FSO Interleaving Length Shaping for Burst Error Mitigation
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Solution Overview
Problem
Conventional optical fiber communication techniques do not achieve high performance in free-space optical communication due to differences in transmission path characteristics, leading to increased data error rates and compatibility issues, which complicates system development and deployment.
Innovation Solution
A communication device with an interleaving unit that determines and adjusts the interleaving length of transmit data based on the specific free-space optical communication path, allowing the interleaving length to be detectable on the receiving side, and includes a shaping unit to optimize data format for error correction and compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If optical fiber communication techniques are applied to free-space optical communication, then communication infrastructure can be reused, but communication performance deteriorates due to differences in transmission path characteristics
Solution Approach 1:
The patent changes the interleaving length parameter based on transmission path characteristics. For ground-to-satellite communication with long fades, a longer interleving length is used, while for satellite-to-satellite communication with short fades, a shorter interleaving length is applied. This parameter adaptation resolves the contradiction by optimizing communication performance for each transmission type while maintaining the same underlying communication infrastructure.
2Device complexity
If a fixed interleaving length is used in free-space optical communication, then system complexity is reduced, but communication performance deteriorates due to varying transmission path characteristics
Solution Approach 1:
The patent implements a dynamic interleving length determination mechanism where the interleving length is selected based on the detected transmission path type. The system includes a transmission path determination unit that identifies whether the path is ground-to-satellite, satellite-to-satellite, or other types, and accordingly selects the appropriate interleving length. This dynamic adaptation improves error correction performance without significantly increasing system complexity.
3Reliability
If interleaving length is adapted to transmission path characteristics, then error correction performance is improved, but system complexity increases due to additional determination and control mechanisms
Solution Approach 1:
The patent performs preliminary determination of the transmission path characteristics before data transmission begins. The transmission path determination unit identifies the communication type (ground-to-satellite, satellite-to-satellite, etc.) in advance, and the interleving length is pre-selected based on this determination. This preliminary action allows the system to use simple lookup-based interleving length selection rather than complex real-time adaptation, improving error correction performance while minimizing added system complexity.
Data Source
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AI summary
A communication device includes an interleaving unit that determines an interleaving length of transmit data to be transmitted through free-space optical communication, and interleaves the transmit data based on the determined interleaving length, and a shaping unit that shapes the interleaved transmit data so as to make the interleaving length detectable on a receiving side of the free-space optical communication.