一种基于人体通信的路径损耗模型  

A Path Loss Model Based on Human Body Communication

作　　者：王紫阳 廖薇 孙悦[1] WANG Ziyang;LIAO Wei;SUN Yue(School of Electronic and Electrical Engineering,Shanghai University of Engineering Science,Shanghai 201620)

机构地区：[1]上海工程技术大学电子电子工程学院

出　　处：《无线电通信技术》2019年第5期518-522,共5页Radio Communications Technology

基　　金：“上海高校青年东方学者”岗位计划资助项目(QD2017043)

摘　　要：随着智能可穿戴设备的发展,人体通信(Human Body Communication,HBC)为体域网智能传感器及传感器网络在医疗领域的发展提供了新的思路。针对体域网发展的实际应用,对人体周围的信道特性进行完整的研究十分必要。在采用完整人体模型的基础上,应用时域有限差分法,对HBC频段人体信道特性进行了仿真,得出频率和距离对路径损耗特性的关系。同时针对颈部、背部非直射链路进行了仿真研究。结果表明,人体表面5条主要链路中左胸-右胸链路通信性能最佳。在整个HBC频段,路径损耗特性与频率及距离密切相关,随着频率增加,路径损耗逐渐降低,而路径损耗特性与距离间具有定量的数学关系。在体表的非直视链路,路径损耗和相同表面距离的直射链路路径损耗相同,路径损耗仍与体表距离存在定性的数学关系,同时信号的到达前后也与体表距离密切相关。With the development of intelligent wearable devices,human body communication provides a new idea for the development of intelligent sensors of body area network and sensor networks in the medical field.Therefore,for the practical application of the development of body area network,it is necessary to conduct a complete study of the channel characteristics around the human body.Based on the complete human body model,the channel characteristics of human body in the frequency band of human body communication are simulated by using finite difference time domain method.The relationship between the path loss characteristics and the frequency and distance is obtained.At the same time,the non-direct links of neck and back are simulated.The results show that the left chest-right chest link has the best communication performance among the five main links on the human surface.In the whole human body communication frequency band,path loss characteristics are closely related to frequency and distance.With the increase of frequency,path loss gradually decreases,and there is a quantitative mathematical relationship between path loss characteristics and distance.In the non-direct-looking link of the body surface,the path loss will increase significantly compared with the direct-looking link,but there is still a qualitative mathematical relationship with the body surface distance.At the same time,the arrival of the signal is also closely related to the body surface distance.

关 键 词：人体通信 路径损耗 时域有限差分 人体耦合 表面波 传感器网络 

分 类 号：TN911[电子电信—通信与信息系统]