Wang Yongqiang, Núñez Felipe, Doyle Francis J
Institute for Collaborative Biotechnologies, University of California, Santa Barbara, California 93106-5080 USA.
IEEE Trans Signal Process. 2013 Jul 30;61(21). doi: 10.1109/TSP.2013.2275511.
Pulse-coupled synchronization is attracting increased attention in the sensor network community. Yet its properties have not been fully investigated. Using statistical analysis, we prove analytically that by controlling the number of connections at each node, synchronization can be guaranteed for generally pulse-coupled oscillators even in the presence of a refractory period. The approach does not require the initial phases to reside in half an oscillation cycle, which improves existing results. We also find that a refractory period can be strategically included to reduce idle listening at nearly no sacrifice to the synchronization probability. Given that reduced idle listening leads to higher energy efficiency in the synchronization process, the strategically added refractory period makes the synchronization scheme appealing to cheap sensor nodes, where energy is a precious system resource. We also analyzed the pulse-coupled synchronization in the presence of unreliable communication links and obtained similar results. QualNet experimental results are given to confirm the effectiveness of the theoretical predictions.
脉冲耦合同步在传感器网络领域正吸引着越来越多的关注。然而，其特性尚未得到充分研究。通过统计分析，我们通过解析证明，通过控制每个节点的连接数，即使存在不应期，一般的脉冲耦合振荡器也能保证同步。该方法不要求初始相位位于半个振荡周期内，这改进了现有结果。我们还发现，可以策略性地加入不应期，以减少空闲监听，而几乎不牺牲同步概率。鉴于减少空闲监听会提高同步过程中的能量效率，策略性添加的不应期使同步方案对廉价传感器节点具有吸引力，因为在这些节点中能量是宝贵的系统资源。我们还分析了存在不可靠通信链路时的脉冲耦合同步，并得到了类似结果。给出了QualNet实验结果以证实理论预测的有效性。
