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Research on Time Synchronization Algorithm in Wireless Sensor Networks

Author: NiZeYu
Tutor: YaoFangWu
School: Nanjing University of Posts and Telecommunications
Course: Computer technology
Keywords: Wireless sensor networks The average time synchronization Diffusion synchronization Maximum likelihood estimation
CLC: TN929.5
Type: Master's thesis
Year: 2012
Downloads: 47
Quote: 0
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Abstract


Wireless sensor network (WSN) that contains a large number of wireless sensor nodes , computing, communications and sensing ability . The precise time synchronization is a key component of many WSN applications . In the past most of the time synchronization algorithm , the ordinary nodes usually synchronous clock reference node ( or root node ) . This is very likely to be accidents interference ( for example : a loop failure or node destroyed ) . ATSP algorithm improvements herein, all nodes in a synchronous clock to their average algorithm - IATS algorithm . In this article, there are three main innovations are listed below: IATS algorithm used the ROS ( only receiving sync ) method to reduce the amount of packets sent , while also reducing the energy consumption of the whole network time synchronization . Second , IATS algorithm uses a the diffusion method reached the maximum number of nodes ROS synchronization and local synchronization extended to the whole network - wide time synchronization . Third , IATS algorithm allows adjacent nodes by estimating the relative clock offset and drift with each other relative synchronization . The delay of the Gaussian distribution , the maximum likelihood estimation (MLE) can simultaneously estimate the clock offset and drift . This combination clock offset and drift correction mechanism greatly shorten the cycle time synchronization , an important factor in this whole network synchronization to reduce energy consumption . Innovative ideas and methods in this article , has been studied and confirmed by the analysis and simulation of the system , showing the feasibility of the algorithm .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Mobile Communications
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