基于人体通信的穿戴式医疗设备通信性能分析-《中国医学物理学杂志》

文章信息/Info

Title:: Communication performance of wearable medical equipment based on human body communication

Author(s):: CHE Kelong; LIAO Wei; ZHOU Lingli; LI Qihang; WU Qiuwen; School of Electronic and Electrical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China

Keywords:: Keywords: human body communication signal detection path loss transmission characteristic channel modeling

摘要:: 人体通信（HBC）技术是利用人体组织为媒介进行通信的新方式，医疗设备使用HBC方式比传统无线通讯在能耗与辐射上更具优势。为研究HBC方式下信道特性与通信性能，文章研究信号在多种身高人体模型下的路径衰减特性；对比了两种调制方式下的信道误码率；在冲激响应模型中，通过功率延迟分布分析多径规律，并使用均方根时延扩展验证该模型。通过分析路径损耗衰减特性得出多个模型下的阴影效应均值，人体信道的阴影效应导致了系统性能下降；对比FSK和PSK调制对信道误码率的影响，PSK调制更适合体表信道；通过分析多径特性，多个模型下的平均信道多径数量约16条，且前4径占据大部分能量；电磁分析下的链路特性和建模结果十分接近，验证了模型的正确性。该研究为体域网体表链路中医疗设备接收机的设计提供了理论支持。

Abstract:: Abstract: Human body communication (HBC) is a new way of communication using human tissues as a medium. Medical equipment using HBC is advantageous over traditional wireless communication in energy consumption and radiation. The study aims to study the channel characteristics and communication performance of the HBC mode by analyzing the signal path loss characteristics in human body models of various heights, comparing the bit error rate of channels in two kinds of modulation modes, and analyzing the multipath law in impulse response model through power delay profile. The established channel model is verified by root mean square delay extension. The average value of the shadow effect in multiple models is obtained through analyzing the path loss characteristics. The shadow effect of the human body channel leads to the reduction of system performance. The comparison on the effects of FSK and PSK modulations on the bit error rate reveals that PSK modulation is more suitable for the body surface channels. The analysis on the multipath characteristics showed that the average number of channel multipaths in multiple models is about 16, and the first 4 paths occupy most of the energy. The link characteristics under electromagnetic analysis are very close to the modeling results, verifying the correctness of the model. This study provides theoretical support for the design of medical equipment receivers in the body surface link of the body area network.