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:
Oct. 12, 2010
Filed:
Jun. 16, 2009
Hui LI, Beijing, CN;
Zhan Shi, Beijing, CN;
Jianmin Zhou, Beijing, CN;
Fujitsu Limited, Kawasaki, JP;
Abstract
The present invention discloses a predistortion apparatus, a predistortion system and a predistortion method. The predistorter comprises a modular value calculating section, for performing modular arithmetic on an information source input signal inputted from an information source; an orthogonal lookup table value acquiring section, for searching N stored lookup tables orthogonal to one another, finding out corresponding output of each lookup table in accordance with the modular value of the information source input signal, and acquiring N lookup table values, wherein N is an integer greater than 1; a multiplying section, for multiplying the N lookup table values acquired by the orthogonal lookup table value acquiring section with N amplitude adjustment factors to obtain N amplitude adjustment values, and multiplying the N lookup table values with N phase adjustment factors to obtain N phase adjustment values; and a summating section, for summating the N amplitude adjustment values to obtain an amplitude predistortion value, and summating the N phase adjustment values to obtain a phase predistortion value.