Joint FEC Decoding Chain for PS-QAM Signal Accuracy
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Solution Overview
Problem
In the PS-QAM system, the lack of correlation between FEC decoding and PS decoding results in poor FEC decoding performance and transmission capability due to separate processing of these functions at the receive end.
Innovation Solution
The proposed decoding method involves performing level-M FEC decoding on a received bit signal, checking the resulting signal, and then performing level-(M+1) FEC decoding based on the check result, with data processing applied when a preset threshold is reached to improve the accuracy of the decoded signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If FEC decoding and PS decoding are performed separately at the receive end, then the decoding process is simpler to implement, but the FEC decoding performance and system transmission capability deteriorate
Solution Approach 1:
The patent merges FEC decoding and PS decoding into a unified multi-level joint decoding process. The receive end performs level-M FEC decoding followed by checking, then level-(M+1) FEC decoding based on the check result, creating a correlated decoding chain that improves reliability while maintaining operational feasibility through structured integration
2Speed
If level-M FEC decoding is performed without checking the intermediate result, then the decoding process is faster, but the accuracy of the decoded signal deteriorates
Solution Approach 1:
The patent introduces a checking operation after level-M FEC decoding as a preliminary action before proceeding to level-(M+1) decoding. This intermediate check validates the decoded signal quality and provides feedback for the subsequent decoding stage, ensuring accuracy without significantly impacting overall decoding speed
Solution Approach 2:
The checking result from level-M decoding serves as feedback to control the level-(M+1) FEC decoding process. The receive end performs level-(M+1) decoding based on the first check result, creating a feedback loop that enhances decoded signal accuracy by adapting the decoding process to the actual signal quality
Data Source
AI summary
A decoding method performed by a receive end device is disclosed. The decoding method includes: receiving a first bit signal; performing level-M forward error correction (FEC) decoding on the first bit signal to obtain a second bit signal, where M is a positive integer greater than zero; checking the second bit signal to obtain a first check result; performing level-(M+1) FEC decoding on the second bit signal based on the first check result to obtain a third bit signal; and, upon determining that M+1 reaches a first preset threshold, performing data processing on the third bit signal to obtain a fourth bit signal, where the fourth bit signal is used by the receive end device to obtain service data transmitted by a transmit end device.