空域相关对Massive MIMO系统性能影响的研究

发布时间：2018-05-27 18:03

本文选题：Massive + MIMO　；参考：《浙江大学》2014年硕士论文

【摘要】：Massive MIMO (Multiple-Input-Multiple-Output)作为传统(?)MIMO技术的延伸,可以大幅度提升吞吐率和能量效率,是未来无线通信的一个重要研究方向。Massive MIMO需要在基站采用大规模的阵列来服务有限的终端用户,这使基站天线阵列的尺寸大幅度增大,安装难度也相应大幅增加。本文重点研究基站端阵列天线的空域相关和互耦对Massive MIMO系统性能的影响。在此基础上,本文进一步研究了基于双极化天线的Massive MIMO系统。基于双极化天线的Massive MIMO系统可以在不改变系统性能的情况下减小基站端的阵列占用面积。本文首先在多天线理论技术的基础上对Massive MIMO系统的基本特征进行分析,包括时分复用双工的上下行传输、导频污染的起因及其影响、预编码算法及其性能等。其次,在阵列天线指数相关的条件下,本文分析了基于单极化天线阵列的Massive MIMO系统。理论推导证明此系统与传统的无相关单极化Massive MIMO系统有相同的渐进SIR (Signal to Interference Ratio)性能。对理论推导的结论我们进行了仿真验证,证明了该结论的正确性。在此基础上,我们将相关和互耦与基站阵列结构设计相结合,仿真对比了有无基站阵列面积限制两种情况下的用户速率。通过对基站端阵列面积受限情况的分析我们发现,随着天线数的上升,天线彼此之间的相关和耦合效应不断增强,单位用户速率趋于饱和。最后,本文分析了旨在节省基站端阵列面积的基于双极化天线的Massive MIMO系统,分析并验证了其相对于传统基于单极化天线的Massive MIMO系统的空间利用率的提升。
[Abstract]:Massive MIMO Multiple-Input-Multiple-Output (Massive MIMO), as an extension of traditional MIMO technology, can greatly improve throughput and energy efficiency. It is an important research direction of wireless communication in the future. Massive arrays are needed to serve limited end users in base stations. This greatly increases the size of base station antenna array and the difficulty of installation. This paper focuses on the effect of spatial correlation and mutual coupling of base station antenna array on the performance of Massive MIMO system. On this basis, the Massive MIMO system based on dual polarization antenna is further studied in this paper. The Massive MIMO system based on dual polarization antenna can reduce the array occupied area of base station without changing the system performance. In this paper, the basic characteristics of Massive MIMO system are analyzed on the basis of multi-antenna theory, including the uplink and downlink transmission of time division multiplexing (TDM), the cause and influence of pilot pollution, the precoding algorithm and its performance, etc. Secondly, under the condition of exponential correlation of array antenna, the Massive MIMO system based on single polarization antenna array is analyzed in this paper. The theoretical derivation proves that the system has the same asymptotic SIR signal to Interference Ratio) performance as the traditional uncorrelated unipolar Massive MIMO system. The conclusion of theoretical derivation is verified by simulation, and the correctness of the conclusion is proved. On this basis, we combine the correlation and mutual coupling with the base station array structure design, and compare the user rate with or without the base station array area limitation. By analyzing the limited area of the array at the base station, we find that with the increase of the number of antennas, the correlation and coupling effect between antennas are increasing, and the unit user rate tends to saturation. Finally, this paper analyzes the dual-polarization antenna based Massive MIMO system which aims to save the base station end array area, and analyzes and verifies the improvement of the space utilization ratio compared with the traditional Massive MIMO system based on single-polarization antenna.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN919.3

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