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In this paper, we focus on a roadside directional sensor network where sensors with directional Field Of Views (FOVs) are placed along a roadway. We study the problem of wakeup scheduling, with the objective of maximizing network lifetime under the constraint that full coverage and network connectivity are maintained at all times. First, we present centralized polynomial time algorithms to optimally...
This paper investigates the effect of channel estimation error (CEE) on the performance of distributed estimation of an unknown parameter in wireless sensor networks (WSNs). Firstly, considering the maximum likelihood estimator (MLE) of the unknown parameter has a high complexity preventing its practical implementation, a suboptimal ML estimator is derived as a low complexity alternative. Considering...
With the development of wireless sensor networks, energy supplying problem become critical. One solution method is energy scavenging technology which harvest energy existed in environment, such as solar, vibration, air flow, temperature difference, ambient electromagnetic fields and etc. In substations, the method harvesting energy from the electric field to power sensor nodes is adopted because it's...
The barrier coverage model was proposed for applications in which sensors are deployed for intrusion detection. In this paper, we study a strong barrier coverage problem in wireless sensor networks with directional sensors. First, we introduce the directional coverage graph to model barrier coverage with directional sensors. Based on this graph model, we present an integer linear programming formulation...
This paper presents a new progressive distributed estimation scheme (DES) along with the power scheduling among sensors under AWGN channels. The progressive DES consists of a transmission bit allocation scheme and a quasi best linear unbiased estimate (BLUE) of the unknown parameter at each sensor. This scheme is shown to outperform the traditional progressive DES. Moreover, the power scheduling among...
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