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Bipolar Junction Transistors (BJTs) are essential elements in electronic circuits, playing a crucial role in the functionality of amplifiers, memories, and microprocessors. These transistors can be designed as NPN or PNP based on their doping patterns. They consist of three layers: the emitter, base, and collector. The configuration of these layers and their respective doping levels—with N-type or P-type impurities—define the transistor's type and its operational...
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相关实验视频

Updated: Jul 15, 2025

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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一个基于双极互补脉冲宽度调制的自由空间光通信系统.

Jinji Zheng1, Xicai Li1, Qinqin Wu2

  • 1School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China.

Sensors (Basel, Switzerland)
|September 28, 2023
PubMed
概括
此摘要是机器生成的。

一个新的双极互补脉冲宽度调制策略通过改善比特同步和减少噪声来增强光学通信. 这种方法实现了较低的错误率,使5.6公里以上的语音和文本传输能够稳定.

关键词:
双极互补的脉冲宽度调制.自由空间光学通信自由空间光学通信调制和解调的调制和解调.多带宽的光谱减法.

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科学领域:

  • 光学通信是指光学通信.
  • 信号处理 信号处理
  • 调制技术 调制技术

背景情况:

  • 保持比特同步对于光学系统中可靠的数据传输至关重要.
  • 不同信号提供优势,如减少背景辐射和不需要通道状态信息.
  • 降低噪音对于提高光通信系统性能至关重要.

研究的目的:

  • 为光通信引入一种新的双极互补脉冲宽度调制策略.
  • 详细介绍模块化-解模块化方法,以实现增强的比特同步.
  • 提出一种降噪技术,以提高信号质量.

主要方法:

  • 开发了一种基于差异信号的双极互补脉冲宽度调制策略.
  • 调制和调制解调技术详细说明,以确保符号开始/结束时间的识别.
  • 基于接收的信号特征,应用了一种多带宽频谱降噪方法.

主要成果:

  • 拟议的策略有效地保持了发射器和接收器之间的比特同步.
  • 该系统在7dB的信号噪声比率下显示出10^-5的误差位率.
  • 一个制造的光通信系统成功地传输了5.6公里的语音和文本数据.

结论:

  • 双极互补脉冲宽度调制策略提供了强大的比特同步和降噪.
  • 这个系统中的差分信号将通道状态信息要求和背景辐射最小化.
  • 开发的光通信系统能够稳定,长距离的数据传输.