本文選題：信道建模 + 多輸入多輸出　； 參考：《南京信息工程大學(xué)》2017年碩士論文

【摘要】：隨著智能移動(dòng)終端的快速普及,無線通信用戶的數(shù)量不斷增多,人們對(duì)數(shù)據(jù)傳輸速率的需求呈指數(shù)增長(zhǎng)。而寬帶系統(tǒng)的發(fā)展、數(shù)據(jù)速率的提高及各項(xiàng)服務(wù)的需求,使得信道建模成為一個(gè)研究熱點(diǎn)。本文主要圍繞基于三維(Three Dimensional, 3D)空間鏈路的信道建模及其車載應(yīng)用進(jìn)行分析,通過宏蜂窩3D空間域的信道建模,深入分析多輸入多輸出(Multiple Input Multiple Output,MIMO)天線陣列、多普勒頻移(Doppler Shift, DS)、功率譜密度(Power Spectral Density,PSD)、空間衰落相關(guān)性(Spatial Fading Correlation, SFC)、信道容量等影響系統(tǒng)性能的各方面因素,為無線移動(dòng)通信系統(tǒng)的性能分析提供理論基礎(chǔ)。本文的研究工作主要分為以下四個(gè)方面:首先,針對(duì)室外宏小區(qū)(Macrocell)移動(dòng)通信環(huán)境下的多徑衰落問題,引入垂直分量進(jìn)而建立三維空間域的統(tǒng)計(jì)信道模型,提高了信道變化描述的準(zhǔn)確性。模型推導(dǎo)了在方位角、仰角平面的到達(dá)角度(Angle of Arrival, AOA)以及到達(dá)時(shí)延(Time of Arrival, TOA)概率密度函數(shù)的分析算法,給出電磁信號(hào)分別在移動(dòng)臺(tái)(Mobile Station, MS)以及基站(Base Station, BS)端的空時(shí)概率密度閉合理論式,深入分析影響空時(shí)特性的相關(guān)因素,為多徑信號(hào)在垂直維度的參數(shù)估計(jì)提供理論支持。其次,基于上述模型,將其MS附近的散射體衰減至二維平面內(nèi),構(gòu)建一個(gè)基于散射簇的三維統(tǒng)計(jì)信道模型。數(shù)值推導(dǎo)多徑衰落信道正向、反向鏈路的概率密度分布,包括到達(dá)角度、到達(dá)時(shí)延等;分析頻率變化引起的正向、反向信道鏈路多普勒頻移;數(shù)值仿真結(jié)果對(duì)比分析表明,所提出模型的信道參數(shù)估計(jì)符合理論及實(shí)際的通信環(huán)境,更全面地描述了多徑衰落信道的相關(guān)特性。然后,基于上述構(gòu)建的3D散射簇信道模型,在設(shè)置MIMO多天線的均勻線性陣列(Uniform Linear Array, ULA)和圓形陣列(Uniform Circular Array, UCA)基礎(chǔ)上,研究衰落信道的空時(shí)分布特性,深入分析波達(dá)信號(hào)不同方位角分布對(duì)散射信道中MIMO性能的影響,包括MIMO空間相關(guān)性、信道容量以及天線陣列配置。最后,針對(duì)室外無線信道視距(Line of Sight,LOS)/非視距(Non-Line of Sight,NLOS)傳輸環(huán)境下的車到車(Car-to-Car,C2C)通信,構(gòu)建一種基于標(biāo)準(zhǔn)街道散射的新型統(tǒng)計(jì)性車載通信模型,其移動(dòng)發(fā)送端(Mobile Transmitter, MT)與移動(dòng)接收端(Mobile Receiver, MR)均處于移動(dòng)狀態(tài)。數(shù)值推導(dǎo)到達(dá)角、發(fā)射角(Angle of Departure, AOD)以及多普勒PSD等的函數(shù)解析式;引入?yún)⒖夹诺滥Ｐ偷亩嗥绽諈⒘坎⑦M(jìn)行對(duì)比分析,證實(shí)模型的合理性與可行性;采用控制變量法研究影響多普勒PSD、時(shí)間自相關(guān)函數(shù)(Autocorrelation Function, ACF)的相關(guān)因素。結(jié)果表明仿真信道模型的統(tǒng)計(jì)特性與參考信道模型相符,創(chuàng)造性地研究了街道移動(dòng)通信環(huán)境下的信道模型,更大程度地拓展了室外C2C車載通信的研究與應(yīng)用。
[Abstract]:With the rapid popularization of intelligent mobile terminals, the number of wireless communication users is increasing, and the demand for data transmission rate is increasing exponentially. With the development of broadband system, the improvement of data rate and the demand of various services, channel modeling has become a hot topic. In this paper, the channel modeling based on 3D three dimensional (3D) spatial link and its vehicle application are analyzed. Through the channel modeling in 3D space domain of macrocellular, the multi-input and multi-output multiple Input Multiple output MIMO-antenna array is deeply analyzed. Doppler shift, DSD, Power Spectral density, spatial fading correlation, SFCU, channel capacity and other factors that affect the performance of the system provide a theoretical basis for the performance analysis of wireless mobile communication systems. The research work in this paper is divided into the following four aspects: firstly, aiming at the multipath fading problem in the outdoor Macrocell-based mobile communication environment, the vertical component is introduced and the statistical channel model in the three-dimensional domain is established. The accuracy of channel variation description is improved. The algorithm of analyzing the probability density function of angle of arrival (AOAA) and arrival time of Arrival( toOAA) in azimuth and elevation plane is derived. The theoretical formula of space-time probability density closure of electromagnetic signals at mobile station (MS) and base station (BSs) is given. The related factors affecting space-time characteristics are analyzed in depth, which provides theoretical support for parameter estimation of multipath signals in vertical dimension. Secondly, based on the above model, the scattering body near MS is attenuated to a two-dimensional plane, and a three-dimensional statistical channel model based on scattering cluster is constructed. The probability density distribution of the multipath fading channel and the reverse link, including the angle of arrival, the arrival delay, etc., is derived numerically. The forward frequency shift caused by the frequency change is analyzed, and the numerical simulation results show that, The channel parameter estimation of the proposed model accords with the theoretical and practical communication environment, and describes the related characteristics of the multipath fading channel more comprehensively. Then, based on the above 3D scattering cluster channel model, the space-time distribution characteristics of fading channels are studied on the basis of uniform Linear Array, ULA) and uniform Circular Array, UCA) with MIMO multiple antennas. The effects of different azimuth distributions of the DOA signal on the MIMO performance in the scattering channel, including MIMO spatial correlation, channel capacity and antenna array configuration, are analyzed. Finally, a new statistical vehicle-borne communication model based on standard street scattering is constructed for vehicle-to-vehicle Car-to-car-to-C2C communication under outdoor wireless channel line-of-sight line of SightLoss / non-line-of-sight (Non-Line of SightLoss) transmission environment. Both the mobile transmitter (MTT) and the mobile receiver (MRM) are in mobile state. The analytical formulas of angle of arrival, angle of arrival, angle of arrival (AODs) and Doppler PSD are derived numerically, the Doppler parameters of the reference channel model are introduced and compared to verify the rationality and feasibility of the model. The influence factors of Doppler PSD, time autocorrelation function (ACFC) were studied by using control variable method. The results show that the statistical characteristics of the simulation channel model are consistent with the reference channel model, and the channel model under street mobile communication environment is studied creatively, which extends the research and application of outdoor C2C vehicular communication to a greater extent.
【學(xué)位授予單位】：南京信息工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN929.5

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