Evaluation of Ground Loop Through the Floor in Human Body Communication
Evaluation of Ground Loop Through the Floor in Human Body Communication
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DOI：
10.1007/s10776-017-0338-3
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发表时间：
2017-02
影响因子：
2.5
通讯作者：
K. Sasaki;N. Arai;D. Muramatsu;F. Koshiji
中科院分区：
文献类型：
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作者：
K. Sasaki;N. Arai;D. Muramatsu;F. Koshiji
人体通信（HBC）是一种利用人体作为传输介质的一部分的无线传输方法。信号通过人体中的微弱电流以及发射器、接收器、人体和地板之间的电容耦合来传输。 HBC 的传输模型中通常包含与地板的电容耦合；然而，它的贡献还没有被充分理解。本文评估了 HBC 中穿过地板的接地环路的贡献。测量了两种情况下的接收信号强度：两名受试者握手，以及一名受试者触摸放置在支架上的离体接收器。受试者每个人的手腕上都戴着发射器或接收器。他们站在铺着地毯的金属地板、混凝土地板、硬木地板上，木椅位于地板上方。根据受试者使用哪只手握手或触摸离体接收器，信号衰减的变化约为 40 dB，而不同地板类型引起的变化小于 5 dB。通过数值模拟获得的衰减显示了类似的结果。这些结果表明，穿过地板的接地环路的贡献很小。
Human body communication (HBC) is a wireless transmission method that utilizes the human body as part of the transmission medium. A signal is transmitted by weak electric current through the human body and by capacitive coupling between transmitter, receiver, human body, and floor. Capacitive coupling with the floor is often included in the transmission models of HBC; however, its contribution is not well understood. This paper evaluated the contribution of the ground loop through the floor in HBC. The received signal strength was measured for two cases: two subjects shaking hands, and a subject touching an off-body receiver placed on a stand. The subjects each wore a transmitter or a receiver on their wrist. They stood on a carpet-covered metal floor, concrete floor, hardwood floor, and wooden chair to be above the floor. The variation of the signal attenuation was approximately 40 dB depending on which hand the subject used to shake hands or to touch the off-body receiver, while the variation caused by the different floor types was less than 5 dB. The attenuation obtained by numerical simulation showed similar results. These results show that the contribution of a ground loop through the floor was small.