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:
Dec. 23, 2025
Filed:
May. 19, 2022
Sennheiser Electronic SE & Co. KG, Wedemark, DE;
Jan Watermann, Hannover, DE;
Sebastian Georgi, Langenhagen, DE;
Sennheiser electronic SE & Co. KG, Wedemark, DE;
Abstract
For radio transmission via OFDM (Orthogonal Frequency Division Multiplex) and TDMA (Time Division Multiple Access), it is important to have at the receiver the exact carrier frequency, and further to perform time synchronization. For time synchronization and simultaneous detection of a carrier frequency offset, a complex-valued synchronization sequence such as e.g. a Zadoff-Chu-sequence is transmitted twice: first in its original version and then, after a predefined time span, in its complex conjugate version. At the receiver, the two corresponding correlation maxima are detected by cross-correlation, and the time span between the maxima is measured. The measured time span is compared to the predefined time span and a time offset is determined. The time offset can be used to improve the synchronization accuracy and to determine the carrier frequency offset.