Jinpeng Tian

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To meet the need of safe production in coal mine, a monitoring system based on wireless sensor networks is designed. Consideration of the topographic features of coal mine, two-level network is adopted. The upper level network uses 433MHz as communication frequency which has the characteristics of long transport distance and strong penetration, while the(More)
By studying the shortage of the traditional fixed step size least mean square (LMS) algorithm. This paper builds a nonlinear function relationship between μ and the error signal by reviewing the existing algorithm and presents a novel variable step size LMS adaptive filtering algorithm by improving Sigmoid function based on translation(More)
A routing scheme of wireless sensor networks which is suitable for mine monitoring system is designed in this paper. Consideration of the topographic features of coal mine, two-level network is adopted. We design a semi-proactive routing protocol based on tree topology. Isolated nodes in the network send routing requests to neighbor nodes with least path(More)
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