摘要MIMO(多输入多输出）技术是指在发射端和接收端分别使用多个发射天线和接收天线，实现信号的多途径传送和接收，从而改善通信质量。MIMO技术能够在不额外增加系统带宽和天线发射功率的情况下显著的提高系统信道容量，改善系统性能，视为下一代移动通信的核心技术。84516

研究MIMO 信道容量是对MIMO 通信系统进行深入分析的基础，本文在已有的理论研究基础上，研究了MIMO系统的基本模型和信道容量的公式推导，开展了MIMO无线信道有关的信道容量方面的研究。研究MIMO信道容量注水算法的实现原理并通过MATLAB仿真实现MIMO信道的注水算法，在已有的注水算法基础上研究瑞利衰落信道下不同天线数的信道容量的变化，结果表明注水能够自适应分配功率有效的提高信道的容量，在信噪比高的情况下更明显。对已实现的注水算法进行研究，在现有的理论基础上采用迭代注水算法，其实质就是多次执行相同的运算，分析迭代注水算法，并在高斯矢量信道的情况下，对迭代注水算法进行仿真并与经典注水算法进行比较。

毕业论文关键字：MIMO；信道容量；注水；迭代注水

Abstract MIMO (multi input and multi output) technology is to use multiple transmit antennas and receive antennas at the transmitter and receiver to realize the transmission and reception of the signals, thus improving the quality of communication。MIMO technology can significantly improve the system channel capacity and improve the system performance, which is considered as the core technology of the next generation mobile communication system without increasing the system bandwidth and antenna transmit power。

MIMO channel capacity study is in-depth analysis based on MIMO communication systems, this paper on the existing theory on the basis of the research, analyzes the MIMO system model and channel capacity formula is derived, MIMO wireless channel is related to the channel capacity is studied。Understand the capacity of MIMO channel waterfilling algorithm implementation principle and realize MIMO channel water filling algorithm by MATLAB simulation, in the existing water filling algorithm based on study Rayleigh fading channel under the channel capacity of different antenna number changes, the analysis results。To improve water flooding algorithm has been implemented, on the basis of the existing theory by using the iterative water filling algorithm, its essence is to repeatedly execute the same computation, analysis of the iterative water filling algorithm and Gaussian vector channel, the iterative water filling algorithm simulation and compared with the classical water filling algorithm。

Keywords: multi user MIMO, channel capacity research, water injection algorithm, iterative water injection algorithm

目录

第一章  绪论 1

1。1 课题研究背景 1

1。2 MIMO技术的发展史 1

1。3 MIMO技术的研究现状 2

1。4 本文主要研究内容和章节安排 3

第二章  MIMO系统的基本原理和基本模型 4

2。1 MIMO系统的基本原理 4

2。2 MIMO系统的基本模型 4

2。3 MIMO的主要技术 5

2。3。1 MIMO技术的目的 5

2。3。2 空间复用 6

2。3。3 空间分集 6

2。3。4 波束赋形 7

2。3。5 预编码