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相关概念视频

Linear Approximation in Frequency Domain01:26

Linear Approximation in Frequency Domain

412
Linear systems are characterized by two main properties: superposition and homogeneity. Superposition allows the response to multiple inputs to be the sum of the responses to each individual input. Homogeneity ensures that scaling an input by a scalar results in the response being scaled by the same scalar.
In contrast, nonlinear systems do not inherently possess these properties. However, for small deviations around an operating point, a nonlinear system can often be approximated as linear....
412
Aliasing01:18

Aliasing

731
Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original...
731
Reconstruction of Signal using Interpolation01:10

Reconstruction of Signal using Interpolation

811
Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next...
811
Frequency-Domain Interpretation of PD Control01:24

Frequency-Domain Interpretation of PD Control

404
Proportional-Derivative (PD) controllers are widely used in fan control systems to improve stability and performance. A fan control system can be effectively represented using a Bode plot to illustrate the impact of a PD controller through its transfer function. The Bode plot visually conveys how PD control modifies the fan's response across various frequencies, providing a frequency domain interpretation of the controller's behavior.
The proportional control gain, combined with the...
404
Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

432
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...
432
Bandpass Sampling01:17

Bandpass Sampling

599
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.
A bandpass signal has a spectrum with a lower frequency limit, denoted as ω1, and an upper frequency limit, denoted as ω2....
599

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相关实验视频

Updated: Mar 11, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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使用细粒度多层次分析合成过器银行道化的干扰感应频率敏捷的车载处理器.

Surajit Sarkar1,2, Amitabha Das3, Deepak Mishra4

  • 1Department of Power Engineering, Jadavpur University, Kolkata, 700106, India. surajits.pe.rs@jadavpuruniversity.in.

Scientific reports
|March 10, 2026
PubMed
概括

本研究介绍了用于卫星和深空数字信号处理的光谱优化的过器银行. 它大大减少了对细粒度道化的硬件和计算需求.

关键词:
分析合成过器银行以FPGA为导向的实施.多通道过器银行多层次的道化.多级信号处理多级信号处理.统一的过器银行

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相关实验视频

Last Updated: Mar 11, 2026

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科学领域:

  • 数字信号处理 数字信号处理
  • 过器银行设计
  • 航空航天通信 航空航天通信

背景情况:

  • 高效的数字信号处理对于深空和卫星任务至关重要.
  • 现有的道化方法通常会产生很高的计算和内存开销.
  • 需要光谱优化解决方案,降低硬件复杂度.

研究的目的:

  • 提出一个光谱优化,多通道过器银行通道器.
  • 为了实现精细的道化,减少内存和计算开销.
  • 为了证明卫星上和深空数字信号处理的可行性.

主要方法:

  • 开发了数字信号处理的统一框架.
  • 使用单个原型过器进行分析和合成,通过二极扩张和结构级联的子频段过器.
  • 采用多目标成本函数来优化原型过器在正方形相位移密钥 (QPSK) 恢复约束下.
  • 进行了基于区块的快速里埃变换 (FFT) 复杂性分析.

主要成果:

  • 实现了强大的频道隔离 (>98dB平均值,在64个频道中最坏情况下为79.6dB).
  • 维护的正方位相位移键 (QPSK) 错误矢量大小 (EVM) 在10%以下.
  • 通过固定点模拟和FPGA合成,在有限的词长限制下,证明了与通信相关的隔离 (>60 dB最坏的情况下).

结论:

  • 拟议的过器银行道化器提供了光谱优化的性能,降低了开销.
  • 它非常适合用于下一代卫星和深空任务中的内置数字处理器.
  • 该架构在实际约束下展示了现实的硬件可行性.