本文選題：無線局域網(wǎng)　切入點：802.11n　出處：《西南交通大學》2014年碩士論文

【摘要】：隨著移動通信的快速發(fā)展,現(xiàn)在對通信系統(tǒng)的帶寬,容量以及通信質量等的要求越來越高,而能滿足上述要求的關鍵技術之一正是多輸入多輸出(MIMO, Multiple-Input and Multiple-Out)技術。MIMO技術是實現(xiàn)高數(shù)據(jù)速率、大系統(tǒng)容量、高傳輸質量的空間分集技術,因此MIMO技術將非常有可能成為未來高速移動通信系統(tǒng)中的重點研究的通信技術之一,并將發(fā)揮出特有的優(yōu)勢。 在MIMO系統(tǒng)中,若各接收天線信號不相關,則可以較好的提高系統(tǒng)的抗衰落性,并且能通過增加天線數(shù)目來提高系統(tǒng)容量,可以極大的提高頻譜利用率。但是由于天線之間的間隔不可能無限大,所以各條路徑上的接收信號之間就勢必會具有一定的相關性。因此為了更深入地研究MIMO技術和評估系統(tǒng)性能的好壞以及算法的優(yōu)劣,有必要研究MIMO信道特性,并建立適合相應場景的信道模型。 首先,本文介紹了寬帶無線信道模型的研究成果和有待解決的問題。分析了無線衰落信道的特性、大尺度衰落、小尺度衰落以及其包絡特性。其中重點介紹了MIMO信道中關注的小尺度衰落。 其次,對無線信道建模的基本理論知識做了相關介紹,包括：無線信道建模的關鍵參數(shù)、MIMO信道建模的分類、典型的MIMO空間信道模型以及MIMO信道空間相關性。從相關矩陣和相關系數(shù)兩方面分析了MIMO信道的相關性,考慮了高斯分布、均勻分布以及拉普拉斯分布這三種接收信號可能的角度功率譜分布,詳細的給出了相應的信道空間相關系數(shù)的計算公式,并進行了仿真。結果表明影響天線之間的相關性因素主要有：天線間隔、到達角(AOA, Angle Of Arrival)、離開角(AOD, Angle Of Departure)、角度擴展(AS, Angular Spread)和角度功率譜(PAS, Power Azimuth Spectrum)等。 最后,詳細闡述了信道模型參數(shù),具體刻畫了TGn MIMO信道的具體實現(xiàn)過程,并且給出了信道模型的詳細仿真思路和仿真流程,對信道模型的特性如、時域響應、累積分布函數(shù)圖、功率時延譜、多普勒頻移以及相關性等進行了分析和驗證。表明了該信道模型的合理性,符合無線局域網(wǎng)的實際傳播環(huán)境。將信道模塊加入系統(tǒng)進行整體的仿真,比較了不同天線配置、不同信道模型下的PER性能,得出了一些參考結論；最后考慮了在高速環(huán)境下基于上述模型的信道建模,仿真了其信道特性,驗證了模型的合理性。
[Abstract]:With the rapid development of mobile communication, the requirements of bandwidth, capacity and communication quality of communication system are becoming higher and higher.One of the key technologies that can meet the above requirements is Multiple-Input and Multiple-Out.MIMO, which is a spatial diversity technology with high data rate, large system capacity and high transmission quality.Therefore, MIMO technology will be one of the most important communication technologies in the future high speed mobile communication systems, and will play a unique advantage.In MIMO system, if the received antenna signal is not correlated, it can improve the anti-fading performance of the system, and can increase the system capacity by increasing the number of antennas, which can greatly improve the spectrum efficiency.However, because the interval between antennas can not be infinite, the received signals on each path are bound to have certain correlation.Therefore, in order to study the performance of MIMO and evaluate the performance of the system, it is necessary to study the characteristics of MIMO channel and establish a channel model suitable for the corresponding scenarios.Firstly, this paper introduces the research results of broadband wireless channel model and the problems to be solved.The characteristics of wireless fading channel, large scale fading, small scale fading and its envelope are analyzed.The small scale fading in MIMO channel is emphasized.Secondly, the basic theoretical knowledge of wireless channel modeling is introduced, including the classification of the key parameters of wireless channel modeling, the typical MIMO spatial channel model and the spatial correlation of MIMO channel.The correlation of MIMO channel is analyzed from two aspects of correlation matrix and correlation coefficient. Gao Si distribution, uniform distribution and Laplace distribution are considered as three possible angular power spectrum distributions of received signals.The calculation formula of channel spatial correlation coefficient is given in detail, and the simulation is carried out.The results show that the main factors affecting the antenna are: antenna spacing, arrival angle, Angle of Arrivala, AODO, Angle of Departure, angle spread AS, Angular spread) and angle power spectrum pass, Power Azimuth spectrum, etc. The results show that the correlation factors between antennas are: antenna spacing, AOAA, Angle of Arrivala, AODO, Angle of Departure, angle spreading ASS, Angular spread) and so on.Finally, the parameters of the channel model are described in detail, and the implementation process of the TGn MIMO channel is described in detail, and the detailed simulation idea and simulation flow of the channel model are given. The characteristics of the channel model such as time-domain response, cumulative distribution function diagram are given.Power delay spectrum, Doppler shift and correlation are analyzed and verified.It shows the rationality of the channel model and accords with the actual propagation environment of WLAN.The channel module is added to the system for overall simulation, and the PER performance under different antenna configurations and different channel models is compared, and some reference conclusions are obtained. Finally, the channel modeling based on the above model in high-speed environment is considered.The channel characteristics are simulated and the rationality of the model is verified.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN919.3

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本文編號：1720478