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. 18, 2005
Filed:
Jan. 05, 2001
Gerd Heinrich, Buckenhof, DE;
Frank Gerhard Ernst Obernosterer, Weissenohe, DE;
Gerd Heinrich, Buckenhof, DE;
Frank Gerhard Ernst Obernosterer, Weissenohe, DE;
Lucent Technologies Inc., Murray Hill, NJ (US);
Abstract
The invention relates to a method and a device for processing signals of a digital transmission system in general, and for estimating the frequency offset of the transmission system in particular. In one embodiment, the method according to the invention estimates the pulse response of the transmission system and shortens the pulse response by means of a variable prefilter. The duration of the shortened pulse response is, in particular, shorter than the duration of a known symbol sequence which is transmitted twice identically within one method cycle. By comparing samples of the received signal which correspond to the known identical symbols, the frequency offset is estimated reliably, and suitable measures can be taken to compensate it. Consequently, the efficiency of the receiver is substantially improved with respect to the recovery of the transmitted data. The invention can be used, in particular, for transmitting data in blocks, even when there is no freedom from inter-symbol interference, and even when the unshortened pulse response is longer than the known symbol sequence. Transmission using GSM/EDGE systems is one field of application.