Homomorphic Filtering for Improving Time Synchronization in Wireless Networks
| Autor: | Joaquín Olivares, José María Castillo-Secilla, JM Jose Palomares, Fernando León |
|---|---|
| Přispěvatelé: | Universidad de Alicante. Instituto Universitario de Investigación Informática |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
oscillators
Computer science Real-time computing Clock skew 02 engineering and technology Synchronization 01 natural sciences Biochemistry Clock synchronization Article Analytical Chemistry Homomorphic filtering Sampling (signal processing) 0202 electrical engineering electronic engineering information engineering Computer Science::Networking and Internet Architecture Oscillators Electrical and Electronic Engineering Instrumentation Protocol (object-oriented programming) clock skew Wireless network TinyOS 010401 analytical chemistry Temperature temperature 802.15.4 020206 networking & telecommunications WSN Atomic and Molecular Physics and Optics 0104 chemical sciences tuning-fork synchronization homomorphic filtering TelosB Arquitectura y Tecnología de Computadores Wireless sensor network Tuning-fork |
| Zdroj: | Sensors (Basel, Switzerland) Sensors 17(4), 909 (2017) Helvia. Repositorio Institucional de la Universidad de Córdoba instname Sensors; Volume 17; Issue 4; Pages: 909 RUA. Repositorio Institucional de la Universidad de Alicante Universidad de Alicante (UA) |
| ISSN: | 1424-8220 |
| Popis: | Wireless sensor networks are used to sample the environment in a distributed way. Therefore, it is mandatory for all of the measurements to be tightly synchronized in order to guarantee that every sensor is sampling the environment at the exact same instant of time. The synchronization drift gets bigger in environments suffering from temperature variations. Thus, this work is focused on improving time synchronization under deployments with temperature variations. The working hypothesis demonstrated in this work is that the clock skew of two nodes (the ratio of the real frequencies of the oscillators) is composed of a multiplicative combination of two main components: the clock skew due to the variations between the cut of the crystal of each oscillator and the clock skew due to the different temperatures affecting the nodes. By applying a nonlinear filtering, the homomorphic filtering, both components are separated in an effective way. A correction factor based on temperature, which can be applied to any synchronization protocol, is proposed. For testing it, an improvement of the FTSP synchronization protocol has been developed and physically tested under temperature variation scenarios using TelosB motes flashed with the IEEE 802.15.4 implementation supplied by TinyOS. This work has been partly supported by the Computer Architecture, Electronics and Electronic Technology Department at University of Cordoba (Spain), Spanish Grants P11-TIC-7462 and DPI2013-47347-C2-2-R and European Grant EEA 014-ABELCM-2013. |
| Databáze: | OpenAIRE |
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