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This paper proposes the use of Synchronous Ethernet in networks with multiple paths for the synthesis of a precise frequency reference for distributed measurement systems. The paper presents novel approach based on a Kalman filter with outlier identification and removal followed by a linear quadratic regulator (LQR). The algorithm, to be implemented within a network element, is able to synthetize...
Wireless sensor networks have attracted a lot of attention lately due to their wide range of applications from inventory management to battlefield surveillance. In most ca-ses, an accurate time synchronization is essential to provide a common time reference and facilitate coordinated actions. However, a particular challenge arises when it is considered that network nodes are clocked by low-cost, low-stability...
In this paper, downlink primary synchronization for LTE systems is investigated, including time synchronization and sector identification. The proposed scheme exploits the Primary Synchronization Signal which is generated from known Zadoff-Chu sequences. Unlike the conventional schemes, in which time synchronization is first processed then the demodulated OFDM symbols are cross-correlated with the...
The practical applications of wireless sensor networks require robust time synchronization. In this paper we describe the Flooding Time Synchronization Protocol (FTSP) that provides time synchronization service in such networks. We found there are Key nodes and Non-key nodes when using FTSP in the case of temperature interference. This protocol was designed to utilize low communication bandwidth,...
Cooperation is a key concept used in multi-robot systems for performing complex tasks. In swarm robotics, a self-organized cooperation is applied, where robots with limited intelligence cooperate and interact locally to build up the desired global behavior. In this paper, we are studying a mobile object tracking scenario performed by a swarm of robots. The robustness, scalability and flexibility of...
This paper presents a self-organizing robust clock synchronization algorithm based on the Reachback Firefly Algorithm, which is tailored for the use in wireless networks. We adapt a fault-tolerant algorithm from wired networks to cope with nodes deliberately feeding faulty clock readings into the system. The presented algorithm achieves a tight alignment of the firing phases of the non-faulty nodes,...
Time synchronization of Wireless Sensor Network (WSN) nodes is essential in those applications requiring distributed task scheduling or data aggregation and fusion. In this paper, a new synchronization procedure based on a distributed Proportional Integral (PI) consensus controller is described. Compared to other similar solutions, the proposed approach keeps into account the effect of random communication...
A unified framework to jointly solve the problems of localization and synchronization at the same time is presented in this paper. The joint approach is attractive because it can solve both localization and synchronization using the same set of message exchanges, which is extremely important for energy saving in wireless sensor networks. The inaccuracy of anchor locations and timings is taken into...
In sensor networks, time synchronization between sensor nodes is important because it affects not only the efficiency of information gathering but also energy consumption. Since sensor network environments and sizes change at varying rates, different time synchronization techniques are required for different networks. The pulse-coupled oscillator (PCO) model can be used to achieve local interactions...
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