文档介绍：南京邮电大学
硕士学位论文
基于MIMO系统的信道性能研究
姓名:尚志成
申请学位级别:硕士
专业:电磁场与微波技术
指导教师:徐立勤
2011-03
南京邮电大学硕士研究生学位论文摘要
摘要
MIMO(multiple-input-multiple-output)技术在提高无线链路的系统容量和传输速率方
面有着巨大的潜力,使得 MIMO 技术成为下一代移动通信的核心解决方案。在衰落信道中,
MIMO 技术可以在不增加带宽和发射功率的情况下成倍提高通信系统的信道容量,提高信
息传输速率和系统的传输可靠性。
论文首先简要介绍了无线衰落信道特性和 MIMO 信道模型,然后对系统相关性进行了
分析,包括空间相关性和极化相关性,并对影响相关性的参数进行了研究,分析角度功率
谱、角度扩展和天线间隔等参数对空间相关性的影响,分析了极化相关矩阵以及极化角度
对极化相关性的影响,然后对 MIMO 系统的信道容量进行了研究,分别对引入空间相关和
极化相关时的容量进行仿真,对影响信道容量的角度扩展、XPR 等参数进行分析,发现当
MIMO 系统中只存在空间相关时,角度扩展和天线间距对信道容量影响较大,当系统中引
入不同极化的天线时,XPR 参数对信道容量的影响要更大一些。在此基础上,研究了双极
化 MIMO 系统,分析了双极化 MIMO 系统服从不同衰落时的信道容量,对于影响信道容
量的参数进行分析,用 MATLAB 软件进行仿真,将其与单极化时的容量进行比较和分析,
得出在非理想环境下双极化 MIMO 系统有着很大的优势。
关键词:MIMO,衰落相关性,信道容量,双极化系统
I
南京邮电大学硕士研究生学位论文 Abstract
Abstract

Researches indicate that the technology of multiple-input multiple-output(MIMO) can
improve the performance of wireless system prominently, it can also improve the reliability of
the transmission channel to reduce bit error fading channel, MIMO technology can
elevate the channel capacity manifoldly without additional bandwidth and transmission power
consumptions, it can be also used to improve the transmission rate as well as munication.
First with a brief review on the properties of wireless fading channel and channel models of
Multi-Input and Multi-Output system. The correlation has been discussed at the third part, and
much simulations have been done about spatial correlation and polarized correlation,including
the parameters angle spread(AS)and antenna spacing under different power azimuth spectrum.
The last part starts with simulating the capacity of single-polarized MIMO system, taking
account of spatial correlation and polarization correlation, and the parameters (such as XPR,
polarized angle and so on) which have impact on capacity have been analyzed ,then the
simulations about capacity of dual-polarized MIMO system have been studied , it concludes that
when we take