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:
Feb. 19, 2008
Filed:
Aug. 21, 2003
Kinichi Higure, Kodaira, JP;
Kinichi Higure, Kodaira, JP;
Hitachi Kokusai Electric Inc., Tokyo, JP;
Abstract
A method for use in an apparatus for frequency error detection and automatic frequency control detects a frequency error by utilizing known symbols other than a data signal contained in an input signal. At least two known symbols located at positions somewhat distant from each other in the input signal are extracted therefrom. A phase shift between the two known symbols in the input signal represents a frequency shift of the input signal. The frequency shift of the input signal is detected from the phase shift. A first symbol set including at least two known different symbols and a second symbol set including at least two known symbols having a different symbol distance from that of the first symbol set are extracted.