Modeling Digital Predistorter
First Claim
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1. A method of compensating for distortions introduced by an electronic device, comprising:
- receiving an input signal to a predistorter and an output signal from the electronic device;
generating a first set of model coefficients based on a first predistorter model used in an adaptation circuit, the input signal to the predistorter, and the output signal;
generating a second set of model coefficients for a second predistorter model by applying a conversion function to the first set of model coefficients, wherein the second predistorter model is used by the predistorter;
adapting the predistorter based on the second set of model coefficients; and
predistorting input signals to the predistorter based on the second predistorter model.
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Abstract
Methods and apparatus are disclosed for predistorting an input signal to compensate for non-linear distortions introduced by an electronic device, for example, a power amplifier. The non-linear effects of a power amplifier can be modeled using different behavior models. Coefficients for one behavior model can be converted into coefficients for a different behavior model using a conversion function. A conversion circuit implementing the conversion function can be used in between a predistorter and an adaptation circuit that use different models.
21 Citations
16 Claims
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1. A method of compensating for distortions introduced by an electronic device, comprising:
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receiving an input signal to a predistorter and an output signal from the electronic device; generating a first set of model coefficients based on a first predistorter model used in an adaptation circuit, the input signal to the predistorter, and the output signal; generating a second set of model coefficients for a second predistorter model by applying a conversion function to the first set of model coefficients, wherein the second predistorter model is used by the predistorter; adapting the predistorter based on the second set of model coefficients; and predistorting input signals to the predistorter based on the second predistorter model. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A circuit for compensating for distortions introduced by an electronic device to produce a predistorted input signal, wherein the electronic device operates on an input signal to a predistorter, said circuit comprising:
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an adaptation circuit configured to compute a first set of model coefficients for a first predistorter model from the input signal to the predistorter; a coefficient conversion circuit configured to generate a second set of model coefficients for a second predistorter model from the first set of model coefficients; and a modeling circuit configured to adapt the predistorter based on the second set of model coefficients. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification