Adaptive predistorter coupled to a nonlinear element
AssigneeInfineon Technologies AG
InventorsPeter Singerl, Heinz Koeppl
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Abstract
In one embodiment, a circuit comprises an adaptive predistorter and a nonlinear element coupled to an output of the predistorter. The predistorter is operative to predistort an input signal according to predistortion control parameters at a given sampling rate. The circuit further comprises an identification unit and a translation unit. The identification unit identifies nonlinearity parameters representing the nonlinearity of the nonlinear element by sampling the output of the nonlinear element at an identification sampling rate lower than twice a bandwidth at the output of the nonlinear element. The translation unit translates the identified nonlinearity parameters into the predistortion control parameters. Other systems and methods are disclosed.
Claims31
A circuit comprising:
- an adaptive predistorter to predistort an input signal according to a predistortion control parameter,
- a nonlinear element coupled to an output of the predistorter, the output having a bandwidth,
- an identification unit to identify a nonlinearity parameter representing the nonlinearity of the nonlinear element and to sample the output of the nonlinear element at an identification sampling rate lower than twice the bandwidth at the output of the nonlinear element, and
- a translation unit to translate the nonlinearity parameter into the predistortion control parameter.
A circuit, comprising:
- an adaptive predistorter to predistort an input signal according to predistortion control parameters, and
- a nonlinear element coupled to an output of the predistorter,
- wherein the predistortion control parameters are calculated by identifying nonlinearity parameters representing the nonlinearity of the nonlinear element by sampling the output of the nonlinear element at an identification sampling rate lower than twice the bandwidth at the output of the nonlinear element, and translating the identified nonlinearity parameters into the predistortion control parameters.
A circuit comprising:
- means for adaptively predistorting an input signal according to predistortion control parameters, and
- means for nonlinearly processing a signal, an input of which being coupled to an output of the means for adaptively predistorting the input signal,
- wherein the means for adaptively predistorting the input signal comprises a parallel structure of a delay stage and a cascade of an adaptive nonlinear stage and an adaptive linear stage.
A method to calculate predistortion control parameters of an adaptive predistorter coupled to an input of a nonlinear element, comprising:
- identifying nonlinearity parameters representing nonlinearity of the nonlinear element by sampling an output of the nonlinear element at an identification sampling rate lower than twice a bandwidth at the output of the nonlinear element, and
- translating the identified parameters into the predistortion control parameters.
A method to produce a linearized signal output from a nonlinear element coupled to the output of an adaptive predistorter, comprising:
- identifying parameters representing Volterra kernels of the nonlinear element by sampling the output of the nonlinear element at an identification sampling rate lower than twice a bandwidth at the output of the nonlinear element,
- translating the identified parameters into predistortion control parameters, and
- inputting the predistortion control parameters into the adaptive predistorter.
Dependencies are inferred from the claim text.