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. 16, 2013
Filed:
Feb. 01, 2011
Gang Sun, Beijing, CN;
Jianmin Zhou, Beijing, CN;
Zhan Shi, Beijing, CN;
Hui LI, Beijing, CN;
Zhiqi Wang, Beijing, CN;
Gang Sun, Beijing, CN;
JianMin Zhou, Beijing, CN;
Zhan Shi, Beijing, CN;
Hui Li, Beijing, CN;
Zhiqi Wang, Beijing, CN;
Fujitsu Limited, Kawasaki, JP;
Abstract
An adaptive digital predistortion device and method, the adaptive digital predistortion device including a predistortion unit for predistorting an input signal according to a predistortion parameter stored in a look-up table; a cost function generation unit for generating a cost function; a fixed segment point determination unit for determining a fixed segment point; and an update unit for updating parameters (u, u, k) according to the cost function to update the look-up table based on the updated parameters (u, u, k), wherein kis an updated adaptive segment point, uand uare slopes on two sides of the adaptive segment point ka; and for subsequently updating parameters (v, v) according to the cost function to update the look-up table based on the updated parameters (v, v) and the fixed segment point, wherein vand vare slopes on two sides of the fixed segment point. Therefore, the adaptive digital predistortion device according to the present invention can obtain a good performance within an acceptable convergence time by combining the adaptive segment with the fixed segment.