Apparatus and method for compensating for analog quadrature modulation error
First Claim
1. An apparatus 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, the apparatus comprising:
- a gain/phase error estimator for predicting a gain/phase imbalance error caused by AQM on the predistorted signal;
a Direct Current (DC) offset estimator for predicting a DC offset from a feedback signal output from the high-power amplifier; and
an error compensator for compensating for the digital predistorted signal for a DC offset signal output from the DC offset estimator, and then compensating for a gain/phase error output from the gain/phase error estimator.
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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.
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Citations
20 Claims
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1. An apparatus 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, the apparatus comprising:
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a gain/phase error estimator for predicting a gain/phase imbalance error caused by AQM on the predistorted signal; a Direct Current (DC) offset estimator for predicting a DC offset from a feedback signal output from the high-power amplifier; and an error compensator for compensating for the digital predistorted signal for a DC offset signal output from the DC offset estimator, and then compensating for a gain/phase error output from the gain/phase error estimator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A 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, the method comprising the steps of:
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predicting a Direct Current (DC) offset from a feedback signal output from the high-power amplifier; compensating for the digital predistorted signal for the predicted DC offset; predicting a gain/phase imbalance error caused by AQM on the predistorted signal; and
compensating for the digital predistorted signal for the gain/phase imbalance error. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification