Clock Synchronization – An Approach using Mapping Functions

Konferenz: European Wireless 2014 - 20th European Wireless Conference
14.05.2014 - 16.05.2014 in Barcelona, Spain

Tagungsband: European Wireless 2014

Seiten: 7Sprache: EnglischTyp: PDF

Persönliche VDE-Mitglieder erhalten auf diesen Artikel 10% Rabatt

Han, Sangjin (Department of Electrical and Computer Engineering, University of Maryland, College Park, Maryland, USA)
Agrawala, Ashok; Mah, Matthew (Department of Computer Science, University of Maryland, College Park, Maryland, USA)
Exel, Reinhard; Bigler, Thomas (Center for Integrated Sensor Systems, Danube University Krems, 2700 Wiener Neustadt, Austria)

In a distributed system most nodes maintain a local oscillator to derive time information for synchronization with other nodes. A number of clock synchronization techniques have been presented in the literature (e.g. NTP, PTP) which rely on the exchange of messages among nodes to share timing information and to adjust the offset or skew of the clocks. In this paper we present an approach which does not require any adjustments to the local clocks, but relies on achieving synchronization through clock mapping functions which map the time at one node to the time at another node. We further show how closed paths in a graph of nodes can be used to estimate the synchronization tolerance. Through experimental results using piecewise linear functions, we demonstrate the feasibility of this approach and show how clock synchronization of better than 100 ps can be achieved in Wi-Fi environments.