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. 11, 2017
Filed:
Dec. 11, 2013
Applicant:
Nec Corporation, Minato-ku, Tokyo, JP;
Inventors:
Kohei Hosokawa, Tokyo, JP;
Yuichi Nakamura, Tokyo, JP;
Assignee:
NEC CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04B 10/00 (2013.01); H04B 10/61 (2013.01); H04J 14/00 (2006.01);
U.S. Cl.
CPC ...
H04B 10/6164 (2013.01);
Abstract
A frequency offset compensation apparatus includes: first FFT means for performing a discrete-time Fourier transform of an input signal; second FFT means for performing a discrete-time Fourier transform; and offset compensation means for changing an order of output data of the first FFT means according to a frequency offset compensation amount, and rearranging the output data, and then inputting the output data to the second FFT means. This makes possible a frequency offset compensation without needing a new complex multiplier or a new memory in optical communication.