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. 31, 2006
Filed:
Apr. 14, 1998
Ernst Eberlein, Grossenseebach, DE;
Sabah Badri, Erlangen, DE;
Stefan Lipp, Erlangen, DE;
Stephan Buchholz, Munich, DE;
Albert Heuberger, Erlangen, DE;
Heinz Gerhaeuser, Waischenfeld, DE;
Ernst Eberlein, Grossenseebach, DE;
Sabah Badri, Erlangen, DE;
Stefan Lipp, Erlangen, DE;
Stephan Buchholz, Munich, DE;
Albert Heuberger, Erlangen, DE;
Heinz Gerhaeuser, Waischenfeld, DE;
Abstract
A method and apparatus provide coarse frequency synchronization compensating for a carrier frequency deviation from an oscillator frequency in a demodulation system capable of demodulating a signal having a frame structure with at least one useful symbol and a reference symbol which is an amplitude-modulated sequence. A received and down-converted signal undergoes amplitude-demodulation to generate an envelope that is correlated with a predetermined reference pattern to determine the carrier frequency deviation. Finally, the oscillator frequency is controlled based on the carrier frequency deviation. The reference symbol may comprise two identical sequences. In this case, the envelope obtained by the amplitude-demodulation has two portions which are based on the identical sequences. One of the portions of the envelope is correlated with the other one of the portions in order to determine the carrier frequency deviation. The oscillator frequency is controlled based on the determined carrier frequency deviation.