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:
Aug. 31, 1999
Filed:
Mar. 31, 1997
Applicant:
Inventors:
Assignee:
Advantest Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03D / ;
U.S. Cl.
CPC ...
375331 ; 375332 ; 375340 ; 329304 ;
Abstract
An input quadrature modulation signal which is converted into a digital signal is converted into a complex baseband signal in a converter 7. A rough estimation of parameters of the signal is made in a rough signal correction unit 51. Using the estimates, the complex baseband signal is corrected. Utilizing a data detection of the corrected signal, a reference signal which corresponds to a transmitted signal is formed from the detected data in a generator 52. The reference signal and the corrected signal are used to estimate parameters in a fine parameter estimation unit 23.