Pulse cancellation crest factor reduction
AssigneeNXP USA, Inc.
InventorsDan-Teodor Toma, Mihai-Ionut Stanciu, Florin Cristian Badea
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Abstract
A transmitter reduces the Crest Factor of an input signal by identifying potentially hidden peaks and by efficiently identifying the delay between an observed peak at a specified sampling rate and a corresponding true peak generated after upsampling. The transmitter rescales, based on a programmable rescaling parameter, a threshold for peak detection, and employs the rescaled threshold to identify one or more candidate peaks of the input signal. After the transmitter has rescaled the one or more candidate peaks based on the estimated fractional delay between the candidate peaks and the corresponding true peaks, the peaks are reevaluated based on the original threshold.
Claims20
A method comprising:
- identifying a first threshold based on an average power level of an input signal;
- rescaling the first threshold to generate a second threshold;
- identifying a peak of the input signal based on the second threshold;
- and
- reducing a crest factor of the input signal based on the identified peak.
A method, comprising:
- receiving an input signal comprising a plurality of input samples including a first sample;
- identifying a peak of the input signal based on the first sample and immediately neighboring samples of the first sample in the plurality of input samples;
- and
- reducing a crest factor of the input signal based on the identified peak.
A transmitter, comprising:
- a peak detection module configured to:
- identify a first threshold, the first threshold based on an average power level of an input signal;
- rescale the first threshold to generate a second threshold;
- and
- identify a peak of the input signal based on the second threshold;
- and
- an adder configured to reduce a crest factor of the input signal based on the identified peak.
Dependencies are inferred from the claim text.