US 6,931,084 B1
Differential coding and carrier recovery for multicarrier systemsGeneral
US 6,931,084 B1
Differential coding and carrier recovery for multicarrier systems
Tech Center:
2600 Communications
Examiner:
Stephen Chin
Art Unit:
2634 Digital and Optical Communications
Inventors:
Ernst Eberlein; Sabah Badri; Stefan Lipp; Stephan Buchholz; Albert Heuberger; Heinz Gerhaeuser; Robert Fischer
Assignee:
FRAUNHOFER-GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
Priority:
04/14/98
Filed:
04/14/98
Granted:
08/16/05
Expiration:
11/29/20
Abstract
A method of performing an echo phase offset correction in a multi-carrier demodulation system involves the step of differential phase decoding phase shifts based on a phase difference between simultaneous carriers having different frequencies. An echo phase offset is determined for each decoded phase shift by eliminating phase shift uncertainties related to the transmitted information from the decoded phase shift. The echo phase offsets are averaged in order to generate an averaged offset. Finally, each decoded phase shift is corrected based on the averaged offset.