Bit-Matrix Interleaving for Burst-Tolerant Optical FEC
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Solution Overview
Problem
Conventional forward error correction (FEC) codes struggle to accurately correct burst errors in high-speed optical transmission, leading to high bit error rates due to consecutive symbol errors in optical networks.
Innovation Solution
A communication method involving position transformation and mapping of bit data using global and local offset constraint factors to improve burst tolerance, implemented through encoding and decoding processes in transmit and receive end devices, enhancing the discreteness and evenness of bit data transformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional FEC codes are used for error correction in optical transmission, then the system structure is simple, but the burst error correction capability is poor leading to high bit error rates
Solution Approach 1:
The patent segments the bit sequence into multiple blocks and applies different interleaving strategies to different segments. The first interleaver processes bits within each block, while the second interleaver processes across blocks, creating a hierarchical segmentation approach that improves burst error correction without overwhelming system complexity
Solution Approach 2:
The patent introduces a two-dimensional interleaving structure where bits are arranged in blocks and subjected to interleaving in both intra-block and inter-block dimensions. This dimensional approach transforms the error correction problem from one-dimensional to two-dimensional, significantly improving burst error tolerance while maintaining manageable complexity through structured processing
2Reliability
If position transformation with global and local offset constraint factors is applied, then the burst tolerance capability is improved, but the processing complexity increases
Solution Approach 1:
The patent applies local offset constraint factors to specific blocks rather than uniformly to the entire bit sequence. This local quality approach allows different blocks to have tailored interleaving characteristics, improving burst tolerance for specific error patterns while reducing overall processing complexity by avoiding global complexity
Solution Approach 2:
The patent changes the parameters of position transformation by introducing global offset constraint factors and local offset constraint factors that control the interleaving pattern. These parameter changes enable flexible adjustment of the interleaving strength and pattern, improving burst tolerance while keeping processing complexity manageable through parameterized control
Data Source
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AI summary
This application provides a communication method and apparatus. The method includes: encoding a to-betransmitted first bit sequence to obtain a first matrix, where the first matrix includes a plurality of bit square matrices of a same size, and each bit square matrix includes a plurality of pieces of bit data; performing, based on a first mapping relationship, position transformation in a range of each bit square matrix on the bit data of each bit square matrix in the first matrix, to obtain a second matrix after the position transformation; and performing bit data position transformation among bit square matrices on the second matrix to obtain a third matrix, and modulating a to-be-sent first symbol sequence based on the third matrix. A row transformation mapping relationship in the first mapping relationship indicates a row identifier mapping relationship before and after position transformation of the bit data in the bit square matrix range. The row transformation mapping relationship may be constrained by using a global offset constraint factor and at least two local offset constraint factors. Aburst tolerance capability of information transmission can be improved.