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Article: Distributed Clock Skew and Offset Estimation in Wireless Sensor Networks: Asynchronous Algorithm and Convergence Analysis
Title | Distributed Clock Skew and Offset Estimation in Wireless Sensor Networks: Asynchronous Algorithm and Convergence Analysis |
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Authors | |
Keywords | Asynchronous algorithm Clock synchronization Factor graph Wireless sensor network |
Issue Date | 2013 |
Publisher | IEEE. The Journal's web site is located at http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=7693 |
Citation | IEEE Transactions on Wireless Communications, 2013, v. 12 n. 11, p. 5908-5917 How to Cite? |
Abstract | In this paper, we propose a fully distributed algorithm for joint clock skew and offs et estimation in wireless sensor networks based on belief propagation. In the proposed algorithm, each node can estimate its clock skew and offset in a completely distributed and asynchronous way: some nodes may update their estimates more frequently than others using outdated message from neighboring nodes. In addition, the proposed algorithm is robust to random packet loss. Such algorithm does not require any centralized information processing or coordination, and is scalable with network size. The proposed algorithm represents a unified framework that encompasses both classes of synchronous and asynchronous algorithms for network-wide clock synchronization. It is shown analytically that the proposed asynchronous algorithm converges to the optimal estimates with estimation mean-square-error at each node approaching the centralized Cram ́er-Rao bound under any network topology. Simulation results further show that the convergence speed is faster than that corresponding to a synchronous algorithm. |
Persistent Identifier | http://hdl.handle.net/10722/199095 |
ISSN | 2023 Impact Factor: 8.9 2023 SCImago Journal Rankings: 5.371 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Du, J | en_US |
dc.contributor.author | Wu, YC | en_US |
dc.date.accessioned | 2014-07-22T01:02:49Z | - |
dc.date.available | 2014-07-22T01:02:49Z | - |
dc.date.issued | 2013 | en_US |
dc.identifier.citation | IEEE Transactions on Wireless Communications, 2013, v. 12 n. 11, p. 5908-5917 | en_US |
dc.identifier.issn | 1536-1276 | - |
dc.identifier.uri | http://hdl.handle.net/10722/199095 | - |
dc.description.abstract | In this paper, we propose a fully distributed algorithm for joint clock skew and offs et estimation in wireless sensor networks based on belief propagation. In the proposed algorithm, each node can estimate its clock skew and offset in a completely distributed and asynchronous way: some nodes may update their estimates more frequently than others using outdated message from neighboring nodes. In addition, the proposed algorithm is robust to random packet loss. Such algorithm does not require any centralized information processing or coordination, and is scalable with network size. The proposed algorithm represents a unified framework that encompasses both classes of synchronous and asynchronous algorithms for network-wide clock synchronization. It is shown analytically that the proposed asynchronous algorithm converges to the optimal estimates with estimation mean-square-error at each node approaching the centralized Cram ́er-Rao bound under any network topology. Simulation results further show that the convergence speed is faster than that corresponding to a synchronous algorithm. | en_US |
dc.language | eng | en_US |
dc.publisher | IEEE. The Journal's web site is located at http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=7693 | - |
dc.relation.ispartof | IEEE Transactions on Wireless Communications | en_US |
dc.subject | Asynchronous algorithm | - |
dc.subject | Clock synchronization | - |
dc.subject | Factor graph | - |
dc.subject | Wireless sensor network | - |
dc.title | Distributed Clock Skew and Offset Estimation in Wireless Sensor Networks: Asynchronous Algorithm and Convergence Analysis | en_US |
dc.type | Article | en_US |
dc.identifier.email | Du, J: dujian@eee.hku.hk | en_US |
dc.identifier.email | Wu, YC: ycwu@eee.hku.hk | - |
dc.identifier.authority | Wu, YC=rp00195 | en_US |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1109/TWC.2013.100213.130553 | - |
dc.identifier.scopus | eid_2-s2.0-84895058803 | - |
dc.identifier.hkuros | 231476 | en_US |
dc.identifier.volume | 12 | en_US |
dc.identifier.issue | 11 | - |
dc.identifier.spage | 5908 | en_US |
dc.identifier.epage | 5917 | en_US |
dc.identifier.isi | WOS:000328058400047 | - |
dc.publisher.place | United States | - |
dc.identifier.issnl | 1536-1276 | - |