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. 02, 2010
Filed:
Oct. 12, 2005
Shinji Mizuta, Yokohama, JP;
Yasunori Suzuki, Yokohama, JP;
Shoichi Narahashi, Yokohama, JP;
NTT DoCoMo, Inc., Tokyo, JP;
Abstract
A predistorter includes: a divider that divides an input signal and supplies the divided input signal to a linear transmission path and a distortion generating path; a (2k−1)th-order distortion generator that raises the signal supplied to the distortion generating path to the (2k−1)th power to generate a distortion component; a vector adjuster that adjusts the amplitude and phase of the output of the (2k−1)th-order distortion generator; and an adder that sums up the output of the vector adjuster and the output of the linear transmission path to generate a predistorted signal r(t), in which the (2k−1)th-order distortion generator comprises: a (2k−1)th-order multiplier (B) that raises the divided signal to the (2k−1)th power; a lower-than-(2k−1)th-order multiplier (BBB) that raises the divided signal to the 5th, 3rd and 1st power, respectively; a vector adjuster (CCC) that adjusts the amplitude and phase of the output of the lower-than-(2k−1)th-order multiplier; and an adder (D) that sums up the output of the vector adjuster and the output of the (2k−1)th-order multiplier.