本文为瑞典查尔姆斯理工大学（作者：KARL RUNDSTEDT）的通信工程硕士论文，共79页。
本文研究了视距多输入多输出（MIMO）信道在降雨、大气折射率变化等气象条件下的衰落特性，已经在瑞典哥德堡的两个原型LOS-MIMO链路上进行了测量。结果表明，下雨条件的模型可以认为接收到的MIMO信号是完全相关衰减（fully correlated attenuation）。由大气折射率变化引起的折射衰落可以建模为相关多径衰落，特别是Rician衰落。随后，本文研究了在Rician信道中LOS-MIMO系统与传统单输入单输出(SISO)系统的性能和中断概率。分析了两种MIMO系统，线性迫零（ZF）系统和利用信道奇异值分解（SVD）的最优容量逼近系统。仿真表明，SVD系统能够提供比SISO系统更低或相似的中断概率，而ZF系统通过引入功率惩罚偏移来实现相同的中断概率。
The fading characteristics duringmeteorological conditions such as rain and variations of the atmosphericrefractivity for Line-of-Sight (LOS) Multiple-Input-Multiple-Output (MIMO)channels are investigated. Measurements have been performed on two prototypeLOS-MIMO links in Gothenburg,Sweden. It isshowed that rain can be modelled as a fully correlated attenuation of thereceived MIMO signal. Refractive fading, caused by variations of theatmospheric refractivity, can be modelled as correlated multipath fading andespecially as Rician fading. Later in the thesis, we investigated theperformance and outage probability of LOS-MIMO systems compared to conventionalSingle-InputSingle- Output (SISO) systems in a Rician channal. Two MIMO systemsare analyzed, a linear zero-forcing (ZF) system and an optimal(capacity-achieving) system using Singular Value Decomposition (SVD) of thechannel. It is shown from simulation that an SVD system offers lower or equaloutage probability than its SISO counterpart while the ZF system introduces apower penalty offset, given an equal probability of outage.
1 引言
2 微波系统
3 MIMO系统
4 微波传播
5 信道模型
6 数据测量
7 实验分析
8 讨论
9 结论
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