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相关概念视频

Design Example01:23

Design Example

375
The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
375
Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

980
In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
980
Bewley Lattice Diagram01:12

Bewley Lattice Diagram

877
The Bewley lattice diagram, developed by L. V. Bewley, effectively organizes the reflections occurring during transmission-line transients. It visually represents how voltage waves propagate and reflect within a transmission line, making it easier to understand the complex interactions that occur.
877
LC Circuits01:21

LC Circuits

2.7K
An LC circuit consists of an inductor and a capacitor, either in series or parallel. Consider a charged capacitor connected with an inductor in series. Before the switch is closed, all the energy of the circuit is stored in the electric field of the capacitor. When the switch is closed, the capacitor begins to discharge, producing a current in the circuit. The current, in turn, creates a magnetic field in the inductor. Because of the induced emf in the inductor, the current cannot change...
2.7K
Design Example: Underdamped Parallel RLC Circuit01:17

Design Example: Underdamped Parallel RLC Circuit

383
Consider designing an oscillator circuit, a crucial component in various electronic devices and systems. The objective is to create an oscillator circuit with specific characteristics: a damped natural frequency of 4 kHz and a damping factor of 4 radians per second. To accomplish this, a parallel RLC circuit is employed, known for its ability to sustain oscillations at a resonant frequency. In this case, the damping factor is pivotal in achieving the desired performance.
Starting with a fixed...
383
Transmission Line Design Considerations01:23

Transmission Line Design Considerations

221
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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相关实验视频

Updated: Sep 18, 2025

Quasi-light Storage for Optical Data Packets
07:45

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

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基于LDPC的多层编码调制的分层HARQ设计.

Yuejun Wei1, Yue Chen1, Chunqi Chen2

  • 1School of Computer and Information Engineering, Shanghai Polytechnic University, Shanghai 201209, China.

Entropy (Basel, Switzerland)
|June 26, 2025
PubMed
概括

这项研究将混合自动重复请求 (HARQ) 与多级编码调制 (MLCM) 集成. 为MLCM层量身定制的HARQ策略显著提高了再传输效率和数据传输性能.

关键词:
比特重新排列比特重新排列追赶 理 追赶 理混合自动重复请求请求.增加的冗余裁员.低密度平价检查的平价检查多级编码调制的多级编码调制.

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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

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相关实验视频

Last Updated: Sep 18, 2025

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07:45

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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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科学领域:

  • 无线通信是一种无线通信.
  • 信息理论是信息理论.
  • 数字信号处理是数字信号处理.

背景情况:

  • 多级编码调制 (MLCM) 通过优化对高概率错误位的错误纠正来改善数据传输.
  • 传统的比特交叉编码调制 (BICM) 系统具有MLCM可以克服的局限性.
  • 混合自动重复请求 (HARQ) 通过结合前置错误纠正 (FEC) 和自动重复请求 (ARQ) 来提高系统可靠性.

研究的目的:

  • 在MLCM框架内探索HARQ技术尚未探索的整合.
  • 为MLCM的分层结构专门调整HARQ策略.
  • 为了提高MLCM系统中的再传输效率和整体数据传输性能.

主要方法:

  • 开发了适应MLCM的HARQ技术.
  • 为每个MLCM层设计了量身定制的混合再传输策略.
  • 评估了集成的MLCM-HARQ系统的性能增长.

主要成果:

  • 在再传输效率方面取得了显著的收益.
  • 与现有系统相比,总体传输性能显著改善.
  • 在MLCM中验证了层特定HARQ策略的有效性.

结论:

  • 哈克与MLCM的集成为无线数据传输提供了显著的优势.
  • 层特定的HARQ策略对于优化MLCM性能至关重要.
  • 这项研究弥合了文献上的差距,为更强大的通信系统铺平了道路.