【摘要】：時(shí)間反演(Time Reversal,TR)技術(shù)能使超寬帶(Ultrawideband,UWB)電磁波信號(hào)實(shí)現(xiàn)時(shí)間和空間同步聚焦,從而能簡(jiǎn)化接收端復(fù)雜度、降低發(fā)射功率、減小碼間干擾以及提高信噪比等。隨著對(duì)高質(zhì)量無(wú)線通信需求的日益增長(zhǎng),時(shí)間反演超寬帶(TR-UWB)通信技術(shù)可望成為未來(lái)無(wú)線通信的關(guān)鍵技術(shù)之一,因而對(duì)其的研究也日趨活躍。研究TR-UWB電磁波信道特性,并進(jìn)一步建立信道模型,就成為了TR-UWB通信的重要研究?jī)?nèi)容。目前大多數(shù)的研究是非時(shí)變下的TR-UWB,但對(duì)于實(shí)際的無(wú)線通信系統(tǒng),時(shí)變無(wú)線通信環(huán)境才是最常見(jiàn)的情況,因此時(shí)變環(huán)境下TR-UWB的研究顯得尤為重要。研究時(shí)變環(huán)境下的TR-UWB,首先應(yīng)該從其信道特性入手進(jìn)行研究,找出其規(guī)律性;其次是通過(guò)對(duì)這些特性的研究,并結(jié)合時(shí)不變情況下的TR-UWB一般時(shí)空同步聚焦模型,盡可能找出一個(gè)更符合時(shí)變環(huán)境的TR-UWB信道模型。本論文采用基于時(shí)域有限差分方法(Finite Difference Time Domain,FDTD)的電磁仿真平臺(tái),進(jìn)行了室內(nèi)時(shí)變環(huán)境下的TR-UWB信道特性研究。本課題研究首先基于本團(tuán)隊(duì)開(kāi)發(fā)的兩個(gè)電磁仿真平臺(tái),進(jìn)行平臺(tái)篩選,選擇仿真精度和效率相對(duì)更高的仿真平臺(tái)進(jìn)行后續(xù)的信道特性研究。接下來(lái),利用所選擇的仿真平臺(tái),對(duì)散射體移動(dòng)情況下的室內(nèi)時(shí)變TR-UWB電磁波傳播特性(主要包括聚焦特性)進(jìn)行研究,得到了一些有價(jià)值的研究成果。論文共分五章,主要內(nèi)容如下:第一章介紹課題研究的背景、意義、當(dāng)前TR-UWB信道特性的研究現(xiàn)狀與本文的主要研究?jī)?nèi)容。第二章介紹仿真原理和工具,并給出仿真平臺(tái)的選擇以及精度和效率的檢驗(yàn)。第三章介紹課題研究的信道特性參數(shù),主要包括時(shí)間壓縮率、聚焦增益、空間相關(guān)系數(shù)以及仿真環(huán)境的布置和具體的仿真步驟。第四章提取仿真空間中所設(shè)置的目標(biāo)點(diǎn)和觀察點(diǎn)的信道參數(shù),分析了信道參數(shù)的變化趨勢(shì)并總結(jié)規(guī)律。主要對(duì)目標(biāo)點(diǎn)以及周圍多個(gè)觀察點(diǎn)處的信道參數(shù)進(jìn)行綜合分析和對(duì)比分析,并據(jù)此得出一些有價(jià)值的結(jié)論。最后一章對(duì)論文工作進(jìn)行總結(jié),并對(duì)今后工作進(jìn)行展望。
[Abstract]:Time inversion (Time Reversal,TR) technology can realize time and space synchronous focusing of ultra-wideband (Ultrawideband,UWB) electromagnetic signals, which can simplify the complexity of receiver, reduce transmission power, reduce inter-symbol interference and improve signal-to-noise ratio (SNR). With the increasing demand for high quality wireless communication, time inversion ultra-wideband (TR-UWB) communication technology is expected to become one of the key technologies in future wireless communication, so the research on it is becoming more and more active. The study of TR-UWB electromagnetic channel characteristics and further establishment of channel model has become an important research content of TR-UWB communication. At present, most of the researches on TR-UWB, are non-time-varying, but for practical wireless communication systems, time-varying wireless communication environment is the most common case, so the study of TR-UWB in time-varying environment is particularly important. The study of TR-UWB, in time-varying environment should begin with its channel characteristics and find out its regularity. Secondly, by studying these characteristics and combining with the general spatio-temporal focusing model of TR-UWB under time-invariant condition, we can find out a TR-UWB channel model which is more suitable for time-varying environment as far as possible. In this paper, the electromagnetic simulation platform based on finite-difference time-domain method (Finite Difference Time Domain,FDTD) is used to study the characteristics of TR-UWB channel in indoor time-varying environment. Firstly, based on the two electromagnetic simulation platforms developed by the team, the platform is screened, and the simulation platform with higher simulation accuracy and efficiency is selected to study the channel characteristics. Then, using the selected simulation platform, the propagation characteristics (including focusing characteristics) of indoor time-varying TR-UWB electromagnetic wave in the case of scatterer moving are studied, and some valuable research results are obtained. The thesis is divided into five chapters. The main contents are as follows: the first chapter introduces the background and significance of the research, the current research status of TR-UWB channel characteristics and the main research content of this paper. The second chapter introduces the simulation principle and tools, and gives the choice of simulation platform and the test of accuracy and efficiency. In chapter 3, the channel characteristic parameters are introduced, including time compression ratio, focus gain, spatial correlation coefficient, simulation environment layout and simulation steps. In chapter 4, the channel parameters of the target point and the observation point in the simulation space are extracted, and the variation trend of the channel parameters is analyzed and the rules are summarized. The channel parameters of the target point and the surrounding observation points are analyzed and compared, and some valuable conclusions are obtained. The last chapter summarizes the work of the thesis and looks forward to the future work.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN925

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