Method and apparatus to remove effects of I-Q imbalances of...

Details Method and apparatus to remove effects of I-Q imbalances of... Method and apparatus to remove effects of I-Q imbalances of...

2007-02-13

2007-02-13

Tran, Khanh (Department: 2611)

Pulse or digital communications

Receivers

C375S296000, C455S114300

Reexamination Certificate

active

09922019

ABSTRACT:
The present invention is a method and apparatus to remove the adverse effects due to the imbalance between in-phase (I) and quadrature (Q) channels for I-Q demodulators and modulators in multi-carrier systems. A first balancer generates a first balancing signal from a first signal of a first index corresponding to a first frequency. A first combiner combines the first balancing signal and a second signal of a second index corresponding to a second frequency. The second frequency is symmetrical to the first frequency with respect to a center frequency in a multi-carrier composite signal. The first combiner generates a first balanced signal corresponding to the second frequency.

REFERENCES:
patent: 5705949 (1998-01-01), Alelyunas et al.
patent: 5726973 (1998-03-01), Isaksson
patent: 6298096 (2001-10-01), Burgin
patent: 6668024 (2003-12-01), Andre
patent: 2002/0097812 (2002-07-01), Wiss et al.
Derwent, document No. 2002-520185, 1999 abstract.

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