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:
Jan. 06, 2004
Filed:
Mar. 06, 2001
Kazuo Tanada, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A frequency error estimating apparatus for estimating a frequency error between a local oscillation frequency and a carrier frequency of a received signal in a receiver includes a frequency error estimating unit ( ) that suppresses a noise component included in the received signal according to a filter coefficient input to an averaging filter ( ), and estimates a frequency error based on an output of the filter; and a filter coefficient determining unit ( ) that calculates a filter coefficient based on a differential of estimate values of the frequency error from a first symbol, and changes the characteristics of the filter. In the receiver, the frequency error estimating apparatus can secure high precision in estimating a frequency error without losing the level of following the time variation in the Doppler frequency.