Receiver I-Q balance calibration

Details Receiver I-Q balance calibration Receiver I-Q balance calibration

2008-12-30

2011-11-01

Ahn, Sam K (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Angle modulation

Reexamination Certificate

active

08050350

ABSTRACT:
In an I-Q receiver, I-Q baseband mixer receives a real signal, and outputs an in-phase baseband information signal and a quadrature baseband information signal, a decoupling compensator multiplies in-phase baseband information signal and the quadrature baseband information signal by a trained decoupling matrix that, based on adaptive training in response to purely in-phase and purely quadrature phase training signals, decouples the in-phase baseband information signal from a quadrature component of the I-Q signal, and decouples quadrature-phase baseband information signal from an in-phase component of the I-Q signal. Optionally, a trained I-arm-Q-arm imbalance compensator performs a filter compensation on one or both of the decoupled in-phase baseband signal and the quadrature-phase baseband signal output by the trained decoupling matrix. Optionally, the filter is trained based on training signals generated by inputting equal in-phase and quadrature phase training signals to the I-Q baseband mixer, and multiplying the result by the trained decoupling matrix.

REFERENCES:
patent: 6895045 (2005-05-01), Ozluturk et al.
patent: 2007/0189371 (2007-08-01), Yen
Xing et al., “Frequency Offset and I/Q Imbalance Compensation for Direct-Conversion Receivers”, IEEE Tranactions on Wireless Comm., vol. 4, No. 2, Mar. 2005.

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