Device and method for adaptive digital pre-distortion
First Claim
1. A system, comprising:
- a pre-distortion unit configured to pre-distort an input signal based on a model parameter by directly computing an inverse of a power amplifier model in an iterative fashion and configured to alternate between computing the inverse and updating the model parameter, thereby providing a pre-distorted signal, wherein the pre-distortion unit calculates the pre-distorted signal according to the following function;
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Accused Products
Abstract
One embodiment relates to a system which includes a pre-distortion unit, a power amplifier circuit, a power amplifier model, and a parameter estimation unit. The pre-distortion unit is configured to pre-distort an input signal based on a model parameter by directly computing the model inverse in an iterative fashion, thereby providing a pre-distorted signal. The power amplifier circuit is configured to amplify the pre-distorted signal. The power amplifier model is configured to model amplification of the pre-distorted signal by the power amplifier circuit based on the pre-distorted signal and the model parameter. Based on the pre-distorted signal and an error signal, the parameter estimation unit is configured to update the model parameter provided to the pre-distortion unit and the power amplifier model. The error signal represents a difference between an output signal from the power amplifier circuit and a modeled output signal from the power amplifier model.
53 Citations
20 Claims
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1. A system, comprising:
a pre-distortion unit configured to pre-distort an input signal based on a model parameter by directly computing an inverse of a power amplifier model in an iterative fashion and configured to alternate between computing the inverse and updating the model parameter, thereby providing a pre-distorted signal, wherein the pre-distortion unit calculates the pre-distorted signal according to the following function; - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system, comprising:
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a pre-distortion unit configured to pre-distort an input signal based on a model parameter, thereby providing a pre-distorted signal, wherein the pre-distortion unit calculates the pre-distorted signal according to a sum of memory polynomials and memoryless polynomials which are tuned based on the model parameter, wherein the memoryless polynomials are calculated using a first clock having a first clock frequency and wherein the memory polynomials are calculated using a second clock having a second clock frequency, the first clock frequency being greater than the second clock frequency; a frequency up-conversion element to up-convert a frequency of the pre-distorted signal, thereby providing an up-converted pre-distorted signal; a power amplifier circuit configured to amplify the up-converted pre-distorted signal, thereby providing an up-converted output signal; a power amplifier model configured to model the amplification of the up-converted pre-distorted signal by the power amplifier based on the pre-distorted signal and the model parameter; and a feedback path coupling an output of the power amplifier circuit to the pre-distortion unit and power amplifier model, wherein the feedback path comprises; a down-conversion element to down-convert the up-converted output signal, thereby providing a down-converted output signal; wherein the feedback path is configured to update the model parameter based on a difference between the down-converted output signal and a modeled amplified output signal from the power amplifier model. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A system, comprising:
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a pre-distortion unit configured to pre-distort an input signal based on a model parameter, thereby providing a pre-distorted signal, wherein the pre-distortion unit calculates the pre-distorted signal according to a sum of memory polynomials and memoryless polynomials which are tuned based on the model parameter, wherein the memoryless polynomials are calculated using a first clock having a first clock frequency and wherein the memory polynomials are calculated using a second clock having a second clock frequency, the first clock frequency being greater than the second clock frequency; a non-linear circuit configured to process the pre-distorted signal; a non-linear circuit model configured to model the processing of the pre-distorted signal by the non-linear circuit based on the pre-distorted signal and the model parameter; and a feedback path coupling an output of the non-linear circuit to the pre-distortion unit and non-linear circuit model, wherein the feedback path is configured to update the model parameter based on a difference between an output signal from the non-linear circuit and a modeled output signal from the non-linear circuit model, and provide the updated model parameter directly to the pre-distortion unit and directly to the non-linear circuit model from a parameter estimation unit located on the feedback path.
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19. A method of wireless data transmission, comprising:
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receiving an input signal; pre-distorting the input signal based on a model parameter, h, thereby obtaining a pre-distorted signal, wherein the pre-distorted signal is calculated according to the following function; - View Dependent Claims (20)
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Specification