Adjusting a receiver

Details Adjusting a receiver Adjusting a receiver

2007-06-19

2007-06-19

Tran, Khanh (Department: 2611)

Pulse or digital communications

Receivers

C455S326000

Reexamination Certificate

active

10184110

ABSTRACT:
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.

REFERENCES:
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patent: 6208698 (2001-03-01), Marchesani et al.
patent: 6377620 (2002-04-01), Ozluturk et al.
patent: 6483388 (2002-11-01), Khan
patent: 6490326 (2002-12-01), Bastani et al.
patent: 6725024 (2004-04-01), Lindoff et al.
patent: 1009101 (1999-11-01), None
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Search Report dated Apr. 10, 2002.

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