digital baseband phase shifted component of the training signal. In the method the digital baseband in-phase and phase shifted components of the training signal are analyzed, in a digital demodulator ( 210 ), so as to detect the IQ-imbalance of the direct conversion receiver ( 200 ). The IQ-imbalance is corrected, based on the analysis, in the analogue domain.
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