An Effective Frequency Drift and Phase Offset Estimation Based on Two-Way Message Exchange for WSNs Time Synchronization

Time synchronization is one of the key technologies of wireless sensor networks. At present, most studies assume that the transmission delay is a fixed value, and there is no effective processing of historical clock data. Therefore, this paper proposes a clock frequency drift and phase offset estima...

Full description

Saved in:
Bibliographic Details
Published in:Mobile information systems 2022-09, Vol.2022, p.1-7
Main Authors: Wang, Yijun, Wang, Jie, Luo, Qi, Liu, Dakun
Format: Article
Language:English
Subjects:
Accuracy
Cramer-Rao bounds
Crystal oscillators
Delay
Energy consumption
Frequency drift
Linear programming
Lower bounds
Maximum likelihood estimation
Random variables
Sensors
Simulation
Standard data
Time synchronization
Wireless sensor networks
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Time synchronization is one of the key technologies of wireless sensor networks. At present, most studies assume that the transmission delay is a fixed value, and there is no effective processing of historical clock data. Therefore, this paper proposes a clock frequency drift and phase offset estimation scheme which is considering variable transmission delay and historical clock data. This paper has clarified the effectiveness of the Gaussian delay model in the calculation of time synchronization error. On this basis, this paper calculated the maximum likelihood estimations of frequency drift and phase offset and the corresponding Cramer-Rao lower bound. Meanwhile, the transmission delay is optimized by comparing the chi-square distance between measured and standard data. Also, this paper conducts autonomous training on historical data to provide services for improving the accuracy of fitting estimation. Simulation results validate the performance of the proposed scheme.
ISSN:1574-017X
1875-905X
DOI:10.1155/2022/3004218