TITLE:
On Energy-Efficient Time Synchronization for Wireless Sensors under Large-Scale and Small-Scale Fading Effects
AUTHORS:
Pablo Briff, Ariel Lutenberg, Leonardo Rey Vega, Fabian Vargas
KEYWORDS:
Wireless Sensor Networks; Clock Offset Estimation; Time Synchronization; Wireless Channel Fading
JOURNAL NAME:
Wireless Sensor Network,
Vol.5 No.10,
October
15,
2013
ABSTRACT:
In this work, the existing trade-off between time synchronization
quality and energy is studied for both large-scale and small-scale fading
wireless channels. We analyze the clock offset estimation problem using
one-way, two-way and N-way message exchange mechanisms affected by Gaussian and
exponentially distributed impairments. Our main contribution is a
general relationship between the total energy required for synchronizing a
wireless sensor network and the clock offset estimation error by means of the
transmit power, number of transmitted messages and average message delay,
deriving the energy optimal lower bound as a function of the time
synchronization quality and the number of hops in a multi-hop network.