LTE-A系统中的3D-MIMO信道模型仿真及系统性能评估

发布时间：2019-03-05 20:58

【摘要】：伴随着无线通信技术的迅猛发展,用户群对通信系统的吞吐量和速率提出了更高的要求。人们深入研究了多输入多输出(MIMO)技术在容量上的巨大优势,将其运用在通信系统中作为关键技术。MIMO技术不仅可以对空间特性充分利用,还可以提高系统容量而不增加发射功率和带宽。MIMO技术与提升通信系统容量以及通信系统的无线信道紧密相关,但是之前人们主要基于二维平面展开对于MIMO信道模型的研究。为了能够更加精确地模拟现实环境中MIMO信道,人们开始逐渐关注3D-MIMO的信道建模。 3D-MIMO信道模型中大幅度调整了LOS/NLOS的概率建模模型,同时分别进行与其相对应的LOS、NLOS、Outdoor-to-indoor情形下的路径损耗公式建模。此外,3D-MIMO信道模型与2D-MIMO信道模型相比较,建模了对垂直方向接收端到达角(EOA)、垂直方向发射端离开角(EOD)这两个重要的角度变量,因此能够更加准确地对3D环境下的MIMO信道模型进行模拟。我们为了深入的研究3D-MIMO的系统性能,搭建了在LTE-Advanced系统下3D-MIMO言道仿真模型,结合3D-MIMO下的波束赋形、预编码、多用户(MU)配对调度传输以及信道质量指示(CQI)的反馈等关键技术方案,对比研究UMi及UMa场景、不同天线配置、多用户MIMO不同配对用户数目下系统的信干噪比、平均频谱效率和5%小区边缘频谱效率等多项系统性能指标,从多方面分析3D-MIMO的系统性能。仿真结果表明,在不同场景、不同传输模式、不同天线配置下,3D-MIMO的小区平均频谱效率(ASE)和边缘频谱效率(ESE)相对于2D-MIMO均有较大提升
[Abstract]:With the rapid development of wireless communication technology, users put forward higher requirements for throughput and rate of communication system. In-depth study on the huge advantages of multi-input multi-output (MIMO) technology in the capacity of the communication system as a key technology. MIMO technology can not only make full use of the spatial characteristics, but also make full use of the spatial characteristics of the multi-input multi-output MIMO technology. MIMO technology is closely related to improving the capacity of communication system and the wireless channel of communication system, but the research of MIMO channel model based on two-dimensional plane is mainly based on two-dimensional plane. In order to simulate the real-world MIMO channel more accurately, people begin to pay more attention to the channel modeling of 3D-MIMO. In the 3D-MIMO channel model, the probability modeling model of LOS/NLOS is greatly adjusted, and the path loss formula in the corresponding LOS,NLOS,Outdoor-to-indoor case is modeled separately. In addition, the 3D-MIMO channel model is compared with the 2D-MIMO channel model, and the two important angle variables, (EOD), are modeled for the vertical receiving end-to-arrival angle (EOA), vertical transmitting end off-angle (EOD). Therefore, the MIMO channel model in 3D environment can be simulated more accurately. In order to deeply study the system performance of 3D-MIMO, we set up the simulation model of 3D-MIMO speech in LTE-Advanced system, combined with beamforming and precoding under 3D-MIMO, The key technology schemes such as multi-user (MU) pairing scheduling transmission and the feedback of channel quality indicator (CQI) are compared to study the signal-to-interference-noise ratio (SNR) of the system under the conditions of UMi and UMa scenarios, different antenna configurations, and multi-user MIMO with different number of pairing users. The system performance of 3D-MIMO is analyzed from many aspects, such as average spectrum efficiency and 5% cell edge spectrum efficiency. The simulation results show that under different scenarios, different transmission modes and different antenna configurations, the cell average spectrum efficiency (ASE) and edge spectrum efficiency (ESE) of 3D-MIMO are greatly improved compared with 2D-MIMO.
【学位授予单位】：北京邮电大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN919.3

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