【摘要】：隨著全球老齡化的發(fā)展,與生物醫(yī)療相關(guān)的可穿戴設(shè)備越來越受到人們的密切關(guān)注。人體區(qū)域通信作為一項(xiàng)新型的通信技術(shù),是把人體本身作為信號傳輸?shù)拿浇?將植在人體體表或體內(nèi)各種生物傳感設(shè)備連接起來,組成一個(gè)能夠處理人體健康信息的體域網(wǎng)。人體通信信道建模是探索人體區(qū)域通信技術(shù)的前提,一個(gè)完善的人體信道模型對于研究信道傳播特性是非常有必要的。本論文的主要研究內(nèi)容是基于國家自然科學(xué)基金"基于非均勻介質(zhì)模型的人體通信動態(tài)信道傳播特性研究"(No.61403366),深圳市基礎(chǔ)研究"用于穿戴式設(shè)備的人體通信動態(tài)信道傳播機(jī)制的理論研究與建模分析"(No.JCYJ20140417113430695)相關(guān)課題,重點(diǎn)研究了多層非均勻介質(zhì)人體信道建模及其衰落特性。全文內(nèi)容安排如下:(1)基于時(shí)域有限差分的原理,建立包括皮膚、脂肪、肌肉、骨骼等多層非均勻介質(zhì)人體計(jì)算模型,考慮人體組織復(fù)介電常數(shù)與頻率的相關(guān)性,擬合了生物介質(zhì)Debye模型。通過在人體體表、體內(nèi)植入信號電極,研究1～100MHz頻率范圍體表—體表、體表—體內(nèi)、體內(nèi)—體表、體內(nèi)—體內(nèi)四種植入信道幅度傳播特性,并設(shè)計(jì)了基于豬肉的信道衰減測量方案。最后,使用Balun隔離變換器探究了人體通信信道地電極的"共地"影響。(2)在頭部植入發(fā)射信號電極,研究了腦機(jī)接口鏈路45MHz通信頻率時(shí)人體體內(nèi)、體表、周圍附近相對電場強(qiáng)度分布,并分析激勵(lì)源正弦波不同相位時(shí)刻體表電場變化。在此基礎(chǔ)上研究正弦波3MHz、45MHz、403.5MHz和2400MHz不同頻率對人體電場分布影響。此外,還研究了頭部—心臟、頭部—手臂、頭部—腿部腦機(jī)接口鏈路信道的幅度衰減和群延遲特性。(3)建立圓柱形人體手臂非均勻介質(zhì)模型,包括前臂、關(guān)節(jié)及上臂部分,研究手臂彎曲0/180deg~150deg動態(tài)信道衰落,并設(shè)計(jì)基于人體的信道衰減測量方案,分析手臂彎曲角度,以及金屬盒對信道傳播信號遮擋影響。此外,在人體動態(tài)鏈路研究方面,本文建立了 32幀人體走路姿態(tài)模型,研究特定頻率下,人體腹部—頭部、腹部—手腕和腹部—腳踝的典型鏈路信道動態(tài)衰落特性。(4)研究實(shí)際人體通信系統(tǒng)性能相關(guān)的鏈路預(yù)算、通信距離、傳輸速率以及所需發(fā)射功率等問題。此外,介紹了實(shí)習(xí)單位參與研發(fā)的"人體通信圖像傳輸系統(tǒng)"項(xiàng)目整體架構(gòu)設(shè)計(jì),并在此基礎(chǔ)上完成對樣機(jī)圖像傳輸速率、信息誤碼率指標(biāo)測試,人體通信系統(tǒng)實(shí)際圖像傳輸效果比較理想。論文最后對全文取得的研究成果進(jìn)行總結(jié),并就以后需要深入研究的方向進(jìn)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.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN911

【參考文獻(xiàn)】

相關(guān)期刊論文 前6條

1 汪嘯塵;張廣浩;霍小林;;人體通信技術(shù)研究進(jìn)展[J];中國生物醫(yī)學(xué)工程學(xué)報(bào);2015年03期

2 李佳賓;梁O，

本文編號：2292234