Adaptive Interleaving in Free-Space Optical Communication

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

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, and result in higher development and introduction costs.

Innovation Solution

A communication system with an interleaving unit that determines and adjusts the interleaving length of transmit data for free-space optical communication, and a shaping unit that makes this length detectable on the receiving side, using a Reed-Solomon product code for error correction and synchronization codes to optimize data transmission.

Engineering Contradictions & Design Principles

VSEngineering 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

Engineering Contradiction:

Improvereusability of communication infrastructureVSAvoidcommunication performance

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent changes the interleaving length parameter dynamically to adapt to free-space optical communication characteristics. By adjusting this parameter, the system maintains compatibility with existing optical fiber infrastructure while optimizing performance for free-space transmission, resolving the contradiction between reusability and performance.

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If fixed interleaving length is used in optical fiber communication, then system complexity is reduced, but data error rate increases in free-space optical communication due to burst errors

Engineering Contradiction:

Improveinterleaving system complexityVSAvoiddata error rate

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent implements dynamic interleaving length adjustment, transforming the fixed interleaving system into an adaptive one. The interleaving length changes based on transmission conditions to effectively disperse burst errors in free-space optical communication, maintaining low system complexity while improving reliability.

Inventive Principle:

Principle #15Dynamics

3Reliability

If interleaving length is extended to correct burst errors, then data reliability is improved, but communication delay increases

Engineering Contradiction:

Improvedata error correction capabilityVSAvoidcommunication delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent dynamically adjusts interleaving length based on actual transmission conditions. When burst errors are detected, the interleaving length is extended to correct errors; when conditions are good, the length is reduced to minimize delay. This dynamic approach resolves the contradiction between error correction capability and communication delay.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS11522609B2Communication device, communication method, and communication program

Publication Date: 2022.12.06 SONY GROUP CORP

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.