Clock estimation for long-term synchronization in wireless sensor networks with exponential delays

Qasim M. Chaudhari, Erchin Serpedin

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Although the existing time synchronization protocols in wireless sensor networks (WSNs) areefficient for short periods, many applications require long-term synchronization among the nodes, forexample, coordinated sleep and wakeup modes, and synchronized sampling. In such applications, experimentshave shown that even clock skew correction cannot maintain long-term clock synchronization anda quadratic model of clock variations can better capture the dynamics of the actual clock model involved,hence increasing the resynchronization period and conserving significant energy. This paper derives themaximum likelihood (ML) estimator for all the clock parameters in a two-way timing exchange modelwith exponential delays. The same estimation procedure can be applied to one-way timing exchangemodels with little modification.

Original languageEnglish
Article number219458
JournalEurasip Journal on Advances in Signal Processing
Volume2008
DOIs
Publication statusPublished - 2008
Externally publishedYes

Fingerprint

Clocks
Wireless sensor networks
Synchronization
Sampling
Network protocols

ASJC Scopus subject areas

  • Signal Processing
  • Hardware and Architecture
  • Electrical and Electronic Engineering

Cite this

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