Efficient Charging of Access Limited Wireless Underground Sensor Networks
Efficient Charging of Access Limited Wireless Underground Sensor Networks
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DOI：
10.1109/tcomm.2016.2550435
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发表时间：
2016-04
影响因子：
8.3
通讯作者：
S. Kisseleff;Xiaoyang Chen;I. Akyildiz;W. Gerstacker
中科院分区：
文献类型：
--
作者：
S. Kisseleff;Xiaoyang Chen;I. Akyildiz;W. Gerstacker
无线地下传感器网络（WUSNs）提出了各种新的研究挑战。近年来，为了克服井下通信中非常恶劣的传播条件，提出了基于磁感应（MI）的传输。在这种方法中，感应线圈被用作传感器节点中的天线。与传统的基于电磁波的方法相比，该解决方案实现了更大的传输范围。在过去，已经做出了一些努力，以表征在MI-WUSNs中的信号传输。然而，这些调查大多涉及信息传递。在一些应用中可能约束系统设计的开放问题之一是各个传感器节点的供电。针对MI-WUSNs节点可达性差的问题，提出了一种新的MI-WUSNs无线能量传输方法。该方法主要是基于同时从多个传感器节点与优化的信号星座的信号传输。此外，提供了用于功率发送和接收的最优调度，其最大化网络充电过程的能量效率。所提出的方法相比，天真的方法，并显示了显着改善的系统性能的能源效率。
Wireless underground sensor networks (WUSNs) present a variety of new research challenges. Magnetic induction (MI)-based transmission has been proposed to overcome the very harsh propagation conditions in underground communications in recent years. In this approach, induction coils are utilized as antennas in the sensor nodes. This solution achieves larger transmission ranges compared with the traditional electromagnetic wave-based approach. In the past, some efforts have been made to characterize the signal transmission in MI-WUSNs. Those investigations, however, mostly refer to the information transmission. One of the open issues that may constrain the system design in some of the applications is the powering of the individual sensor nodes. Due to the low accessibility of the nodes, a new method of wireless power transfer for MI-WUSNs is proposed in this paper. This method is mainly based on simultaneous signal transmissions from multiple sensor nodes with optimized signal constellations. Furthermore, the optimal scheduling for power transmission and reception is provided, which maximizes the energy efficiency of the network charging procedure. The proposed method is compared with the naive approaches and shows a significant improvement of the system performance in terms of energy efficiency.