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:
May. 28, 2013
Filed:
Jan. 21, 2011
Nobukazu Fudaba, Kawasaki, JP;
Hiroyoshi Ishikawa, Kawasaki, JP;
Hajime Hamada, Kawasaki, JP;
Yuichi Utsunomiya, Kawasaki, JP;
Kazuo Nagatani, Kawasaki, JP;
Nobukazu Fudaba, Kawasaki, JP;
Hiroyoshi Ishikawa, Kawasaki, JP;
Hajime Hamada, Kawasaki, JP;
Yuichi Utsunomiya, Kawasaki, JP;
Kazuo Nagatani, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
An apparatus includes: a unit that stores the look-up table including distortion compensation coefficients; a unit that selects addresses according to an input signal, acquires coefficients stored at the selected addresses, and performs the predistortion of the input signal by using the acquired coefficients; a unit that calculates an error signal by comparing with the input signal a feedback signal that indicates an output of a power amplifier to which a result of the predistortion is inputted; a unit that calculates coefficients from the error signal and the acquired coefficients by using the adaptive algorithm; a unit that, for each of the selected addresses, selects coefficients as adequate coefficients from among the calculated coefficients according to the error signal; and a unit that, for each of the selected addresses, calculates an average value of the adequate coefficients and replaces a stored coefficient in the look-up table with the average value.