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Conventional energy detection (ED) spectrum sensing method requires the knowledge of noise power and consequently suffers from noise uncertainty. In this letter we propose a novel blind spatial spectrum sensing method to conquer this problem. We utilize an Electronically Steerable Parasitic Antenna Receptor (ESPAR) which can divide the space into several sectors and switch receive beampattern to each...
This paper introduces a cost-effective and robust positioning architecture that relies on wireless sensor networks (WSNs) for construction resources localization. The architecture determines the location of mobile sensor nodes by evaluating radio signal strengths (RSS) received by stationary sensor nodes. Only a limited quantity of reference points with known locations and pre-calibrated RSS in relation...
The power of nodes in the first layer of a wireless sensor network (WSN) cannot last due to their frequent relay tasks. One possible solution to this disadvantage is to adopt the first order load-balanced algorithm (LBA) to redistribute the loading of the first layer node uniformly. The balanced low-latency convergecast tree (BLLCT) algorithm, a LBA, is generally utilized in route planning in ecological...
This paper proposes a robot deployment algorithm that overcomes unpredicted obstacle, and employs a full-coverage deployment with the minimal number of sensor nodes. Without providing the location information, a spiral movement rule is proposed for robot efficiently deploying sensors to achieve power conservation and full-coverage purposes. Simulation results reveal that the proposed robot deployment...
The energy consumption is a key design criterion for the routing protocols in wireless sensor networks. Some of the conventional single path routing schemes may not be optimal to maximize the network lifetime and connectivity. In this paper, we propose a distributed, scalable and localized multipath search protocol to discover multiple node-disjoint paths between the sink and source nodes. We also...
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