Maximum likelihood estimation of clock skew in IEEE 1588 with fractional Gaussian noise
type: Item
instance of: scholarly article
title: Maximum likelihood estimation of clock skew in IEEE 1588 with fractional Gaussian noise
zbMATH Open document ID: 1395.94132
DOI: 10.1155/2015/174289
author: Chagai Levy
author: Monika Pinchas
published in: Mathematical Problems in Engineering
publication date: 2018-08-27T00:00:00Z
review text: Summary: To support system-wide synchronization accuracy and precision in the sub-microsecond range without using GPS technique, the precise time protocol (PTP) standard IEEE-1588 v2 is chosen. Recently, a new clock skew estimation technique was proposed for the slave based on a dual slave clock method that assumes that the packet delay variation (PDV) in the Ethernet network is a constant delay. However, papers dealing with the Ethernet network have shown that this PDV is a long range dependency (LRD) process which may be modeled as a fractional Gaussian noise (fGn) with Hurst exponent (\(H\)) in the range of \(0.5 < H < 1\). In this paper, we propose a new clock skew estimator based on the maximum likelihood (ML) technique and derive an approximated expression for the Cramer-Rao lower bound (CRLB) both valid for the case where the PDV is modeled as fGn (\(0.5 < H < 1\)). Simulation results indicate that our new clock skew method outperforms the dual slave clock approach and that the simulated mean square error (MSE) obtained by our new proposed clock skew estimator approaches asymptotically the developed CRLB.
Mathematics Subject Classification ID: 94A12
zbMATH DE Number: 6925656
Wikidata QID: Q59117473
MaRDI profile type: Publication
full work available at URL: https://doi.org/10.1155/2015/174289
OpenAlex ID: W2018140833
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description: scientific article; zbMATH DE number 6925656