Apparatus and method for compensating for analog quadrature...

Details Apparatus and method for compensating for analog quadrature... Apparatus and method for compensating for analog quadrature...

2006-05-02

2006-05-02

Ha, Dac V. (Department: 2634)

Pulse or digital communications

Transmitters

Antinoise or distortion

C375S285000, C455S063300, C455S115200, C330S011000, C330S259000, C330S290000

Reexamination Certificate

active

07039124

ABSTRACT:
An apparatus and method for compensating for an analog quadrature modulation (AQM) error in a linearization apparatus for AQM-modulating a digital predistorted signal and outputting the AQM-modulated signal through a high-power amplifier. In the apparatus and method, a gain/phase error estimator predicts a gain/phase imbalance error caused by AQM on the predistorted signal. A Direct Current (DC) offset estimator predicts a DC offset for a feedback signal from the high-power amplifier. An error compensator compensates for the digital predistorted signal for a DC offset signal output from the DC offset estimator, and then compensates for a gain/phase error output from the gain/phase error estimator.

REFERENCES:
patent: 5929704 (1999-07-01), Proctor et al.
patent: 6429738 (2002-08-01), Kenington
patent: 6885242 (2005-04-01), Leffel et al.

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