Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Sound Waves: Interference00:53

Sound Waves: Interference

3.9K
Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
3.9K
Interference: Path Lengths01:10

Interference: Path Lengths

1.4K
Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
1.4K
Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

954
Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
954
Interference and Superposition of Waves01:07

Interference and Superposition of Waves

5.4K
When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
Interference occurs in mechanical waves, such as sound waves, waves on a string, and surface water waves. Mechanical waves correspond to the physical displacement of particles. Hence,...
5.4K
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

1.2K
The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
1.2K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Low-complexity iterative receiver based on variational Bayesian inference for multiple-input multiple-output underwater acoustic communication.

The Journal of the Acoustical Society of America·2026
Same author

Adaptive nulling array direction-of-arrival estimation based on adaptive kernel width mixture correntropy under impulsive noise.

The Journal of the Acoustical Society of America·2025
Same author

Robust symbol detection for single-carrier underwater acoustic communication in impulsive noise environment.

The Journal of the Acoustical Society of America·2024
Same author

Time domain turbo equalization based on vector approximate message passing for multiple-input multiple-output underwater acoustic communications.

The Journal of the Acoustical Society of America·2024
Same author

Wideband signal detection in multipath environment affected by impulsive noise.

The Journal of the Acoustical Society of America·2022
Same author

Iterative channel estimation-based soft successive interference cancellation for multiuser underwater acoustic communications.

The Journal of the Acoustical Society of America·2021
Same journal

Interaction of near-wall bubble arrays with acoustic waves induced by an oscillating rigid wall.

The Journal of the Acoustical Society of America·2026
Same journal

Ultra-broadband underwater acoustic projector based on transverse resonance orthogonal beam (TROB) mode and acoustic matching layer technique.

The Journal of the Acoustical Society of America·2026
Same journal

Fine-scale quantitative analysis of bowhead whale (Balaena mysticetus) song shows varying stability of song types.

The Journal of the Acoustical Society of America·2026
Same journal

High-resolution depth estimation for multiple wideband sources in deep sea via sparse Bayesian learninga).

The Journal of the Acoustical Society of America·2026
Same journal

Depression markers in speech: An approach based on tract variables dynamics.

The Journal of the Acoustical Society of America·2026
Same journal

The oyster toadfish (Opsanus tau) alters active and diurnal calling amid vessel noise in New York City.

The Journal of the Acoustical Society of America·2026
See all related articles

Related Experiment Video

Updated: Aug 23, 2025

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
09:43

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

10.0K

Blind beamforming-based strong interference suppression in underwater acoustic direct-sequence code-division

Wei Men1, Liang Zhang1, Jing-Wei Yin1

  • 1Acoustic Science and Technology Laboratory, Harbin Engineering University, Harbin 150001, China.

The Journal of the Acoustical Society of America
|November 1, 2022
PubMed
Summary
This summary is machine-generated.

A new blind beamformer method improves underwater acoustic communications by suppressing interference in direct-sequence code-division multiple-access systems. This technique enhances performance for distant users in challenging acoustic environments.

More Related Videos

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
08:39

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Published on: January 28, 2019

9.9K
Wideband Optical Detector of Ultrasound for Medical Imaging Applications
08:21

Wideband Optical Detector of Ultrasound for Medical Imaging Applications

Published on: May 11, 2014

11.3K

Related Experiment Videos

Last Updated: Aug 23, 2025

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
09:43

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

10.0K
Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
08:39

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Published on: January 28, 2019

9.9K
Wideband Optical Detector of Ultrasound for Medical Imaging Applications
08:21

Wideband Optical Detector of Ultrasound for Medical Imaging Applications

Published on: May 11, 2014

11.3K

Area of Science:

  • Underwater acoustics
  • Signal processing
  • Telecommunications

Background:

  • Direct-sequence code-division multiple-access (DS-CDMA) systems in underwater acoustics suffer from performance degradation due to strong multiple-access interference, particularly the near-far effect.
  • Conventional receivers struggle to mitigate severe interference, limiting communication reliability for distant users.

Purpose of the Study:

  • To propose a novel time-frequency-time with eigendecomposition-based blind beamformer (TFT-EBB) method.
  • To enhance the suppression of strong interference from nearby users for distant users in underwater acoustic DS-CDMA systems.
  • To improve the performance of receivers requiring less prior information.

Main Methods:

  • The TFT-EBB method utilizes eigendecomposition of the array covariance matrix at each frequency bin to estimate the composite steering vector of multipath components for weak desired signals.
  • An energy detection-based RAKE receiver is cascaded with the TFT-EBB to achieve multipath diversity.
  • The method is evaluated using simulated and field experimental data.

Main Results:

  • The proposed TFT-EBB method effectively suppresses strong interference from nearby users, even when interference levels are moderately higher than the desired signal.
  • The cascaded RAKE receiver achieves multipath diversity with reduced prior information requirements compared to conventional RAKE receivers.
  • Validation through both simulated and field experimental data confirms the method's effectiveness.

Conclusions:

  • The TFT-EBB method offers a robust solution for mitigating near-far effects and improving communication performance in underwater acoustic DS-CDMA systems.
  • The proposed approach enhances signal reception for distant users by effectively suppressing interference and leveraging multipath diversity.
  • This technique represents a significant advancement for reliable underwater acoustic communications.