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Related Concept Videos

Sound Waves: Interference00:53

Sound Waves: Interference

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...
Interference and Superposition of Waves01:07

Interference and Superposition of Waves

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,...
Interference: Path Lengths01:10

Interference: Path Lengths

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...
Interference and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
Uniform Depth Channel Flow: Problem Solving01:18

Uniform Depth Channel Flow: Problem Solving

To calculate the flow rate for a trapezoidal channel, first, identify the bottom width, side slope, and flow depth of the channel. The cross-sectional area (A) corresponding to the depth of flow (y), channel bottom width (B), and side slope (θ) is determined by:Next, calculate the wetted perimeter, which includes the bottom width and the sloped side lengths in contact with the water. Using the values of the cross-sectional area and the wetted perimeter, determine the hydraulic radius by...
Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

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,...

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Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements
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Interference suppression for code-division multiple-access communications in an underwater acoustic channel.

T C Yang1, Wen-Bin Yang

  • 1Naval Research Laboratory, Code 7120, Washington, DC 20375, USA. yang@wave.nrl.navy.mil

The Journal of the Acoustical Society of America
|July 17, 2009
PubMed
Summary

This study introduces hyperspace cancellation to suppress interference in underwater acoustic networks, effectively addressing the near-far problem. The novel algorithm achieves low bit error rates even with significant signal interference.

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Area of Science:

  • Underwater Acoustic Communications
  • Signal Processing
  • Information Theory

Background:

  • Code-division multiple-access (CDMA) networks face the near-far problem, where strong nearby user signals interfere with distant ones.
  • Traditional power control and code orthogonality methods are ineffective in underwater acoustic channels due to slow sound speed and multipath interference.
  • Existing signal processing techniques struggle with synchronized signal arrival times and multipath-induced code orthogonality destruction.

Purpose of the Study:

  • To develop and evaluate a novel algorithm for suppressing strong interference in underwater acoustic CDMA systems.
  • To address the limitations of conventional interference rejection techniques in challenging underwater environments.
  • To demonstrate the effectiveness of the proposed method in achieving reliable data transmission despite high interference levels.

Main Methods:

  • Implementation of the hyperspace cancellation by coordinate zeroing algorithm.
  • Utilizing the Fast Walsh-Hadamard Transform (FWHT) to enhance and zero out interference based on the interferer's code sequence.
  • Employing inverse FWHT for signal reconstruction and subsequent processing with desired signal code sequences using established direct-sequence spread-spectrum methods.

Main Results:

  • The hyperspace cancellation algorithm successfully removed/suppressed significant interference signals.
  • At-sea data demonstrated a low bit error rate (BER < 10^-2) under challenging signal-to-interference ratios (SIR) as low as -8 to -11 dB.
  • The method proved effective in extracting transmitted symbols even in the presence of severe near-far interference.

Conclusions:

  • Hyperspace cancellation by coordinate zeroing is a viable and effective technique for mitigating interference in underwater acoustic CDMA systems.
  • The algorithm overcomes the limitations of traditional methods in environments with multipath propagation and unsynchronized users.
  • This approach significantly improves the reliability of underwater communication systems, enabling robust data transmission in noisy conditions.