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相关概念视频

Downsampling01:20

Downsampling

144
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...
144
Discrete-Time Fourier Series01:20

Discrete-Time Fourier Series

241
The Discrete-Time Fourier Series (DTFS) is a fundamental concept in signal processing, serving as the discrete-time counterpart to the continuous-time Fourier series. It allows for the representation and analysis of discrete-time periodic signals in terms of their frequency components. Unlike its continuous counterpart, which utilizes integrals, the calculation of DTFS expansion coefficients involves summations due to the discrete nature of the signal.
For a discrete-time periodic signal x[n]...
241
Design Example01:23

Design Example

321
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...
321
The Delta-to-Delta Circuit01:17

The Delta-to-Delta Circuit

570
In a delta-delta configuration, the source and the load are connected in a delta manner, forming a closed loop that divides the network into three distinct phases. This configuration makes the phase voltages identical to line voltages. Assuming the sources are in positive sequence, the phase voltages can be expressed directly without having a neutral wire.
570
The Y-to-Delta Circuit01:19

The Y-to-Delta Circuit

414
A balanced wye-to-delta circuit comprises balanced Y-connected voltage sources and delta-connected loads with no neutral line connection.
The initial step in analyzing a wye-to-delta circuit is to assume a positive phase sequence. These phase voltages are then utilized to calculate the line voltages that occur directly across the delta-connected load impedances. Van, Vbn, and Vcn are the phase voltages in wye, and Vab, Vbc, and Vca are the line voltages for a delta circuit. The relation between...
414
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

1.0K
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
1.0K

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Updated: Jun 16, 2025

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基于diff-delta-sigma调制和OCT预编码的数字移动前航线方案.

Xiongwei Yang, Jianjun Yu, Jianyu Long

    Optics letters
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    PubMed
    概括
    此摘要是机器生成的。

    这项研究介绍了用于65536-QAM信号的数字移动前程 (MFH) 解决方案,使用不同-三角形-信号调制 (D-DSM) 和直角循环矩阵转换 (OCT) 预编码. 功率叠加方案为未来的6G网络提供了高效的性能.

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    相关实验视频

    Last Updated: Jun 16, 2025

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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
    • 无线网络 无线网络 无线网络

    背景情况:

    • 数字移动前线 (MFH) 对于高容量无线系统至关重要.
    • 65536-方格振幅调制 (65536-QAM) 信号由于带宽和噪声要求,给MFH带来了重大挑战.
    • 现有的MFH方案在量子化噪声分布和复杂性方面扎.

    研究的目的:

    • 为了实验证明一个新的数字MFH系统65536-QAM信号.
    • 解决MFH系统中带内量子化噪声 (IBN) 不均分布的问题.
    • 评估不同的信号组合方案,以提高效率和性能.

    主要方法:

    • 实现使用不同-delta-sigma调制 (D-DSM) 方案的数字MFH系统.
    • 整合直角循环矩阵转换 (OCT) 预编码与D-DSM方案.
    • 在D-DSM框架内比较灰色编码和功率叠加信号组合方案.

    主要成果:

    • 对65536-QAM信号进行数字MFH的成功演示.
    • 通过将D-DSM与OCT预编码相结合,实现了大约1.5dB的量子化信号噪声比 (SNR) 增益.
    • 与灰色编码相比,确定了功率叠加作为具有较低计算复杂度和较低和效应影响的方案.

    结论:

    • 与OCT预编码相结合的D-DSM方案有效地管理了带内量子化噪声.
    • 功率叠加方案为D-DSM MFH中信号组合提供了一个实用和高效的替代方案.
    • 这种D-DSM解决方案结合了OCT预编码和功率叠加,为未来的6G数字移动前程系统提供了可行的方法.