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:
Jul. 01, 2003
Filed:
Dec. 10, 1999
Applicant:
Inventor:
Hitosi Matui, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03D 1/00 ; H04L 2/706 ;
U.S. Cl.
CPC ...
H03D 1/00 ; H04L 2/706 ;
Abstract
A signal estimator is provided that can track a large frequency offset. A received signal distorted in a transmission path is phase-rotated by the phase rotator ( ) and is then estimated by the maximum likelihood sequence estimator (MLSE) ( ). The phase detector ( ) detects a phase difference between a signal obtained by delaying the phase-rotated signal and information about a minimum path metric in the Viterbi algorithm operation by the MLSE. After the phase difference signal is filtered, the voltage-controlled oscillator (VCO) receives the filtered signal. Then, the phase rotation is controlled with the output of the VCO.