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:
Sep. 26, 2000
Filed:
Sep. 16, 1997
Applicant:
Inventors:
Assignee:
Nokia Technology GmbH, Pforzheim, DE;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04J / ; H04J / ;
U.S. Cl.
CPC ...
370503 ; 370208 ; 375324 ; 375364 ;
Abstract
An OFDM receiver determines (12; 27) the pulse response of a radio channel and locates (13; 14) its starting point, end point and the maximum and its value. The difference between the end point and the starting point gives the length of the pulse response. A guard interval time corresponding to the guard interval separating the OFDM symbols is set (17; 18) in the receiver in such a manner that it covers the most significant components of the pulse response. A slow and monotonous temporal shift of the pulse response between measurement rounds indicates an error in the sampling frequency. The error is corrected (23; 31) in such a manner that the pulse response shift is compensated for.