Distortion compensation apparatus and distortion compensation method
AssigneeFujitsu Limited
InventorAlexander Nikolaevich Lozhkin
Life of this patent
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Abstract
A predistorter gives an input signal inputted to a power amplifier distortion corresponding to a compensation coefficient. A band limiter limits components in a second frequency band other than a first frequency band of a feedback signal fed back from the power amplifier, and distorts components in the first frequency band according to the limited components in the second frequency band. A learner updates the compensation coefficient on the basis of the distorted feedback signal.
Claims5
A distortion compensation apparatus comprising:
- a predistorter which gives an input signal inputted to a power amplifier distortion corresponding to a compensation coefficient;
- a first band limiter which
- limits components in a second frequency band other than a first frequency band of a feedback signal fed back from the power amplifier,
- converts the components in the second frequency band to signals belonging to the first frequency band, and
- combines the signals with components in the first frequency band of the feedback signal;
- and
- a learner which updates the compensation coefficient on the basis of the feedback signal combined with the signals.
A distortion compensation method for compensating distortion caused by a power amplifier, by using a predistorter, the method comprising:
- limiting components in a second frequency band other than a first frequency band of a feedback signal fed back from the power amplifier,
- converting the components in the second frequency band to signals belonging to the first frequency band, and
- combining the signals with components in the first frequency band of the feedback signal;
- and
- updating, on the basis of the feedback signal combined with the signals, a compensation coefficient which corresponds to distortion given by the predistorter to an input signal inputted to the power amplifier.
Dependencies are inferred from the claim text.