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相关概念视频

Downsampling01:20

Downsampling

167
When considering a sampled sequence with zero values between sampling instants, one can replace it by taking every N-th value of the sequence. At these integer multiples of N, the original and sampled sequences coincide. This process, known as decimation, involves extracting every N-th sample from a sequence, thereby creating a more efficient sequence.
The Fourier transform of the decimated sequence reveals a combination of scaled and shifted versions of the original spectrum. This...
167
Maximum Power Transfer01:16

Maximum Power Transfer

265
Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
By substituting the entire circuit with...
265
Energy and Power Signals01:17

Energy and Power Signals

309
In an electrical system with a resistor, voltage and current signals facilitate the measurement of power and energy across the resistor. For a continuous-time signal, the total energy over a time interval is defined as the integral of the square of the signal's magnitude over that interval. Mathematically, this is expressed as:
309
Upsampling01:22

Upsampling

242
Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...
242
Energy Stored In A Coaxial Cable01:31

Energy Stored In A Coaxial Cable

1.5K
A coaxial cable consists of a central copper conductor used for transmitting signals, followed by an insulator shield, a metallic braided mesh that prevents signal interference, and a plastic layer that encases the entire assembly.
In the simplest form, a coaxial cable can be represented by two long hollow concentric cylinders in which the current flows in opposite directions. The magnetic field inside and outside the coaxial cable is determined by using Ampère's law. The magnetic...
1.5K
Sampling Continuous Time Signal01:11

Sampling Continuous Time Signal

269
In signal processing, a continuous-time signal can be sampled using an impulse-train sampling technique, followed by the zero-order hold method. Impulse-train sampling involves the use of a periodic impulse train, which consists of a series of delta functions spaced at regular intervals determined by the sampling period. When a continuous-time signal is multiplied by this impulse train, it generates impulses with amplitudes corresponding to the signal's values at the sampling points.
In the...
269

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相关实验视频

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基于单位定量化三角形-西格玛调制的自动编码器,用于高功率的自由空间通信.

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    此摘要是机器生成的。

    一个新型的1位自动编码器与三角形-西格玛调制 (基于DSM的AE) 改进了信号传输,特别是在噪音条件下. 这项技术提高了数据速率,并减少了未来移动网络的功耗.

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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
    • 信息理论 信息理论

    背景情况:

    • 高效的数据编码和解码对于高性能通信系统至关重要.
    • 现有的方法在杂的环境和高功耗中面临挑战.
    • 移动前线运输链路需要强大而节能的解决方案.

    研究的目的:

    • 为高效的信号处理引入一种基于三角信号模拟 (DSM) 的新型1位自动编码器 (AE).
    • 评估基于DSM的AE在各种通道条件下的性能,特别是低信号噪声比 (SNR).
    • 为了证明这种方法对未来移动前线运输应用的潜力.

    主要方法:

    • 开发一个1位自动编码器 (AE) 集成与三角形-西格玛调制 (DSM).
    • 模拟分析以评估降低噪声,降低峰值与平均功率比率 (PAPR) 以及在带内信号功率的增强.
    • 使用40米自由空间光学链路进行实验验证.

    主要成果:

    • 基于DSM的AE在SNR低于6dB时实现了理论传输性能.
    • 在自由空间实验中,与64QAM-DSM相比,比特错误率 (BER) 显著降低8.4dB.
    • 实现了1.31 Gbps的传输速率,并提高了信号质量.

    结论:

    • 一位AE-DSM有效地减轻噪声和非线性效应,改善信号完整性.
    • 它在接收模拟到数字转换器 (ADC) 中可节省大量电力.
    • 基于DSM的AE为增强未来移动前线运输链路提供了一个有希望的解决方案.