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Aluminum has become the material of choice for overhead transmission lines, surpassing copper due to its abundance and cost-effectiveness. The most prevalent type is the aluminum conductor, steel-reinforced (ACSR), which combines aluminum strands around a steel core. Other variants include all-aluminum conductors (AAC), all-aluminum alloy conductors (AAAC), aluminum conductor alloy-reinforced (ACAR), and aluminum-clad steel conductors. Advanced designs, such as aluminum conductors with steel...
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In signal processing, bandpass sampling is an effective technique for sampling signals that have most of their energy concentrated within a narrow frequency band. This type of signal is known as a bandpass signal. The key principle of bandpass sampling involves sampling the signal at a rate that is greater than twice the signal's bandwidth to prevent aliasing.
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相关实验视频

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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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基于空间的物联网的混合多访问方法:基于用户分布的自适应带宽分配和束布局.

Qingquan Liu1, Lihu Chen1, Songting Li1

  • 1College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China.

Sensors (Basel, Switzerland)
|September 28, 2024
PubMed
概括

一种新的多维混合多重访问方法 (MHSTFC-UD) 通过根据用户分布动态分配资源来增强卫星物联网 (IoT) 能力. 与传统方法相比,这种方法显著提高了用户的访问能力.

关键词:
梁的布局 梁的布局多重访问多重访问基于太空的物联网物联网.用户容量的用户容量.用户分发用户分发

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科学领域:

  • 卫星通信 卫星通信
  • 物联网 (IoT) 的物联网 (IoT) 的物联网.
  • 无线网络无线网络.

背景情况:

  • 基于空间的物联网开发面临由于频率资源稀缺和频谱利用效率低下的局限性.
  • 大规模的用户访问要求压力目前在有限频率条件下运行的卫星通信系统.

研究的目的:

  • 引入一种基于用户分布 (MHSTFC-UD) 的空间-时间-频率-代码划分的新型多维混合多重访问方法.
  • 解决空间物联网网络中频率资源不足和频谱利用率低的挑战.
  • 提高卫星物联网系统的容量和用户访问.

主要方法:

  • 将卫星光束单元划分为中心区域和边缘区域,根据用户分布动态调整中心区域的半径和频率资源分配.
  • 使用遗传算法建立和解决中央区域半径和频率资源分配的优化模型.
  • 利用边缘区域作为保护区间,在光束电池之间的时间,空间和代码域之间进行全频复杂化.

主要成果:

  • 与传统的2D/3D频率重复使用相比,MHSTFC-UD方法将最大单个卫星用户访问能力提高1到3个数量级.
  • 与固定区域划分和资源分配相比,MHSTFC-UD增加了用户容量额外的11.5%,达到33.1%.

结论:

  • 拟议的MHSTFC-UD是改善卫星物联网频谱利用和用户访问的有效策略.
  • 基于用户分布的动态资源配置为未来的基于空间的通信网络提供了相对于静态方法的显著优势.