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:
Apr. 04, 2006
Filed:
Feb. 19, 2003
Yuzo Kurokami, Tokyo, JP;
Yuzo Kurokami, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
Ideal nonlinear distortion compensation is realized by removing an imperfection of amplitude delay characteristic and an affection of inherent deviation that an amplifier has. A linear distortion compensation factor calculating part () estimates, based on quadrature demodulated signals (I'ch, Q′ch), the linear distortion characteristic occurring mainly due to imperfection of analog circuits, such as a quadrature modulator () and a high-power amplifier (), and calculates and outputs a linear distortion compensation factor for compensating the linear distortion. A linear distortion compensating part () performs a pre-distortion (addition of a reverse characteristic of the linear distortion characteristic) by multiplying the baseband signals (Ich, Qch) by the data of the linear distortion compensation factor.