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Predictable wireless networking is a basis for real-time cyber-physical-human (CPH) systems such as those in augmented reality, connected and automated vehicles, and industrial automation, and a fundamental problem in predictable wireless networking is predictable control of intra-network interference in the presence of dynamics and uncertainties. We present the Physical-Ratio-K (PRK) wireless interference...
There are advantages to retrieve information from the Wireless Sensor Network (WSN) for UAVs (Unmanned Aerial Vehicles). However, the UAV-WSN system has some differences with conventional WSN system. So it is important to design an appropriate scheme to control the transmission in a UAV-WSN system. In this paper we proposed a protocol called A-OAloha (Adaptive-Opportunistic Aloha) for UAV-UAV-WSN...
Wireless sensor nodes are essential elements in wireless sensor networks. There are two important issues which need to be considered in order to build a sensor node: low power consumption and scalability. This paper proposes and presents a SoC architecture of wireless sensor node based on open source IP blocks such as OpenRISC 1200 microprocessor core and Wishbone Interconnect Matrix bus core. This...
In this paper, we consider cooperative spectrum sensing in OFDM based on energy detection in MIMO cognitive radio sensor networks. Soft combination of the observed energy values from different cognitive radio users is investigated. Square-law-combining (SLC) is theoretically proved to be nearly optimal in low signal-to-noise ratio (SNR) region, an usual scenario in the context of MIMO cognitive radio...
Generally self-organization of the active sensor networks is moving a collection of robots from an area to desired area. When the robots reach the designated area in a network with a topological structure different from the desired one, reconfiguration of the sensor network must be performed by changing the topological structure. During the reconfiguration process, we need to ensure that each robot...
In wireless sensor network, the sensors collect data about natural phenomenon and transmit them to a server in real-time. Many researches mainly focus on processing continuous queries as approximate forms. However, these approaches are difficult to apply to such environmental applications which require storing the correct data. In this paper, we introduce two insertion methods, called TSI (time-segment...
A wireless sensor network consists of many sensors that collect and transmit physical or environmental conditions at different locations to a server continuously. Many researches mainly focus on processing continuous queries on real-time data stream. However, they do not concern the problem of storing the historical data, which is mandatory to the historical queries. In this paper, we propose a system...
Wireless sensor networks (WSNs) can be used to collect surrounding data by multi-hop. As sensor networks have the limited and not rechargeable energy resource, energy efficiency is an important design issue for its topology. In this paper, we derive the exact mathematical expression for the flat and clustering schemes, respectively. Then the energy consumption of different schemes are compared. Motivated...
Energy consumption and reliability are two critical issues in wireless sensor networks (WSNs). What is the length of lifetime of a WSN in an unreliable environment is our focus. In this paper, the clustering scheme is introduced firstly. A data aggregation tree model is formed in the periodic data collection application. Based on this model, the energy consumption and reliability issues are analyzed,...
Wireless sensor networks can be used to collect surrounding data by multi-hop. As sensor networks have the limited and not rechargeable energy resource, energy efficiency is an important design issue for its topology. In this paper, we propose a distributed algorithm, EEMC (energy-efficient multi-tier clustering), that generates multi-tier clusters for long-lived sensor networks. EEMC terminates in...
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