Invention Grant
- Patent Title: IQ-imbalance
- Patent Title (中): 智商失衡
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Application No.: US10482254Application Date: 2002-06-25
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Publication No.: US07336730B2Publication Date: 2008-02-26
- Inventor: Tommi Auranen , Juha Kajava
- Applicant: Tommi Auranen , Juha Kajava
- Applicant Address: FI Espoo
- Assignee: Nokia Corporation
- Current Assignee: Nokia Corporation
- Current Assignee Address: FI Espoo
- Agency: Alston & Bird LLP
- Priority: FI20011426 20010629
- International Application: PCT/FI02/00555 WO 20020625
- International Announcement: WO03/003686 WO 20030109
- Main IPC: H03K9/00
- IPC: H03K9/00

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.
Public/Granted literature
- US20040156450A1 Iq-imbalance Public/Granted day:2004-08-12
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