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. 27, 2016
Filed:
Oct. 02, 2013
Khalifa University of Science, Technology, and Research, Abu Dhabi, AE;
British Telecommunications Plc, London, GB;
Emirates Telecommunications Corporation, Abu Dhabi, AE;
James Aweya, Abu Dhabi, AE;
Khalifa University of Science, Technology and Research, Abu Dhabi, AE;
Emirates Telecommunications Corporation, Abu Dhabi, AE;
British Telecommunications Corporation, London, GB;
Abstract
This invention relates to methods and devices for time and frequency synchronization, especially over packet networks using, for example, the IEEE 1588 Precision Time Protocol (PTP). Timing protocol messages are exposed to artifacts in the network such as packet delay variations (PDV) or packet losses. Embodiments of the invention provide a digital phase locked loop (DPLL) based on direct digital synthesis to provide both time and frequency signals for use at the slave (time client). An example of this DPLL in conjunction with a recursive least squares mechanism for clock offset and skew estimation is also provided.