论文标题
新颖的最大似然估计时钟偏斜以单向广播时间同步
Novel Maximum Likelihood Estimation of Clock Skew in One-Way Broadcast Time Synchronization
论文作者
论文摘要
时钟偏斜补偿对于无线网络中准确的时间同步至关重要。但是，当代时钟偏度估计基于不准确的传输时间测量，这使得可靠的估计具有挑战性。基于单向广播同步，本研究提出了一种新颖的最大似然估计（MLE），并具有创新的实现，以最大程度地减少由延迟引起的时钟偏斜估计误差。开发了一个多个单向广播模型，用于观察和集合，同时讨论了实际延迟的分布。然后提出了基于高斯延迟的时钟偏度MLE，并提供了其Cramer-Rao下限。开发的MLE独立于时钟偏移估计，仅需要两个同步周期才能产生准确的估计。广泛的实验结果表明，所提出的MLE的性能比在现有时间同步方案中杂种的方法更好。
Clock skew compensation is essential for accurate time synchronization in wireless networks. However, contemporary clock skew estimation is based on inaccurate transmission time measurement, which makes credible estimation challenging. Based on one-way broadcast synchronization, this study presents a novel maximum likelihood estimation (MLE) with an innovative implementation to minimize the clock skew estimation error caused by delay. A multiple one-way broadcast model is developed for observation and set collection, while the distribution of actual delay is discussed. A clock skew MLE based on Gaussian delay is then proposed and its Cramer-Rao lower bound provided. The developed MLE is independent of the clock offset estimation, and requires only two synchronization periods to generate an accurate estimation. Extensive experimental results indicate that the performance of the proposed MLE is better than the methods popularly used in existing time synchronization protocols.
