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Voltage Compensated Clock Synchronization in Wireless Sensor Networks
Shiu Kumar,Hwanjong Jeong,Jongsang Baek,Seong Ro Lee 한국정보통신학회 2014 2016 INTERNATIONAL CONFERENCE Vol.6 No.1
Clock synchronization of nodes in WSNs is a challenging and ongoing problem. Recently over the years several synchronization protocols for WSNs have been proposed, which focuses on addressing issues such as synchronization accuracy, energy efficiency, wireless channel bandwidth and changes in the clock frequency due to environmental changes such as temperature. One of the major factors of sensor node’s clock drift is the nodes supply voltage. In this paper, a new voltage compensated algorithm (VCA) for clock synchronization in WSNs is presented, which uses a voltage divider circuit to remove the effects of changes in the supply voltage resulting in an increase in time between resynchronization intervals. Using a 16MHz unit with a resonator, VCA achieves an effective clock drift of less than 13ppm over a supply voltage range of 5-12V.