Digital predistorter for variable supply amplifier
First Claim
1. An adaptive predistorter for applying a predistortion gain to an input signal to be amplified by a power amplifier having a variable supply voltage, the predistorter comprising:
- a predistortion gain block adapted to apply a complex gain to a complex input signal;
a first table implemented in a first memory and comprising a 2-dimensional array of cells storing complex gain values, the first table adapted to output said complex gain values based on an amplitude of the input signal and the value of the variable supply voltage of the power amplifier; and
a second table implemented in a second memory and comprising a 2-dimensional array of cells storing gain update values for updating the complex gain values of the first table, the gain update values being generated based on an output signal of said power amplifier.
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Abstract
An adaptive predistorter for applying a predistortion gain to an input signal to be amplified by a power amplifier having a variable supply voltage, the predistorter including: a predistortion gain block adapted to apply a complex gain to a complex input signal; a first table implemented in a first memory and including a 2-dimensional array of cells storing complex gain values, the first table adapted to output the complex gain values based on an amplitude of the input signal and the value of the variable supply voltage of the power amplifier; and a second table implemented in a second memory and including a 2-dimensional array of cells storing gain update values for updating the complex gain values of the first table, the gain update values being generated based on an output of the power amplifier.
8 Citations
26 Claims
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1. An adaptive predistorter for applying a predistortion gain to an input signal to be amplified by a power amplifier having a variable supply voltage, the predistorter comprising:
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a predistortion gain block adapted to apply a complex gain to a complex input signal; a first table implemented in a first memory and comprising a 2-dimensional array of cells storing complex gain values, the first table adapted to output said complex gain values based on an amplitude of the input signal and the value of the variable supply voltage of the power amplifier; and a second table implemented in a second memory and comprising a 2-dimensional array of cells storing gain update values for updating the complex gain values of the first table, the gain update values being generated based on an output signal of said power amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of applying a predistortion gain to a complex input signal to be amplified by a power amplifier having a variable supply voltage, comprising:
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applying to the complex input signal, by a predistortion gain block, complex gain values extracted from a first table comprising a 2-dimensional array of cells storing complex gain values, said complex gain values being extracted based on an amplitude of the complex input signal, and a value of the variable supply voltage of the power amplifier; and accumulating in a 2-dimensional array of a second table gain update values for updating the complex gain values of the first table, the gain update values being generated based on an output signal of said power amplifier. - View Dependent Claims (14)
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15. A digital predistorter comprising:
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a predistortion gain block configured to apply a complex gain value to a complex input signal to be amplified by a power amplifier and to output a predistorted signal to the power amplifier; a first table configured to store complex gain values and to output a selected complex gain value to the predistortion gain block based on an amplitude of the input signal and a value of a variable supply voltage of the power amplifier; and a second table configured to store gain update values for updating the complex gain values in the first table based on an output signal of the power amplifier. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
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24. A digital predistortion method comprising:
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storing, in a first table, complex gain values; applying, by a predistortion gain block, to a complex input signal to be amplified by a power amplifier, a complex gain value selected from the first table based on an amplitude of the input signal and a value of a variable power supply of the power amplifier; storing, in a second table, gain update values based on an output signal of the power amplifier; and updating, by a table update block, the complex gain values in the first table based on the gain update values in the second table. - View Dependent Claims (25, 26)
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Specification