Underwater Optical Link Time Diversity Against Solar Noise
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Solution Overview
Problem
Optical communication systems underwater face challenges due to solar noise caused by caustics, which are lattice patterns of concentrated sunlight that generate instantaneous large noise, making it difficult to perform appropriate communication.
Innovation Solution
Implementing time diversity in optical communication systems by repeatedly transmitting identical optical signals at predetermined intervals, allowing the system to avoid solar noise peaks and reduce their influence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If optical communication is performed underwater using light, then wireless communication capability is achieved, but solar noise caused by caustics generates instantaneous large noise that degrades communication quality
Solution Approach 1:
The patent applies time diversity by periodically transmitting the same optical signal at predetermined time intervals. This periodic transmission allows the receiving end to combine multiple received signals, effectively averaging out the instantaneous solar noise caused by caustics and improving communication reliability underwater
2Reliability
If time diversity is applied by repeatedly transmitting identical optical signals at predetermined time intervals, then the influence of solar noise is reduced, but transmission time increases
Solution Approach 1:
The system transmits identical optical signals at predetermined time intervals, creating a periodic transmission pattern. This allows the receiver to collect multiple instances of the same information over time and combine them, achieving reliable communication while managing the time overhead through structured periodic transmission
3Reliability
If optical signal transmission is repeated at predetermined time intervals, then solar noise peaks are avoided and their influence is reduced, but communication protocol complexity increases
Solution Approach 1:
The patent implements a systematic periodic transmission approach where identical optical signals are sent at predetermined intervals. The communication protocol is designed to handle this periodic repetition, with the receiving end equipped to identify and combine these repeated transmissions, managing the complexity through structured timing and signal processing
Solution Approach 2:
The system employs feedback mechanisms where the receiving end monitors the quality of received optical signals and can request retransmission or adjust transmission parameters. This feedback loop helps manage protocol complexity by dynamically adapting to channel conditions while maintaining the time diversity approach
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 approach enables effective communication by reducing the impact of solar noise caused by caustics, ensuring reliable optical communication underwater.
Implementation Method 1
performs optical communication, which is wireless communication using light, underwater
Implementation Method 2
performs the optical communication to which time diversity is applied in which optical signal transmission corresponding to identical transmission information is repeatedly performed at a predetermined time interval
Data Source
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AI summary
An optical communication system is an optical communication system for performing optical communication, which is wireless communication using light, underwater, the optical communication system including a base station apparatus configured to form a cell underwater, and a terminal apparatus configured to perform the optical communication with the base station apparatus in the cell. At least one of the base station apparatus or the terminal apparatus performs the optical communication to which time diversity is applied in which optical signal transmission corresponding to identical transmission information is repeatedly performed at a predetermined time interval.