Joint Channel Coding Modulation for Optical Communication
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing optical communication systems face challenges in achieving high spectral efficiency and low power consumption due to limitations in fiber bandwidth resources, channel impairments, and the independence of FEC and high-order modulation modules.
Innovation Solution
The implementation of a joint channel coding modulation method using polar codes, which integrates channel coding and high-order modulation to enhance spectral efficiency, reduce latency, and lower power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-order modulation is used to improve spectral efficiency, then spectral efficiency is improved, but the minimum Euclidean distance among constellation points decreases and the system becomes more sensitive to channel impairments
Solution Approach 1:
The patent merges channel coding and high-order modulation into a unified joint channel coding modulation framework. The coded bits are directly mapped to modulation symbols through a unified mapping relationship, integrating two previously independent functional modules. This integration allows the system to achieve both high spectral efficiency through high-order modulation and high reliability through channel coding, resolving the contradiction between the two requirements.
2Reliability
If forward error correction channel coding is used to improve signal sensitivity and reliability, then signal sensitivity and reliability are improved, but system complexity increases
Solution Approach 1:
The patent combines channel coding and modulation into a single joint processing framework, where the channel encoder and modulator work together through a unified mapping relationship. This integration reduces the number of separate functional modules and interfaces, thereby reducing system complexity while maintaining the reliability benefits of forward error correction.
Solution Approach 2:
The joint channel coding modulation framework serves multiple functions simultaneously: it provides error correction through channel coding, achieves high spectral efficiency through high-order modulation, and reduces system complexity through integration. This multi-functionality allows the system to achieve reliability improvements without proportionally increasing complexity.
3Productivity
If channel coding and high-order modulation are kept as independent functional modules, then system design is simpler, but spectral efficiency cannot be maximized due to lack of mathematical correlation integration
Solution Approach 1:
The patent integrates channel coding and high-order modulation into a unified joint processing framework with a mathematically correlated structure. The coded bits are mapped to modulation symbols through a unified mapping relationship that establishes direct mathematical correlations between the coding and modulation domains. This integration maximizes spectral efficiency by eliminating the independence barrier while the systematic framework controls the resulting integration complexity.
Data Source
AI summary
An optical communication method and system with high spectral efficiency and low power consumption based on joint channel coding modulation relates to the technical field of high-speed fiber communication. The method includes a data acquisition step, a symbol multiplexing joint channel coding modulation step, a signal optical communication step, a channel equalization step, and a symbol demultiplexing step. The optical communication method and system improves the problems of relative independence of forward error correction channel coding (FEC) and high order modulation function modules, long code length dependence of FEC, limited spectral efficiency promotion under the limitation of fiber nonlinear effect, and high FEC decoding latency and power consumption in optical communication system. It is beneficial to improving the spectral efficiency and capacity of a coherent optical communication system and optimizing the system latency and power consumption.