非均匀介质人体通信信道建模与衰落特性研究
发布时间：2018-10-24 18:44
【摘要】：随着全球老龄化的发展,与生物医疗相关的可穿戴设备越来越受到人们的密切关注。人体区域通信作为一项新型的通信技术,是把人体本身作为信号传输的媒介,将植在人体体表或体内各种生物传感设备连接起来,组成一个能够处理人体健康信息的体域网。人体通信信道建模是探索人体区域通信技术的前提,一个完善的人体信道模型对于研究信道传播特性是非常有必要的。本论文的主要研究内容是基于国家自然科学基金"基于非均匀介质模型的人体通信动态信道传播特性研究"(No.61403366),深圳市基础研究"用于穿戴式设备的人体通信动态信道传播机制的理论研究与建模分析"(No.JCYJ20140417113430695)相关课题,重点研究了多层非均匀介质人体信道建模及其衰落特性。全文内容安排如下:(1)基于时域有限差分的原理,建立包括皮肤、脂肪、肌肉、骨骼等多层非均匀介质人体计算模型,考虑人体组织复介电常数与频率的相关性,拟合了生物介质Debye模型。通过在人体体表、体内植入信号电极,研究1～100MHz频率范围体表—体表、体表—体内、体内—体表、体内—体内四种植入信道幅度传播特性,并设计了基于猪肉的信道衰减测量方案。最后,使用Balun隔离变换器探究了人体通信信道地电极的"共地"影响。(2)在头部植入发射信号电极,研究了脑机接口链路45MHz通信频率时人体体内、体表、周围附近相对电场强度分布,并分析激励源正弦波不同相位时刻体表电场变化。在此基础上研究正弦波3MHz、45MHz、403.5MHz和2400MHz不同频率对人体电场分布影响。此外,还研究了头部—心脏、头部—手臂、头部—腿部脑机接口链路信道的幅度衰减和群延迟特性。(3)建立圆柱形人体手臂非均匀介质模型,包括前臂、关节及上臂部分,研究手臂弯曲0/180deg~150deg动态信道衰落,并设计基于人体的信道衰减测量方案,分析手臂弯曲角度,以及金属盒对信道传播信号遮挡影响。此外,在人体动态链路研究方面,本文建立了 32帧人体走路姿态模型,研究特定频率下,人体腹部—头部、腹部—手腕和腹部—脚踝的典型链路信道动态衰落特性。(4)研究实际人体通信系统性能相关的链路预算、通信距离、传输速率以及所需发射功率等问题。此外,介绍了实习单位参与研发的"人体通信图像传输系统"项目整体架构设计,并在此基础上完成对样机图像传输速率、信息误码率指标测试,人体通信系统实际图像传输效果比较理想。论文最后对全文取得的研究成果进行总结,并就以后需要深入研究的方向进行展望。
[Abstract]:With the development of global aging, biomedical related wearable devices are attracting more and more attention. As a new communication technology, the human body region communication is to take the human body itself as the medium of signal transmission, to connect the various biosensor devices planted on the human body surface or body, to form a body area network which can deal with the human health information. Human communication channel modeling is the premise of exploring human region communication technology. A perfect human body channel model is very necessary to study the channel propagation characteristics. The main research content of this thesis is based on the National Natural Science Foundation of China "Research on Human Communication dynamic Channel Propagation characteristics based on Non-uniform medium Model" (No.61403366), Shenzhen basic Research "Human Communication dynamic Communication for wearable equipment" Theoretical Research and Modeling Analysis of the Channel Communication Mechanism "(No.JCYJ20140417113430695) related issues," The modeling and fading characteristics of human body channel in multi-layer non-uniform medium are studied in detail. The contents of the thesis are as follows: (1) based on the theory of finite-difference time-domain (FDTD), a human body model including skin, fat, muscle and bone is established, and the correlation between the complex dielectric constant and the frequency of human tissue is considered. The Debye model of biological medium was fitted. By implanting signal electrodes in human body surface and body surface, we studied the amplitude propagation characteristics of 1~100MHz frequency range, including body surface, body surface and body surface. A scheme of channel attenuation measurement based on pork is designed. Finally, the "co-location" effect of human communication channel ground electrode is investigated by using Balun isolation converter. (2) the transmitting signal electrode is implanted into the head, and the body surface of the human body is studied when the 45MHz communication frequency of the brain-computer interface link is studied. The distribution of the relative electric field intensity near the surrounding area is analyzed, and the changes of the surface electric field at different phases of the sinusoidal wave are analyzed. On this basis, the influence of different frequencies of sinusoidal wave 3MHz ~ 45MHz and 2400MHz on the electric field distribution of human body is studied. In addition, the amplitude attenuation and group delay characteristics of head-heart, head-arm, head-leg brain-computer interface link channel are studied. (3) the nonuniform media model of cylindrical human arm is established, including forearm, joint and upper arm. The dynamic channel fading of arm bending 0/180deg~150deg is studied, and the channel attenuation measurement scheme based on human body is designed. The arm bending angle and the influence of metal box on channel propagation signal occlusion are analyzed. In addition, in the research of human dynamic link, this paper has established 32 frames of human walking posture model to study the human abdomen and head at specific frequencies. The dynamic fading characteristics of the typical link channel between the abdomen wrist and the abdomen ankle. (4) the link budget the communication distance the transmission rate and the required transmission power of the actual human communication system are studied. In addition, the whole frame design of the project "Human Communication Image Transmission system", which is developed by the practice unit, is introduced, and on this basis, the image transmission rate and the BER index of the prototype are tested. The actual image transmission effect of human body communication system is ideal. At the end of the paper, the research results are summarized and the future research directions are prospected.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN911
[Abstract]:With the development of global aging, biomedical related wearable devices are attracting more and more attention. As a new communication technology, the human body region communication is to take the human body itself as the medium of signal transmission, to connect the various biosensor devices planted on the human body surface or body, to form a body area network which can deal with the human health information. Human communication channel modeling is the premise of exploring human region communication technology. A perfect human body channel model is very necessary to study the channel propagation characteristics. The main research content of this thesis is based on the National Natural Science Foundation of China "Research on Human Communication dynamic Channel Propagation characteristics based on Non-uniform medium Model" (No.61403366), Shenzhen basic Research "Human Communication dynamic Communication for wearable equipment" Theoretical Research and Modeling Analysis of the Channel Communication Mechanism "(No.JCYJ20140417113430695) related issues," The modeling and fading characteristics of human body channel in multi-layer non-uniform medium are studied in detail. The contents of the thesis are as follows: (1) based on the theory of finite-difference time-domain (FDTD), a human body model including skin, fat, muscle and bone is established, and the correlation between the complex dielectric constant and the frequency of human tissue is considered. The Debye model of biological medium was fitted. By implanting signal electrodes in human body surface and body surface, we studied the amplitude propagation characteristics of 1~100MHz frequency range, including body surface, body surface and body surface. A scheme of channel attenuation measurement based on pork is designed. Finally, the "co-location" effect of human communication channel ground electrode is investigated by using Balun isolation converter. (2) the transmitting signal electrode is implanted into the head, and the body surface of the human body is studied when the 45MHz communication frequency of the brain-computer interface link is studied. The distribution of the relative electric field intensity near the surrounding area is analyzed, and the changes of the surface electric field at different phases of the sinusoidal wave are analyzed. On this basis, the influence of different frequencies of sinusoidal wave 3MHz ~ 45MHz and 2400MHz on the electric field distribution of human body is studied. In addition, the amplitude attenuation and group delay characteristics of head-heart, head-arm, head-leg brain-computer interface link channel are studied. (3) the nonuniform media model of cylindrical human arm is established, including forearm, joint and upper arm. The dynamic channel fading of arm bending 0/180deg~150deg is studied, and the channel attenuation measurement scheme based on human body is designed. The arm bending angle and the influence of metal box on channel propagation signal occlusion are analyzed. In addition, in the research of human dynamic link, this paper has established 32 frames of human walking posture model to study the human abdomen and head at specific frequencies. The dynamic fading characteristics of the typical link channel between the abdomen wrist and the abdomen ankle. (4) the link budget the communication distance the transmission rate and the required transmission power of the actual human communication system are studied. In addition, the whole frame design of the project "Human Communication Image Transmission system", which is developed by the practice unit, is introduced, and on this basis, the image transmission rate and the BER index of the prototype are tested. The actual image transmission effect of human body communication system is ideal. At the end of the paper, the research results are summarized and the future research directions are prospected.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN911
【参考文献】
相关期刊论文 前6条
1 汪啸尘;张广浩;霍小林;;人体通信技术研究进展[J];中国生物医学工程学报;2015年03期
2 李佳宾;梁O，
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