超宽带信号在运动人体下阴影衰落对通信性能的影响  

Influence of shadow fading of UWB signal under moving human body on communication performance

作　　者：车克龙 廖薇 周灵丽 Che Kelong;Liao Wei;Zhou Lingli(School of Electronic and Electrical Engineering,Shanghai University of Engineering Science,Shanghai 201620,China)

机构地区：[1]上海工程技术大学电子电气工程学院,上海201620

出　　处：《电子测量与仪器学报》2022年第5期155-162,共8页Journal of Electronic Measurement and Instrumentation

基　　金：国家自然科学基金(62001282)项目资助。

摘　　要：超宽带信号在人体通信技术中具有低功耗、抗衰减等优势。针对人体信道建模工作中阴影衰落与运动状态关联性的问题,文章基于人体不同运动姿态与组织电磁特性建立人体模型,分析超宽带信号下的动态人体信道阴影衰落特性。首先,通过建立80条数据传播链路分析人体不同状态下的体表传播特性,给出了一种体表传播距离与路径损耗的二阶指数衰减关系。其次,分析了动态模型组织电特性变化对路径损耗的影响情况。最后,使用平均误码率研究了UWB系统在动态阴影衰落下的性能差异。结果表明,在动态人体模型下UWB频段的抗损耗性能优于HBC频段,其阴影衰落强度受运动状态影响程度强于HBC频段。研究对超宽带信号在人体通信的建模、应用工作中提供了动态人体阴影衰落强度分布的理论基础。Ultra-wideband signals have the advantages of low power consumption and anti-attenuation in human body communication technology.Aiming at the problem of the correlation between shadow fading and motion state in the human body channel modeling work,this article establishes a human body model based on the human body's different motion postures and the electromagnetic characteristics of tissues,and analyzes the dynamic human body channel shadow fading characteristics under ultra-wideband signals First,by establishing 80 data transmission links to analyze the body surface propagation characteristicsof the human body in different states,a second-order exponential attenuation relationship between body surface propagation distance and path loss is given.Secondly,the influenceofchanges in theelectrical characteristicsofthe dynamic model organizationonthe path loss isanalyzed.Finally,the average biterror rate isused to study the performance differenceofUWBsystem under dynamicshadow fading.The resultsshow that the antiloss performance of the UWB frequency band under the dynamic human body model is better than thatofthe HBC frequency band,and theintensity of shadow fading is affectedby themotion state morethan the HBCfrequency band.Theresearch providesatheoretical basis for dynamic human shadow fading intensity distribution in the modeling and application of ultra-wideband signals in human body communication.

关 键 词：人体通信 路径损耗 动态模型 通信性能 

分 类 号：TN911[电子电信—通信与信息系统]