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:
Mar. 05, 2013
Filed:
Oct. 19, 2009
Masahiko Onishi, Osaka, JP;
Masahiko Onishi, Osaka, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
A distortion compensation circuit capable of realizing highly accurate distortion compensation by updating a model even under a situation in which the appearance frequency of an input signal having a maximum value is low. A DPD processorincludes an inverse model estimation unit, which estimates an inverse model for a model expressing input-output characteristics of an HPAbased on an input signal Sto the HPAand an output signal Sfrom the HPA, a distortion compensation unit, which compensates for distortion of the input-output characteristics by adding the inverse model to the input signal S, and a sampling circuit, which samples the signals Sand Sin a predetermined time immediately before the sampling and inputs the signals Sand Sto the inverse model estimation unit. The inverse model estimation unitupdates the inverse model based on Sand Sinput from the sampling circuitregardless of whether the maximum value that the input signal Scan take is included in a range sampled by the sampling circuit
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