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相关概念视频

Propagation Speed of Electromagnetic Waves01:30

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Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
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相关实验视频

Updated: Jun 6, 2025

Quasi-light Storage for Optical Data Packets
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在蓝色LED上利用光学OFDM调制VLC数据通讯器,无需对4米无线链路进行等级化.

Yuan-Zeng Lin1, Chien-Hung Yeh2,3, Wen-Piao Lin4

  • 1Department of Photonics, National Yang Ming Chiao Tung University, Hsinchu 300093, Taiwan.

Micromachines
|November 27, 2024
PubMed
概括

这项研究表明,使用单个蓝色发光二极管 (LED) 和直角频率分割复杂化方格振幅调制 (OFDM-QAM) 系统,可以实现超过1Gbit/s的可见光通信 (VLC) 流量容量. 这一突破使得即使在低光条件下也能够实现高速室内无线网络.

关键词:
在APD中,使用的是APD.其他OFDM-QAM.蓝色的LED是蓝色的LED.均等化 均等化 均等化可见光通信 (VLC) 是一种可见光通信.

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相关实验视频

Last Updated: Jun 6, 2025

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科学领域:

  • 光电学是指光电子产品.
  • 无线通信无线通信
  • 光学工程是指光学工程.

背景情况:

  • 可见光通信 (VLC) 系统通常使用宽带发光二极管 (LED) 和光谱效率调制来实现高流量容量.
  • 在VLC系统中实现高数据速率对于下一代室内无线网络至关重要.

研究的目的:

  • 展示一种可见光通信 (VLC) 系统,能够使用单个蓝色LED实现超过1Gbit/s的容量.
  • 评估在低照明条件下使用比特和功率加载算法对直角频率划分多重复合方格振幅调制 (OFDM-QAM) 系统的性能.

主要方法:

  • 在单个蓝色LED上应用直角频率划分复杂化正方形振幅调制 (OFDM-QAM) 的比特和功率加载算法.
  • 使用 400 MHz 带宽的雪崩光二极管 (APD) 基接收器 (Rx) 来解码光信号.
  • 在无线链路长度为1至4米的无线链路上测试系统的性能,照明水平在255至40 lux之间.

主要成果:

  • 使用单个蓝色LED和OFDM-QAM,实现了超过1Gbit/s (0.962至1.057Gbit/s) 的数据速率.
  • 在室内照明不佳的情况下,使用400MHz带宽APD接收器证明成功解码.
  • 证实了高灵敏度APD在补偿无线VLC链路长度方面的有效性.

结论:

  • 一个蓝色LED VLC系统可以实现高数据速率 (>1 Gbit/s),适用于室内接入网络.
  • 拟议的带有APD接收器的OFDM-QAM系统即使在没有模拟等级的低光环境中也有效.
  • 这项技术为增强室内无线通信能力提供了可行的解决方案.