Enhancing deep-sea communication via time-reversal equalization in reliable acoustic path channels
Contact us if these videos are not relevant.
Contact us if these videos are not relevant.
View abstract on PubMed
Summary
This summary is machine-generated.Deep-sea acoustic networks face multipath challenges. A novel equalizer improves reliability by adapting to the reliable acoustic path (RAP) channel, reducing interference for better communication.
Area Of Science
- Oceanography
- Acoustic communication
- Signal processing
Background
- Reliable acoustic path (RAP) channels enable long-range underwater communication.
- Deep-sea environments suffer from strong multipath interference, degrading signal quality.
- Scattering at interface inhomogeneities creates reverberation tails in acoustic signals.
Purpose Of The Study
- To develop and evaluate a method for mitigating multipath interference in deep-sea acoustic communication over RAP channels.
- To improve the reliability and throughput of underwater acoustic networks.
Main Methods
- Measurements in the South China Sea to characterize RAP channel structures.
- Development of a RAP-adaptive time-reversal equalizer using physics-guided statistical fitting.
- Modeling the channel impulse response as a superposition of multipaths and reverberation.
- Performance evaluation using frequency-hopping spread spectrum M-ary frequency-shift keying and direct-sequence spread spectrum M-ary phase-shift keying.
- Network-level throughput analysis.
Main Results
- Stable arrival structures and distinct multipath branches were observed across different source depths.
- The RAP-adaptive time-reversal equalizer effectively suppressed multipath interference.
- Reduced inter-symbol interference was demonstrated through experimental validation.
- Improved link reliability was achieved in deep-sea acoustic communication experiments.
Conclusions
- The RAP-adaptive time-reversal equalizer is a practical physical-layer solution for enhancing deep-sea acoustic networks.
- This method offers a viable approach to overcome multipath limitations in underwater acoustic communication.
- The findings contribute to the advancement of robust long-range underwater communication systems.
Contact us if these videos are not relevant.
Contact us if these videos are not relevant.
Related Concept Videos
Consider the gas molecules in a cylinder. They move in a random motion as they collide with each other and change speed and direction. The average of all the path lengths between collisions is known as the "mean free path."
The mean free path varies inversely with the density of the molecules because when there are more molecules inside a volume, they have a greater chance of colliding with each other, thus reducing the mean free path. Additionally, the mean free path is inversely related to...
Non-verbal communication plays a critical role in human interaction, influencing how individuals perceive emotions and psychological states. It operates through four primary channels: facial expressions, eye contact, body language, and touch. These non-verbal cues help convey meaning beyond spoken language and are often culturally influenced.Facial Expressions and Emotional RecognitionFacial expressions are among the most powerful and universal forms of non-verbal communication. Research has...
Communication between two animals occurs when one animal transmits an information signal that causes a change in the animal that receives the information. Organisms communicate with one another in a host of different ways. Signals can be auditory, chemical, visual, tactile, or a combination of these. Communication is a critical behavioral adaptation that promotes survival, growth, and reproduction.
Types of Communication
A common form of communication is visual. Visual communication can be...
Reliability and validity are two important considerations that must be made with any type of data collection. Reliability refers to the ability to consistently produce a given result. In the context of psychological research, this would mean that any instruments or tools used to collect data do so in consistent, reproducible ways.
Unfortunately, being consistent in measurement does not necessarily mean that you have measured something correctly. To illustrate this concept, consider a kitchen...
Consider the two thermodynamic processes involving an ideal gas that are represented by paths AC and ABC in Figure 1:
In the first process for path A to C, the gas is kept at constant temperature T. It undergoes an expansion from volume V1 to V2.
The work done by an ideal gas is expressed as
Substituting for pressure as nRT/V from the ideal gas equation and integrating the terms, the work done by an ideal gas at constant temperature is obtained as
In the second process, for path A to B, the...
One-Way ANOVA can be performed on three or more samples with equal or unequal sample sizes. When one-way ANOVA is performed on two datasets with samples of equal sizes, it can be easily observed that the computed F statistic is highly sensitive to the sample mean.
Different sample means can result in different values for the variance estimate: variance between samples. This is because the variance between samples is calculated as the product of the sample size and the variance between the...