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Iq-imbalance




Title: Iq-imbalance.
Abstract: The invention relates to a method for correcting an IQ-imbalance (In-phase and Quadrature) of an IQ-based direct conversion receiver (200). In the method a group of radio frequency pilot signals are received in the direct conversion receiver (200). They are conveyed to an in-phase branch and a quadrature-phase branch of the receiver (200) and mixed, in the analogue domain, to form a baseband in-phase (I) and quadrature-phase (Q) signal components. The signal componets are conveyed to a digital demodulator (210) which detects the IQ-phase imbalance of the direct conversion receiver (200) by analysing at least one of the baseband in-phase (I) and the quadrature-phase (Q) signal components. In the method, the detected IQ-imbalance is corrected, in the analogue domain of the direct conversion receiver (200), to achieve a 90 degrees phase difference between a future baseband in-phase (I) signal component and a future baseband quadrature-phase (Q) signal component. ...


- Charlotte, NC, US
Inventors: Tommi Auranen, Juha Kajava
USPTO Applicaton #: #20080212711

The Patent Description & Claims data below is from USPTO Patent Application 20080212711, Iq-imbalance.

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Three phase and polarity encoded serial interface
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Method and apparatus for frequency division multiplexing
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stats Patent Info
Application #
US 20080212711 A1
Publish Date
09/04/2008
Document #
File Date
12/31/1969
USPTO Class
Other USPTO Classes
International Class
/
Drawings
0


Quadrature-phase

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20080904|20080212711|iq-imbalance|The invention relates to a method for correcting an IQ-imbalance (In-phase and Quadrature) of an IQ-based direct conversion receiver (200). In the method a group of radio frequency pilot signals are received in the direct conversion receiver (200). They are conveyed to an in-phase branch and a quadrature-phase branch of |