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This paper presents the wireless channel characteristics and network deployment in the mine. Our experiments on MicaZ in the tunnel proved that wireless network sensors (WSN) working on 2.4GHz have great potential in the mine. A new radio propagation model for the mine is built in NS based on packet reception rate (PRR), path-loss exponent and shadowing(More)
This paper presents localization of wireless sensor network (WSN). Radio characteristic is discussed, and the frequency of nodes is selected that suitable for radio propagation in coal mine. Section 3 introduces a pattern matching localization approach in the coal mine, combined with geographic information system (GIS) it can realize checking on working(More)
Node localization is one of the key technologies of wireless sensor networks (WSN). Due to the indoor environment requires a high positioning accuracy, an improved algorithm based on RSSI is put forward. In terms of RSSI ranging, the error correction coefficient received from self-correcting locator beacon nodes, and then had been applied to distance(More)
The present wireless communication system under coal mines is characterized by single pattern, fixed communication frequency, incapability of adaptive to various tunnel environments. To solve the above problems, cognitive radio (CR) is applied to the system. This paper focuses on the application of energy detection algorithms used in the spectrum sensing of(More)
In the dynamic, heterogeneous and widely distributed grid environment, task scheduling is a complex and challenging problem. Because in DBC algorithm, QoS requests are static, either based on time optimisation, or budget optimisation, resource allocation in grid is irrational. To solve the problem, one QoS model based on benefit function is presented in(More)
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