摘要多输入多输出(MIMO)传输的高频谱效率的传统上依赖于丰富的散射环境中多路复用增益,并不总是在视距(LOS)环境中,特别是在更高的微波频段。无线电频率的多输入输出（MIMO）传输方案预计由于他们的高频率使用效率将成为超高效的移动通信实例。另一方面，自从高射频带来大量传播损耗，导致了收缩的服务区域，这样有可能使视距系统出现。不过在LOS信道的多天线传输的信道容量有一个显著的退化，这个是一个复杂的问题。84514

论文研究了一种天线阵设计规则，阐述了一维或二维天线阵列的场景的LOS-MIMO系统,其保证了多路复用增益，并且在二维天线阵列情况下有严格的垂直约束。对最小天线阵列区域、条件数和信道容量进行了分析。接着分析了一个方正的天线阵列MIMO系统。通过在LOS信道中改变天线形态和信噪比来研究天线形态和信道容量的关系，也分析了纯LOS信道矩阵的奇异值和条件数。通过改变LOS信道的天线形态和信噪比，LOS-MIMO信道的电脑仿真结果显示了最优条件数和信道容量。

毕业论文关键词：LOS-MIMO；视距传输；天线；信道容量

Abstract The high spectrum efficiency of multiple-input multiple-output (MIMO) transmission traditionally depends on the high multiplexing gain in rich scattering environments, which will not always hold in the line-of-sight (LOS) environments, especially at higher microwave frequency band。 Multiple input/output (MIMO) transmission scheme with high wireless frequency will become a super efficient mobile instance。 On the other hand, since the high frequency brings a large number of propagation loss, it results in a contraction of the service area, it results in a contraction of the service area。 It may appear the line-of-sight system。 Because multi-antenna transmission channel capacity has a significant degradation in LOS-MIMO system, it is a complex problem。

In this paper, it studies an antenna array design rule that guarantee full multiplexing gain for LOS-MIMO systems with one and two dimensional antenna arrays in LOS scenarios, and the strict perpendicular constraint is released in the two-dimensional case。 The minimum antenna array area and condition number and capacity are also obtained to guide the practical system design。 Then it analyses a MIMO system with the square antenna array。 This paper studies the relationship between the antenna array and channel capacity for MIMO transmission in a LOS channel by changing the antenna array and SNR within the LOS channel。 It also performs an analysis of the singular value and condition number for MIMO pure LOS channel matrix。 Computer simulation results for the LOS-MIMO channel show the optimal channel capacity and the condition number when changing the antenna array and SNR in LOS。

Keywords: LOS-MIMO; Line-of-sight propagation; antenna; channel capacity

目  录

第一章  绪论 1

1。1 课题的研究背景 1

1。1。1 MIMO技术简介 1

1。1。2 LOS-MIMO技术概述 3

1。2 选题意义和研究内容 4

1。3 论文的结构 4

第二章  无线信道的特点 6

2。1 无线信道的物理模型 6

2。1。1 视距传输下的固定的发送和接收天线 6

2。1。2 视距传输下的移动天线 7

2。1。3 反射墙和固定天线 8

2。1。4 反射墙和移动天线