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US 8,428,179 B1Granted
Apparatus and method for crest factor reduction
AssigneeAltera Corporation
InventorsLei Xu, Michael Fitton
Life of this patent
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Abstract
Embodiments of the present invention provide an apparatus and method for crest factor reduction, in which an input time domain signal is clipped to generate a clipped signal and a difference signal, and processing operations are carried out on the difference signal, before the processed difference signal is combined with the clipped signal to generate an output time domain signal.
Claims28
A crest factor reduction apparatus, the apparatus comprising:
- a difference calculation block which is configured to decompose an input time domain signal into a clipped signal comprising that portion of the input signal having a magnitude which is equal to or less than a threshold and a difference signal comprising that portion of the input signal which exceeds the threshold;
- a first transformation block coupled to the difference calculation block and configured to convert the time domain difference signal into a frequency domain difference signal;
- a processing block which is configured to apply a magnitude constraint to the frequency domain difference signal to generate a constrained frequency domain difference signal;
- a second transformation block coupled to the processing block and configured to convert the constrained frequency domain difference signal into a time domain signal;
- and
- an adder block which is configured to combine the time domain signal produced by the second transformation block with the clipped signal to generate an output time domain signal.
3 more elements
A method for processing an input time domain signal, the method comprising:
- decomposing the input time domain signal into a clipped signal comprising that portion of the input signal having a magnitude which is equal to or less than a threshold and a difference signal comprising that portion of the input signal having a magnitude which exceeds the threshold;
- converting the time domain difference signal into a frequency domain difference signal;
- applying a magnitude constraint to the frequency domain difference signal to generate a constrained frequency domain difference signal;
- converting the constrained frequency domain difference signal into a time domain signal;
- and
- combining the time domain signal so produced with the clipped signal to generate an output time domain signal.
3 more elements
Dependencies are inferred from the claim text.