【摘要】：近年來,人體通信逐漸成為醫(yī)療領(lǐng)域的一項更加新穎的技術(shù),這項新的技術(shù)包含了無線通信與生物電磁方面的諸多領(lǐng)域。人體通信以人體作為主要的傳輸信道,相比傳統(tǒng)的無線信道以空氣等作為媒質(zhì),具有更加復(fù)雜的研究方向和內(nèi)容。人體信道是人體通信研究的重中之重,希望通過本文的研究能對人體通信的發(fā)展起到一定的促進(jìn)作用,進(jìn)而提高人類的健康水平。本篇文章的主要工作如下:首先,詳細(xì)分析了時域有限差分方法的使用步驟與原理,從穩(wěn)定性條件、單元格大小的確定、吸收邊界條件等方面展開分析。接著,分不同的頻率段提出了不同路徑損耗模型,在頻率較高的UWB、MICS、ISM等頻段提出了對數(shù)型路徑損耗模型和指數(shù)型路徑損耗模型。在HBC頻段提出了分段的路徑損耗模型。然后,基于XFDTD軟件和時域有限差分算法對人體信道進(jìn)行三維建模,不同于以往研究所使用的簡單幾何形狀組成的人體模型,本文采用了更加接近人體組織參數(shù)和形狀的人體模型,在人體模型表面上放置發(fā)射點和186個接收點仿真人體體表信道,對所提出的信道模型進(jìn)行驗證。最后,在已驗證的信道模型基礎(chǔ)上分析人體信道的特性,主要分析了不同頻率、不同傳播距離以及改變收發(fā)點到人體表面間距、不同人體組織下人體信道的特性改變。并采用簡單圓柱體建立人體的手臂模型對體表信道的傳播特性進(jìn)行分析。仿真結(jié)果表明:人體信道在高頻段通常符合對數(shù)路徑損耗模型,而在HBC頻段則為分段直線的路徑損耗模型。證明了,人體軀干部位頻率越大路徑損耗越小,傳播距離增大路徑損耗變大,收發(fā)點到人體表面距離越大路徑損耗越小,由此驗證了人體組織對信道特性的重要影響,通過對人體不同部位的仿真證明了不同人體組織對路徑損耗的影響不同,以及通過手臂模型的仿真表明了人體體表信道的表面波特性。
[Abstract]:In recent years, human body communication has gradually become a more novel technology in medical field. This new technology includes many fields in wireless communication and bio-electromagnetism. Human body communication takes human body as the main transmission channel. Compared with the traditional wireless channel using air as the medium, it has more complex research direction and content. The channel of human body is the most important in the research of human body communication. It is hoped that the research in this paper can promote the development of human communication and improve the level of human health. The main work of this paper is as follows: firstly, the steps and principles of finite-difference time-domain (FDTD) method are analyzed in detail, including stability conditions, cell size determination, absorbing boundary conditions and so on. Then, different path loss models are proposed in different frequency segments, and logarithmic path loss models and exponential path loss models are proposed in UWB,MICS,ISM and other frequency bands. A piecewise path loss model is proposed in the HBC band. Then, based on XFDTD software and finite-difference time-domain (FDTD) algorithm, three-dimensional modeling of human channel is carried out, which is different from the human body model composed of simple geometric shapes used in previous studies. In this paper, a human model, which is closer to the parameters and shape of human body tissue, is used to simulate the body surface channel by placing the emissive points and 186 receiving points on the surface of the human body model, and the proposed channel model is verified. Finally, based on the verified channel model, the characteristics of human body channel are analyzed, including different frequency, different propagation distance, changing the distance between receiving point and human surface, and the characteristic change of human body channel under different human tissues. A simple cylinder is used to build the arm model to analyze the propagation characteristics of the body surface channel. The simulation results show that the human channel usually conforms to the logarithmic path loss model in the high frequency segment, while the path loss model in the HBC band is a piecewise straight line path loss model. It is proved that the greater the frequency of the human body is, the smaller the path loss is, the greater the propagation distance is, and the smaller the path loss is. The larger the distance from the receiving point to the surface of the human body, the smaller the path loss, thus validating the important influence of the human tissue on the channel characteristics. Through the simulation of different parts of the human body, it is proved that different human tissues have different effects on the path loss, and the simulation of the arm model shows the surface wave characteristics of the body surface channel of the human body.
【學(xué)位授予單位】：南京郵電大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN911

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2 康雯;無線人體通信若干關(guān)鍵技術(shù)研究[D];浙江大學(xué);2012年

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本文編號：2455707