Characterization of Human Body Forward Path Loss and Variability Effects in Voltage-Mode HBC
Characterization of Human Body Forward Path Loss and Variability Effects in Voltage-Mode HBC
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DOI：
10.1109/lmwc.2018.2800529
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发表时间：
2018-03-01
影响因子：
3
通讯作者：
Sen, Shreyas
中科院分区：
文献类型：
--
作者：
Maity, Shovan;Mojabe, Kavian;Sen, Shreyas
人体通信（HBC）最近成为连接超低功耗可穿戴/植入式设备的一种有前途的方式。在先前报道的文献中，HBC通道特征的广泛变化要求对这种变化的来源进行深入分析。同样重要的是要确定大部分的损失是由于通过人体传播（前向路径），还是由于通信设备之间缺乏共同点。我们的实验表明，除了频率依赖性外，激发/终止方式、电极面积和压力等多种其他因素也会显著影响HBC损耗。在这封信中，我们的重点是测量人体损失的共地高达1mhz（即，兆位的数据速率使用宽带信号），并调查上述变化源的影响。我们的实验表明：1)高阻抗终端与电压模式通信使接收信号最大化；2)在电容式HBC中，与非共地引起的返回路径损耗相比，正向路径损耗显著降低（平均0.5 dB，变化0.5 dB）；3)简化的集总HBC模型解释了激励/终止相关损失的变化；4)共地情况下，耦合器面积/压力对前向信道损耗的影响。
Human body communication (HBC) has recently emerged as a promising modality for connecting ultralow power wearable/implantable devices. The wide variations in HBC channel characteristics in previously reported literature call for an in-depth analysis of the sources of such variations. It is also important to identify whether most of the loss is due to propagation through human body (forward path), or the lack of common ground among the communicating devices. Our experiments show that along with frequency dependence, multiple other factors, such as excitation/termination modality, electrode area, and pressure, significantly affect HBC loss. In this letter, we focus on measuring human body loss with common ground up to 1 MHz (i.e., megabits of data rate using broadband signaling), and investigate the effects of abovementioned variation sources. Our experiments show: 1) high-impedance termination along with voltage-mode communication maximizes received signal; 2) in capacitive HBC, the forward path loss is significantly lower (average: 0.5 dB and variation: 0.5 dB) compared to the return path loss due to noncommon ground; 3) variation in excitation/termination dependent losses explained by a simplified lumped HBC model; and 4) the effect of coupler area/pressure on forward-path channel loss in common ground scenario.