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相关概念视频

Design Example01:23

Design Example

316
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...
316
Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

76
Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
76
Properties of Fourier Transform II01:24

Properties of Fourier Transform II

167
The Fourier Transform (FT) is an essential mathematical tool in signal processing, transforming a time-domain signal into its frequency-domain representation. This transformation elucidates the relationship between time and frequency domains through several properties, each revealing unique aspects of signal behavior.
The Frequency Shifting property of Fourier Transforms highlights that a shift in the frequency domain corresponds to a phase shift in the time domain. Mathematically, if x(t) has...
167
Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

85
Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
85
Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

692
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.
692
Phasor Arithmetics01:13

Phasor Arithmetics

242
Phasors and their corresponding sinusoids are interrelated, offering unique insights into the behavior of alternating current (AC) circuits. One way to understand this relationship is through the operations of differentiation and integration in both the time and phasor domains.
When the derivative of a sinusoid is taken in the time domain, it transforms into its corresponding phasor multiplied by j-omega (jω) in the phasor domain, where j is the imaginary unit, and ω is the angular...
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相关实验视频

Updated: Jun 3, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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设计和实施二进制相位移键化频率多元数组:考虑和挑战

Nicholas R Munson1, Bill Correll2, Justin K A Henry1

  • 1Department of Electrical Engineering, The Pennsylvania State University, University Park, PA 16802, USA.

Sensors (Basel, Switzerland)
|January 11, 2025
PubMed
概括

频率多变阵列 (FDA) 增强光束成型,以确保安全的定向通信. 这项研究详细介绍了设计具有快速二进制相位移键化 (BPSK) 调制的两要素FDA,显示实验数据匹配模拟.

关键词:
全面软件无线电周边设备 (USRP)二进制相位转移键化 (BPSK)频率多样化的阵列 (FDA)物理层的安全性是物理层的安全性.安全的定向通信 (SDC)

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科学领域:

  • 电气工程 电气工程
  • 信号处理 信号处理
  • 通信工程 通信工程

背景情况:

  • 传统的分相阵列 (PA) 提供只有角度的光束成形.
  • 不同频率阵列 (FDA) 能够在范围和角度上进行光束成型.
  • 使用FDA的定向调制 (DM) 增强了安全的定向通信 (SDC).

研究的目的:

  • 为了记录设计和实施两个元素线性FDA的挑战.
  • 在FDA系统中调查快速二进制相位移键化 (BPSK) 调制的使用.
  • 用实验现场数据验证分析模型.

主要方法:

  • 开发一个两元线性频率多元阵列 (FDA) 架构.
  • 快速二进制相位移密钥化 (BPSK) 调制方案的实施.
  • 对FDA系统的分析建模和模拟.
  • 收集实验数据并与模拟结果进行比较.

主要成果:

  • 成功设计和实施了两元线性FDA系统.
  • 通过使用FDA与DM证明了在范围和角度上的比特错误率 (BER) 的降低.
  • 通过与实验现场数据密切一致的分析模型的验证.
  • 与DM一起的FDA显示,与SDC相比,传统PA的性能有所改善.

结论:

  • 频率多元阵列 (FDA) 架构,特别是与定向调制 (DM) 结合使用时,为安全的定向通信 (SDC) 提供了相对于传统相位阵列 (PA) 的显著优势.
  • 该研究成功地解决了使用快速时间BPSK调制的双元线性FDA的设计和实施挑战.
  • 实验验证证证实了开发的分析模型的准确性,为基于FDA的实际SDC系统铺平了道路.