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:
Jun. 13, 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 an apparatus relating to a fine frequency synchronization compensating for a carrier frequency deviation from an oscillator frequency in a multi-carrier demodulation system of the type capable of carrying out a differential phase decoding of multi-carrier modulated signals, the signals comprising a plurality of symbols, each symbol being defined by phase differences between simultaneous carriers having different frequencies. A phase difference between phases of the same carrier in different symbols is determined. Thereafter, a frequency offset is determined by eliminating phase shift uncertainties related to the transmitted information from the phase difference making use of a M-PSK decision device. Finally, a feedback correction of the carrier frequency deviation is performed based on the determined frequency offset. Alternatively, an averaged frequency offset can be determined by averaging determined frequency offsets of a plurality of carriers. Then, the feedback correction of the frequency deviation is performed based on the averaged frequency offset.