Estimation Theory-Based Robust Phase Offset Determination in Presence of Possible Path Asymmetries

Estimation Theory-Based Robust Phase Offset Determination in Presence of Possible Path Asymmetries
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存在可能路径不对称时基于估计理论的鲁棒相位偏移确定

DOI:
10.1109/tcomm.2017.2761879
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发表时间:
2018
影响因子:
8.3
通讯作者:
Blum, Rick S.
Blum, Rick S.
中科院分区:
计算机科学2区
文献类型:
--
作者:
Karthik, Anantha K.;Blum, Rick S.

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本文解决了在存在未知的不对称网络路径延迟的情况下 IEEE 1588 精确时间协议的鲁棒时钟相位偏移估计问题。路径延迟之间未知的不对称性的存在可能导致相位偏移估计方案的性能显着下降。假设多个主从通信路径可用,我们首先提供在存在不对称主从通信路径的情况下相位偏移估计方案的最佳可实现性能的下限。然后,我们提出了一种新颖的相位偏移估计方案,该方案采用期望最大化算法来识别不对称的主从通信路径。丢弃来自这些路径的信息后,我们采用极小极大最优矢量位置参数估计器来估计相位偏移。仿真结果表明,所提出的相位偏移估计方案在各种网络场景中表现出接近下限的性能。
This paper addresses the problem of robust clock phase offset estimation for the IEEE 1588 precision time protocol in the presence of unknown asymmetric network path delays. The presence of an unknown asymmetry between the path delays can lead to significant degradation in the performance of a phase offset estimation scheme. Assuming multiple master-slave communication paths are available, we first provide lower bounds on the best achievable performance for a phase offset estimation scheme in the presence of asymmetric master-slave communication paths. We then present a novel phase offset estimation scheme that employs the expectation-maximization algorithm to identify the asymmetric master-slave communication paths. After discarding information from these paths, we employ the minimax optimum vector location parameter estimator for estimating the phase offset. Simulation results are presented to show that the proposed phase offset estimation scheme exhibits performance close to the lower bounds in a wide variety of network scenarios.
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