The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 11, 2014
Filed:
Dec. 08, 2011
Terrance W. Charbonneau, Fort Wayne, IN (US);
Terrance W. Charbonneau, Fort Wayne, IN (US);
Exelis Inc., McLean, VA (US);
Abstract
A technique for applying crest factor reduction to a signal involves identifying peaks of an oversampled digital signal that exceed a threshold and generating a correction waveform corresponding to a sequence of correction pulses for respective peaks. The correction waveform is applied to the oversampled digital signal via a delta-sigma modulator to generate an oversampled digital output signal with reduced peaks. The delta-sigma modulator causes most of the energy of the correction waveform in the oversampled digital output signal to fall outside a frequency band of the oversampled digital signal. The oversampled digital output signal is low pass filtered to remove energy outside the frequency band of the oversampled digital signal such that noise introduced into the oversampled digital output signal by the correction waveform is reduced. The oversampled digital output signal is down sampled to produce a digital output signal with a lower sampling rate.