發(fā)布時間：2018-05-05 15:28

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

【摘要】：隨著智能移動終端的快速普及,無線通信用戶的數(shù)量不斷增多,人們對數(shù)據(jù)傳輸速率的需求呈指數(shù)增長。而寬帶系統(tǒng)的發(fā)展、數(shù)據(jù)速率的提高及各項服務的需求,使得信道建模成為一個研究熱點。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用進行分析,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,為無線移動通信系統(tǒng)的性能分析提供理論基礎。本文的研究工作主要分為以下四個方面:首先,針對室外宏小區(qū)(Macrocell)移動通信環(huán)境下的多徑衰落問題,引入垂直分量進而建立三維空間域的統(tǒng)計信道模型,提高了信道變化描述的準確性。模型推導了在方位角、仰角平面的到達角度(Angle of Arrival, AOA)以及到達時延(Time of Arrival, TOA)概率密度函數(shù)的分析算法,給出電磁信號分別在移動臺(Mobile Station, MS)以及基站(Base Station, BS)端的空時概率密度閉合理論式,深入分析影響空時特性的相關因素,為多徑信號在垂直維度的參數(shù)估計提供理論支持。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,構建一個基于散射簇的三維統(tǒng)計信道模型。數(shù)值推導多徑衰落信道正向、反向鏈路的概率密度分布,包括到達角度、到達時延等;分析頻率變化引起的正向、反向信道鏈路多普勒頻移;數(shù)值仿真結果對比分析表明,所提出模型的信道參數(shù)估計符合理論及實際的通信環(huán)境,更全面地描述了多徑衰落信道的相關特性。然后,基于上述構建的3D散射簇信道模型,在設置MIMO多天線的均勻線性陣列(Uniform Linear Array, ULA)和圓形陣列(Uniform Circular Array, UCA)基礎上,研究衰落信道的空時分布特性,深入分析波達信號不同方位角分布對散射信道中MIMO性能的影響,包括MIMO空間相關性、信道容量以及天線陣列配置。最后,針對室外無線信道視距(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,構建一種基于標準街道散射的新型統(tǒng)計性車載通信模型,其移動發(fā)送端(Mobile Transmitter, MT)與移動接收端(Mobile Receiver, MR)均處于移動狀態(tài)。數(shù)值推導到達角、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行對比分析,證實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、時間自相關函數(shù)(Autocorrelation Function, ACF)的相關因素。結果表明仿真信道模型的統(tǒng)計特性與參考信道模型相符,創(chuàng)造性地研究了街道移動通信環(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.
【學位授予單位】：南京信息工程大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN929.5

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本文編號：1848224