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Related Concept Videos

Aliasing01:18

Aliasing

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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...
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Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
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Parallel Resonance01:23

Parallel Resonance

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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:
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Bandpass Sampling01:17

Bandpass Sampling

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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....
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2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

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Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...
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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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Updated: Jun 3, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Channel-Hopping Sequence and Searching Algorithm for Rendezvous of Spectrum Sensing.

Young-June Choi1, Young-Sik Kim2, Ji-Woong Jang3

  • 1Department of Software and Computer Engineering, Ajou University, Suwon 16499, Republic of Korea.

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

This study introduces a p-ary m-sequence for cognitive radio channel searching, significantly improving rendezvous efficiency over existing methods. The new scheme offers up to four times better performance, especially with limited common channels.

Keywords:
asymmetric channel modelblind rendezvouscognitive radio networks (CRNs)fast randezvous modessequencespectrum sensing

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Area of Science:

  • Cognitive Radio
  • Wireless Communication
  • Signal Processing

Background:

  • Cognitive radio networks require efficient channel searching for device rendezvous.
  • Asymmetric channel models present unique challenges for establishing communication.
  • Existing channel searching algorithms, like the jump-stay (JS) algorithm, have performance limitations.

Purpose of the Study:

  • To propose and analyze a novel channel-searching pattern using p-ary m-sequences for cognitive radio rendezvous.
  • To introduce a new channel-searching scheme optimized for m-sequence utilization.
  • To mathematically derive and simulate the performance of the proposed scheme.

Main Methods:

  • Application of p-ary m-sequence as a channel-searching pattern.
  • Mathematical analysis and calculation of the effective time-to-rendezvous (ETTR).
  • Development of a new channel-searching scheme and adaptation of m-sequence generation.
  • Comparative simulations against the conventional scheme and the JS algorithm.

Main Results:

  • The m-sequence applied to the conventional scheme shows significantly better ETTR than the JS algorithm.
  • The newly proposed scheme with m-sequence outperforms the conventional scheme with m-sequence.
  • A notable four-fold improvement in ETTR was achieved with the new scheme in a single common channel scenario.

Conclusions:

  • The proposed p-ary m-sequence based channel-searching method enhances cognitive radio rendezvous efficiency.
  • The novel channel-searching scheme maximizes the benefits of m-sequences for improved performance.
  • This approach offers a substantial advancement in cognitive radio communication setup, particularly in challenging channel conditions.