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:
Jun. 23, 2009
Filed:
Jun. 10, 2005
Takayoshi Ode, Kawasaki, JP;
Yasuyuki Oishi, Kawasaki, JP;
Tokuro Kubo, Kawasaki, JP;
Kazuo Nagatani, Kawasaki, JP;
Hajime Hamada, Kawasaki, JP;
Hiroyoshi Ishikawa, Kawasaki, JP;
Takayoshi Ode, Kawasaki, JP;
Yasuyuki Oishi, Kawasaki, JP;
Tokuro Kubo, Kawasaki, JP;
Kazuo Nagatani, Kawasaki, JP;
Hajime Hamada, Kawasaki, JP;
Hiroyoshi Ishikawa, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A distortion compensating apparatus for correcting the size of a distortion compensation coefficient in such a manner that a transmit signal that has undergone distortion compensation will not exceed the dynamic range of a DA converter. Specifically, before a distortion compensation coefficient h(p) that has been calculated by a calculation unit is stored in a coefficient memory, an assumption is made that distortion compensation will be performed using the distortion compensation coefficient h(p). Then it is determined beforehand whether a signal x(t)*h(p) that will be obtained by this distortion compensation will exceed the limit of a DA converter. If the limit will be exceeded, the size of the distortion compensation coefficient is reduced by a correction unit, the corrected distortion compensation coefficient is stored in the memory and the transmit signal is corrected using the stored distortion compensation coefficient.