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相关概念视频

Upsampling01:22

Upsampling

238
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...
238
Parallel Resonance01:23

Parallel Resonance

210
The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
210
Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

778
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.
778
Characteristics of Series Resonant Circuit01:24

Characteristics of Series Resonant Circuit

258
Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
258
Design Example01:23

Design Example

330
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...
330
Properties of Fourier Transform I01:21

Properties of Fourier Transform I

176
The application of Fourier Transform properties in radio broadcasting is multifaceted, enabling significant advancements in the way signals are transmitted and received. Key areas where these properties are utilized include simultaneous multi-channel transmission, audio clip speed adjustments, live broadcast delays for different time zones, audio frequency adjustments, and signal demodulation.
In radio broadcasting, multiple audio signals often need to be transmitted simultaneously. The Fourier...
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相关实验视频

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Gain-compensation Methodology for a Sinusoidal Scan of a Galvanometer Mirror in Proportional-Integral-Differential Control Using Pre-emphasis Techniques
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基于MIMO的QAM-FBMC系统的性能提升和PAPR降低.

Emad S Hassan1,2

  • 1Department of Electrical Engineering, College of Engineering, Jazan University, Jizan, Saudi Arabia.

PloS one
|January 11, 2024
PubMed
概括

本研究引入了一种新的方法,用于降低具有多输入和多输出 (MIMO) 天线的过器银行多载波 (FBMC) 系统中的高峰到平均功率比 (PAPR). 该技术可以提高未来无线通信的系统性能和吞吐量.

科学领域:

  • 无线通信无线通信
  • 信号处理 信号处理

背景情况:

  • 过器银行多载波 (FBMC) 是未来通信系统的一种有前途的多载波调制 (MCM) 技术,它比直角频率分割多重复合 (OFDM) 具有优势.
  • FBMC系统,特别是当与多输入和多输出 (MIMO) 和正方体振幅调制 (QAM) 结合使用时,面临着高峰到平均功率比率 (PAPR) 的重大挑战,导致非线性功率放大器效率低下.
  • 高的PAPR需要增加输入回收 (IBO),降低功率效率和限制覆盖范围,特别是在使用光束成形来提高系统性能时.

研究的目的:

  • 分析基于MIMO的QAM-FBMC系统的性能,考虑到系统的复杂性和干扰.
  • 为基于MIMO的QAM-FBMC系统提出和评估一种新的PAPR降低方法,以提高效率和覆盖范围.
  • 与现有技术相比,证明拟议方法在提高PAPR和吞吐量方面的有效性.

主要方法:

  • 基于MIMO的QAM-FBMC系统的性能分析,评估复杂性和干扰.
  • 开发一种新的PAPR减少技术,利用MIMO通道的零空间使用剪切和过 (CF).
  • 将PAPR缩小信号映射到MIMO通道的零空间,用于每个频段,并使用非线性功率放大器模型进行模拟.

主要成果:

  • 拟议的剪切和过 (CF) 技术有效地减少了基于MIMO的QAM-FBMC系统中的PAPR.

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  • 该方法成功地将PAPR减小信号映射到MIMO通道的零空间中,减轻干扰.
  • 计算机模拟表明,与传统方法相比,PAPR和吞吐量都有显著的改进.

    • 结论:

    • 拟议的PAPR降低方法显著提高了基于MIMO的QAM-FBMC系统的性能.
    • 这种技术对于提高功率效率和扩展未来使用FBMC和MIMO的无线通信系统的覆盖范围至关重要.
    • 该方法为在先进的多载波调制方案中克服PAPR挑战提供了一个实际的解决方案.