Frequency Offset Estimation for Average Consensus Clock Synchronization
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Solution Overview
Problem
Existing consensus-based clock synchronization mechanisms in wireless sensor networks fail to accurately estimate relative frequency offsets due to the neglect of fixed and random time delays, leading to inaccurate synchronization and performance limitations.
Innovation Solution
A frequency offset estimation method for average consensus-based clock synchronization that considers both fixed and truncated exponential random time delays, using maximum likelihood estimation and a distributed approach to update logic clock parameters, thereby achieving accurate clock synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing consensus-based clock synchronization mechanisms are used, then distributed synchronization is achieved, but accurate frequency offset estimation cannot be obtained due to neglect of fixed and random time delays
Solution Approach 1:
The patent changes the parameter model from ignoring time delay to explicitly modeling both fixed time delay (dijf) and random time delay (dijr(tli)) components. This parameter change enables accurate frequency offset estimation by incorporating the actual time delay characteristics into the estimation formula, resolving the contradiction between distributed synchronization and accurate frequency offset estimation.
Solution Approach 2:
The patent introduces time delay compensation as an intermediary mechanism between clock synchronization and frequency offset estimation. By modeling time delay as a mediator variable with both fixed and random components, the system can accurately estimate frequency offsets while maintaining distributed synchronization characteristics.
2Reliability
If bounded communication time delay is considered in synchronization methods, then synchronization performance improves, but no optimization is performed for distribution characteristics of time delay
Solution Approach 1:
The patent segments the time delay into two distinct components: fixed time delay (dijf) and random time delay (dijr(tli)). This segmentation allows each component to be modeled and optimized separately, improving synchronization performance while managing complexity through structured decomposition of the time delay characteristic.
Solution Approach 2:
The patent changes the time delay parameter from a single bounded value to a distributed model with specific probability density function characteristics. By optimizing for the distribution characteristics (exponential distribution for random component), the system achieves better synchronization performance without excessive complexity.
3Adaptability or versatility
If truncated exponential random time delay is used to model communication delay, then practical significance is improved, but existing methods do not optimize for this specific distribution
Solution Approach 1:
The patent changes the time delay distribution assumption to truncated exponential distribution, which better models practical communication delay characteristics. This parameter change enables accurate frequency offset estimation by using the specific probability density function of truncated exponential distribution in the estimation formula, thereby improving both adaptability and measurement precision.
Data Source
AI summary
The present invention relates to a frequency offset estimation method for average consensus-based clock synchronization, and belongs to the technical field of wireless sensor networks. According to the method, in combination with distributed one-way broadcast characteristics, solving of maximum likelihood estimation is converted into a linear optimization problem, and a relative frequency offset estimation value is obtained by adopting an iterative method. By applying the estimation value to the compensation of logic clock parameter between nodes, an effect of keeping logic clocks of network nodes consistent can be achieved. According to the present invention, distribution characteristics of communication time delay are fully considered, accurate relative frequency offset estimation can be implemented, so the synchronization precision of average consensus-based clock synchronization is effectively improved, the maximum likelihood estimation solving is performed by adopting the iterative method, an estimation algorithm is simplified, and storage overhead is reduced.