Underwater Transmitter Parameter Adjustment for Reliable Acoustic Communication
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Solution Overview
Problem
Underwater communication devices face challenges in ensuring high probability of correct message reception due to variable transmission medium effects, such as noise and reflections, which affect transmission power and frequency bandwidth, leading to decoding issues.
Innovation Solution
A method to dynamically set transmission parameters like power and frequency bandwidth by simulating the human speech adjustment principle, where the transmitter adjusts parameters based on immediate feedback from the medium without receiver feedback, optimizing power and frequency to enhance decoding reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission power is increased to ensure message reception, then reception reliability is improved, but distortion and reflections increase leading to reduced communication endurance
Solution Approach 1:
The patent implements dynamic adjustment of transmission parameters including power, frequency bandwidth, and modulation scheme based on real-time channel conditions. The system continuously monitors reception quality and adapts parameters to maintain optimal communication, resolving the contradiction between maintaining high power for reliability and reducing power to minimize distortion and reflections.
Solution Approach 2:
The system changes multiple transmission parameters simultaneously including transmission power level, frequency bandwidth allocation, and modulation complexity based on channel conditions. This multi-parameter adaptation allows the system to optimize the balance between reception reliability and harmful reflections by selecting appropriate parameter combinations for different operational scenarios.
2Object-generated harmful factors
If transmission power is decreased to reduce distortion, then harmful reflections are reduced, but message reception reliability deteriorates
Solution Approach 1:
The system dynamically adjusts transmission power based on real-time channel quality assessment. When channel conditions are good, power is reduced to minimize reflections; when conditions deteriorate, power is increased to maintain reception reliability. This dynamic adaptation resolves the contradiction by making power level contingent on actual communication needs.
Solution Approach 2:
The system employs feedback mechanisms where the transmitting device monitors reception quality through acknowledgments and channel state information from the receiving device. This feedback enables the transmitter to adjust power levels appropriately, ensuring reliability is maintained while minimizing harmful reflections when possible.
3Productivity
If frequency bandwidth is expanded to increase data rate, then communication productivity is improved, but susceptibility to ambient noise increases
Solution Approach 1:
The system dynamically adjusts frequency bandwidth allocation based on spectral analysis of ambient noise conditions. When noise levels are low across the spectrum, wider bandwidth is allocated to increase data rate. When noise is present in certain frequency ranges, the system narrows bandwidth or shifts frequency allocation to avoid noisy regions, thus resolving the contradiction between data rate and noise susceptibility.
Solution Approach 2:
The system applies local quality optimization by selectively allocating bandwidth in frequency regions with favorable signal-to-noise ratios. Instead of uniformly using the entire available spectrum, the system identifies and utilizes specific frequency sub-bands with lower noise interference, allowing high data rates in clean regions while avoiding noisy regions.
4Object-affected harmful factors
If frequency bandwidth is narrowed to avoid noise, then ambient noise interference is reduced, but communication productivity decreases
Solution Approach 1:
The system continuously monitors ambient noise spectrum and dynamically adjusts bandwidth allocation in real-time. When noise conditions improve, bandwidth is expanded to restore data rate; when noise persists, narrower bandwidth is maintained. This dynamic response resolves the contradiction by making bandwidth a variable that adapts to environmental conditions rather than a fixed parameter.
Solution Approach 2:
The system changes multiple parameters including bandwidth width, center frequency, and modulation order in response to noise conditions. By coordinating these parameter changes, the system maximizes data rate within the constraints imposed by ambient noise, resolving the contradiction through multi-parameter optimization rather than simple bandwidth adjustment.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method ensures reliable message reception by iteratively adjusting transmission parameters to minimize interference and optimize data rate, reducing echo and noise impact, thereby improving communication robustness and accuracy.
Implementation Method 1
a transmitting transducer for radiating the message as an acoustic wave
Implementation Method 2
a receiving hydrophone for receiving the acoustic wave and for converting the acoustic wave into an electrical signal
Implementation Method 3
The message is modulated in the modulator, receiving a time signal. Before transmission, the message is electrically sent back to the modulator via a demodulator and evaluated.
Data Source
Figure 1
AI summary
The invention relates to a novel method for operating a transmitter of an underwater communication device. The method is to be designed such that a transmitted message can be received correctly by another underwater communication device with a high degree of probability. In the novel method, at least one transmission parameter of a transmitter (1) of an underwater communication device is set as follows: - a transmission message is combined with a transmission test value in a computer (10), - the transmission message is modulated in a modulator (20), thereby obtaining a signal, - the signal is emitted using a transmission converter (24), - the emitted signal is modified by the transmission medium, - the modified signal is received by a receiving hydrophone (34), - the modified signal is demodulated in a demodulator (30), thereby obtaining a demodulated message, - a demodulated test value is ascertained from the demodulated message in the computer (10), said test value being compared with the transmission test value, and - if the demodulated test value does not match the transmission test value or if the demodulated message does not match the transmission message, the at least one transmission parameter is modified with respect to robustness, and the transmission message is emitted again with a modified transmission parameter or modified transmission parameters.