Frequency offset estimation method for average consistency clock synchronization

Abstract

The invention relates to a frequency offset estimation method for average consistency clock synchronization, and belongs to the technical field of wireless sensor networks. According to the method, solving of maximum likelihood estimation is converted into a linear optimization problem in combination with distributed one-way broadcast characteristics, and a relative frequency offset estimation value is obtained by adopting an iterative method. By applying the estimated value to inter-node logic clock parameter compensation, the effect of keeping logic clocks of network nodes consistent can beachieved. According to the method, the distribution characteristics of the communication time delay are fully considered, accurate relative frequency offset estimation can be realized, so that the synchronization precision of average consistency clock synchronization is effectively improved, the maximum likelihood estimation solution is carried out by adopting an iterative method, the estimation algorithm is simplified, and the storage overhead is reduced.

Description

technical field [0001] The invention belongs to the technical field of wireless sensor network communication, and relates to a frequency offset estimation method in average consistent clock synchronization based on maximum likelihood estimation. Background technique [0002] Clock synchronization is a basic supporting technology of wireless sensor networks. Many applications and services, such as routing, sleep scheduling, and data fusion, work on the basis that the clocks of nodes in the network are kept synchronized. In recent years, a large number of studies have focused on solving the clock synchronization problem in wireless sensor networks, among which the typical ones are RBS, TPSN, FTSP, PBS protocols, etc. These clock synchronization protocols are generally divided into two categories: clock synchronization protocols based on reference nodes and distributed clock synchronization protocols. Compared with reference clock synchronization protocols, distributed synchro...

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Problems solved by technology

[0006] In view of this, the purpose of the present invention is to provide an average consistency-oriented clock synchronization frequency offset estimation method, aiming at the problem that the consistent clock synchronization mechanism cannot effectively converge when the communication time delay exists, around the fixed time delay and truncated exponential random Delay, and considering the distributed characteristics of the wireless sensor network, combined with the consistency method to update the logical clock parameters of the nodes, so that the network can achieve accurate clock synchronization

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