Robust Channel Coding and Modulation for Data Frame Security
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Solution Overview
Problem
Existing communication systems face challenges in ensuring high reliability and security for robust channels, particularly in managing and maintaining channels embedded within data channels, where the reliability of management and maintenance channels is often tied to data channels, and methods to improve this are inadequate.
Innovation Solution
A method and apparatus that form a data frame on the interface between the PMD and PMS-TC layers, where RC bit data is treated as uncoded and service bit data is coded, and both are mapped onto subcarriers, with LDPC coding used to enhance coding efficiency and security, ensuring robust information transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all bit data in the DMT data frame is coded, then information transmission security is improved, but the coding rate decreases and throughput during decoding increases
Solution Approach 1:
The patent segments the bit data in the DMT data frame into two distinct parts: RC bit data and service bit data. This segmentation allows different coding strategies to be applied to each part - RC bit data remains uncoded to maintain high coding rate, while service bit data is coded to ensure information transmission security. This resolves the contradiction by applying segmentation to achieve both high coding rate and security simultaneously.
2Reliability
If RC bit data is coded, then information transmission security is improved, but the RC channel coding efficiency decreases
Solution Approach 1:
The patent extracts RC bit data from the overall data frame and treats it separately from service bit data. By taking out the RC bit data and leaving it uncoded while coding only the service bit data, the system maintains high RC channel coding efficiency while still providing security protection for the service data. This extraction approach resolves the contradiction by isolating the RC channel data from the coding process.
3Device complexity
If management and maintenance channels are embedded in data channels, then system complexity is reduced, but channel reliability becomes dependent on data channel reliability
Solution Approach 1:
The patent applies local quality by assigning different reliability characteristics to different parts of the data frame. The RC bit data portion is designed with uncoded transmission for high reliability and low delay, while service bit data uses coding for security. This local differentiation allows the management and maintenance channel to achieve independence from data channel reliability conditions, resolving the contradiction between simplicity and reliability independence.
Data Source
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AI summary
Embodiments of the present invention provide a robust channel RC-supporting coding and modulation method, including: forming, on an interface between a PMD layer and a PMS-TC layer, a data frame by using bit data carried in a DMT symbol; determining first-part bit data in the data frame as uncoded bit data on the interface between the PMD layer and the PMS-TC layer, where the first-part bit data includes RC bit data, and coding second-part bit data in the data frame to obtain coded bit data; and mapping, at the PMD layer, the uncoded bit data and the coded bit data onto multiple subcarriers corresponding to the data frame, and performing modulation to obtain modulated subcarriers, where the RC bit data is mapped onto at least one RC subcarrier. The present invention further provides an RC channel-supporting coding and modulation apparatus. According to the present invention, not only a coding/decoding rate of the data frame can be improved, but also information transmission security can be ensured.