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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.
무선 센서 네트워크 시간 동기화에 대한 왜곡 보정 알고리즘
시우쿠마 ( Shiu Kumar ),투샤케샤브 ( Tushar Keshav ),조동현 ( Dong Hyeon Jo ),김희 ( Hui Kim ),이재영 ( Jae Yeong Lee ),전혜지 ( Hye Ji Jeon ),정민아 ( Min A Jeong ),이성로 ( Seong-ro Lee ) 한국정보처리학회 2013 한국정보처리학회 학술대회논문집 Vol.20 No.1
Wireless sensor networks (WSNs) have emerged as an attractive and key research area over the last decade. Time synchronization is a vital part of infrastructure for any distributed system. In embedded sensor networks, time synchronization is an essential service for correlating data among nodes and communication scheduling. This is realized by exchanging messages that are time stamped using the local clocks on the nodes. Various time synchronization protocols have been proposed aiming to attain high synchronization accuracy, high efficiency and low communication overhead. However, it requires that the time between resynchronization intervals to be as large as possible to obtain a system which is energy efficient having low communication overhead. This paper presents a simple but effective skew compensation algorithm that measures the skew rate of the sensor nodes with respect to the reference node and calibrates itself to compensate for the difference in the frequencies of the nodes. The proposed method can be incorporated with any existing time synchronization protocol for WSNs.