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:
Jan. 15, 2019
Filed:
Oct. 08, 2015
Telefonaktiebolaget L M Ericsson (Publ), Stockholm, SE;
Torsten John Carlsson, Lund, SE;
Telefonaktiebolaget LM Ericsson (publ), Stockholm, SE;
Abstract
Crest factor reduction techniques and apparatus provide good performance while reducing the impact to power consumption and implementation cost. An example method begins with identifying multiple non-overlapping and separated signal segments in a signal made up of a sequence of digital signal values, each identified segment being an interval in which at least one the digital signal values exceeds a predetermined threshold. For each identified signal segment, an overshoot vector representing the extent by which the identified signal segment exceeds the predetermined threshold is calculated. Each overshoot vector is separately filtered with a digital filter having one or more passbands corresponding to in-band portions of the signal. Each filtered overshoot vector is separately scaled, in some embodiments, and each scaled, filtered, overshoot vector is subtracted from the corresponding portion of the signal, to obtain a compensated signal having a reduced crest factor.