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US 12,176,934 B2Granted
Predistortion circuit, method for generating a predistorted baseband signal, control circuit for a predistortion circuit, method to determine parameters for a predistortion circuit, and apparatus and method for predistorting a baseband signal
AssigneeApple Inc.
InventorsAndreas Menkhoff, Gunther Kraut, Andreas Langer
Life of this patent
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Abstract
A predistortion circuit for a wireless transmitter includes a signal input configured to receive a baseband signal. Further, the predistortion circuit includes a predistorter configured to generate a predistorted baseband signal using the baseband signal and a select of one of a first predistorter configuration and a second predistorter configuration.
Claims20
A predistortion circuit comprising:
- a first sub-circuit configured to calculate a first part of a predistorted baseband signal based on a received baseband signal and generate a corresponding first predistorted baseband signal having a first sampling rate, wherein the first sampling rate is based on a first bandwidth of the first predistorted baseband signal, wherein the first predistorted baseband signal comprises the received baseband signal with first nonlinearities inversely superimposed on the received baseband signal, and
- a second sub-circuit configured to calculate a second part of the predistorted baseband signal based on the received baseband signal and generate a corresponding second predistorted baseband signal having a second sampling rate different from the first sampling rate, wherein the second sampling rate is based on a second bandwidth of the second predistorted baseband signal, wherein the second predistorted baseband signal comprises the received baseband signal with second nonlinearities inversely superimposed on the received baseband signal,
- wherein the predistortion circuit is configured to produce the predistorted baseband signal based on one or more of the first predistorted baseband signal and the second predistorted baseband signal.
A method for generating a predistorted baseband signal, the method comprising:
- calculating a first part of a predistorted baseband signal based on a received baseband signal and generating a corresponding first predistorted baseband signal having a first sampling rate, wherein the first sampling rate is based on a first bandwidth of the first predistorted baseband signal, wherein the first predistorted baseband signal comprises the received baseband signal with first nonlinearities inversely superimposed on the received baseband signal;
- calculating a second part of the predistorted baseband signal based on the received baseband signal and generating a corresponding second predistorted baseband signal having a second sampling rate different from the first sampling rate, wherein the second sampling rate is based on a second bandwidth of the second predistorted baseband signal, wherein the second predistorted baseband signal comprises the received baseband signal with second nonlinearities inversely superimposed on the received baseband signal;
- and
- producing the predistorted baseband signal based on one or more of the first predistorted baseband signal and the second predistorted baseband signal.
1 more element
A wireless device comprising:
- at least one antenna;
- and
- a transmitter circuit coupled to the at least one antenna and configured to
- calculate a first part of a predistorted baseband signal based on a received baseband signal and generate a corresponding first predistorted baseband signal having a first sampling rate, wherein the first sampling rate is based on a first bandwidth of the first predistorted baseband signal, wherein the first predistorted baseband signal comprises the received baseband signal with first nonlinearities inversely superimposed on the received baseband signal,
- calculate a second part of the predistorted baseband signal based on the received baseband signal and generate a corresponding second predistorted baseband signal having a second sampling rate different from the first sampling rate, wherein the second sampling rate is based on a second bandwidth of the second predistorted baseband signal, wherein the second predistorted baseband signal comprises the received baseband signal with second nonlinearities inversely superimposed on the received baseband signal, and
- produce the predistorted baseband signal based on one or more of the first predistorted baseband signal and the second predistorted baseband signal.
3 more elements
Dependencies are inferred from the claim text.