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Adaptive SC-FDMA Waveform for Application in Ka band Satellite Communications Links.

机译：适用于Ka波段卫星通信链路的自适应SC-FDMA波形。

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摘要

Satellite communication systems are specified for a certain and usually relatively high reliability. To achieve the reliability, margins are added to the system design to account for low-probability, high propagation loss conditions. Often the parameters of the system are fixed, e.g., causing the system to operate at the power levels or modulation required to close the link during a fade. This represent a disadvantage during the non-fade times. An alternative approach allows the data rate to increase during the higher probability clear weather events. This type of system adapts to the changing conditions.;This work attempts to quantify the advantages of an adaptive satellite communications system over one that cannot be changed. A theoretical treatment is used to show this advantage.;This work develops a metric named the spectral efficiency improvement factor that relates the average spectral efficiency of the adaptive system to the deterministic spectral efficiency of the fixed system. The spectral efficiency improvement factor is used to examine two cases in depth. First, the value of adaptation as subsystem components such as antennas are considered. As part of this first examination, high and low satellite to ground station look angles are also simulated. Second, regions of the continental United States are determined where adaptive systems are most advantageous.;The Spectral Efficiency Improvement factor shows adaptivity is more advantageous in: 1) climates with a high rain rate, 2) high RF carrier frequency, 3) systems that use antennas with horizontal polarization, and 4) at low elevation angles from the satellite to the groundstation.;This work also discusses an implementation of a SC-FDMA waveform that has correlation properties with a single main peak even though the time domain representation contains multiple repeats of the user symbols.;This work implements a modem in MATLAB and a modulator in VHDL for initial testing of the waveform.
机译：规定卫星通信系统具有一定的，通常是较高的可靠性。为了获得可靠性，在系统设计中增加了余量，以解决低概率，高传播损耗的情况。通常，系统的参数是固定的，例如，导致系统在衰落期间以关闭链路所需的功率电平或调制来运行。这代表了在不褪色时间的缺点。一种替代方法允许在较高概率的晴天天气期间提高数据速率。这种类型的系统适应不断变化的条件。这项工作试图量化自适应卫星通信系统相对于无法改变的优点。通过理论上的处理来证明这一优势。这项工作开发了一种名为频谱效率改进因子的度量，该因子将自适应系统的平均频谱效率与固定系统的确定性频谱效率相关联。频谱效率提高因子用于深入研究两种情况。首先，考虑作为天线等子系统组件的适应性价值。作为第一次检查的一部分，还模拟了卫星的高低对地面站的视角。其次，确定美国大陆上最适合使用自适应系统的区域;频谱效率提高因子表明适应性在以下方面更具优势：1）高降雨率的气候; 2）高RF载波频率; 3）使用水平极化的天线，以及4）从卫星到地面站的仰角较低的天线。该工作还讨论了SC-FDMA波形的实现，即使时域表示包含多个，该波形也具有与单个主峰的相关特性用户符号的重复。这项工作实现了MATLAB中的调制解调器和VHDL中的调制器，用于波形的初始测试。

著录项

  • 作者

    White, Jeffrey Robert.;

  • 作者单位

    Florida Institute of Technology.;

  • 授予单位 Florida Institute of Technology.;
  • 学科 Electrical engineering.
  • 学位 Ph.D.
  • 年度 2016
  • 页码 256 p.
  • 总页数 256
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 农学（农艺学）;
  • 关键词

  • 入库时间 2022-08-17 11:40:09

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