PAM-4 Encoding Scheme With Split Redundancy for Higher Code Rate
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Solution Overview
Problem
Existing digital communication systems face challenges in reducing the quantity of redundant bits in encoded sequences, leading to increased redundant information in symbol sequences during modulation, which affects interference resistance and code rate.
Innovation Solution
The proposed method involves encoding data into two parts with different encoding manners, where the first data is encoded using a BCH encoding manner and the second data using a product code encoding manner, and both are modulated using PAM-4, allowing for a balanced distribution of bits in the symbol sequence to minimize redundant bits and enhance code rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a relatively large quantity of redundant bits are comprised in an encoded sequence to improve error correction capability, then the error correction capability is improved, but the code rate decreases and redundant information in the symbol sequence increases
Solution Approach 1:
The encoded sequence is segmented into high-order bits and low-order bits, with different encoding manners applied to each segment. The first data (high-order bits) uses a first encoding manner with lower redundant bits, while the second data (low-order bits) uses a second encoding manner with higher redundant bits, resolving the contradiction by differentiating redundancy allocation across segments
Solution Approach 2:
Different encoding manners are applied to different parts of the data based on their specific requirements. The first data corresponding to high-order bits uses an encoding manner optimized for its position, while the second data corresponding to low-order bits uses a different encoding manner, allowing each local segment to have optimal redundancy levels
2Productivity
If the quantity of redundant bits in the encoded sequence is reduced to improve code rate, then the code rate is improved, but the error correction capability deteriorates
Solution Approach 1:
The data is divided into first data and second data, where the first data uses an encoding manner with lower redundancy (higher code rate) and the second data uses an encoding manner with higher redundancy (lower code rate), achieving an overall balance between code rate and error correction capability
Solution Approach 2:
Different encoding parameters are used for different data segments. The first encoding manner has different redundant bit quantity compared to the second encoding manner, allowing flexible adjustment of code rate and error correction capability for different parts of the transmitted data
3Productivity
If PAM-4 modulation is used to increase transmission efficiency, then transmission efficiency is improved, but the anti-interference capability of low bit signal deteriorates
Solution Approach 1:
Different encoding manners are applied to high-order bits and low-order bits based on their different anti-interference requirements in PAM-4 modulation. The first data (high-order bits) uses an encoding manner suitable for its stronger anti-interference position, while the second data (low-order bits) uses an encoding manner that compensates for its weaker anti-interference capability
Solution Approach 2:
The encoding scheme treats high-order bits and low-order bits asymmetrically, applying different encoding manners to each. This asymmetry compensates for the inherent asymmetry in PAM-4 modulation where low-order bits have weaker anti-interference capability, achieving balanced overall performance
Data Source
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AI summary
This application provides an encoding method, comprising: encoding first data in a first encoding manner to generate a first encoded sequence; encoding second data in a second encoding manner to generate a second encoded sequence, where a quantity of bits comprised in the first data is greater than a quantity of bits comprised in the second data, and a quantity of bits comprised in the first encoded sequence is equal to a quantity of bits comprised in the second encoded sequence; generating a symbol sequence by performing a PAM-4 modulation on an input signal, where the input signal includes the first encoded sequence and the second encoded sequence, the first encoded sequence corresponds to a high bit of the input signal, and the second encoded sequence corresponds to a low bit of the input signal; and sending the symbol sequence. The encoding method provided in this application helps reduce a quantity of redundant bits, helps improve a code rate, and can reduce redundant information carried in a modulated symbol sequence.