A robust time synchronization approach for underwater networks with inconsistent timestamps

To achieve time synchronization in underwater networks, a linear regression is often applied over a set of sending-receiving timestamps, assuming the participating timestamps are consistent. In this paper, we show that collisions, which are not uncommon during signal exchange in underwater environme...

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Bibliographic Details
Published in2012 International Symposium on Communications and Information Technologies (ISCIT) pp. 1086 - 1091
Main Authors Khandoker, T. I., Licai Fang, Defeng Huang, Sreeram, V.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.10.2012
Subjects
Accuracy
Acoustics
Clocks
Linear regression
Propagation delay
Robustness
Synchronization
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Summary:To achieve time synchronization in underwater networks, a linear regression is often applied over a set of sending-receiving timestamps, assuming the participating timestamps are consistent. In this paper, we show that collisions, which are not uncommon during signal exchange in underwater environment, would lead to inconsistent timestamps. These inconsistent timestamps are outliers. However, existing synchronization approaches ignore the presence of outliers. To obtain a reliable synchronization, we propose a robust algorithm that identifies and eliminates the outliers by employing Cook's distance before applying linear regression. We justify the proposed algorithm in a mobile underwater environment through extensive simulations.
ISBN:9781467311564
1467311561
DOI:10.1109/ISCIT.2012.6380854