PAS Coding with Parallel Shaping-Bit Subcode Processing
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Solution Overview
Problem
High-order modulation in communication technologies, specifically using probability amplitude shaping (PAS), suffers from long latency due to serial decoding processes in channel coding and decoding scenarios.
Innovation Solution
A coding method and apparatus that parallelizes the processing of shaping bit positions by performing outer code coding and polar decoding independently for different subcodes, reducing latency by obtaining outer code codewords in parallel and then performing inner code coding to generate a coded sequence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If probability amplitude shaping (PAS) is used for high order modulation to improve system throughput, then throughput is improved, but coding latency increases due to serial decoding process
Solution Approach 1:
The patent segments the shaping bit positions into multiple groups, where each group corresponds to a different subcode of the inner code. This segmentation enables parallel processing of outer code coding for different subcodes, transforming the originally serial decoding process into a parallel architecture that reduces coding latency while maintaining high order modulation capabilities
Solution Approach 2:
The patent introduces a new dimension of parallelism by organizing shaping bit positions into multiple groups that can be processed simultaneously through different subcodes. This dimensional transformation from serial to parallel processing architecture enables throughput improvement without the latency penalty of traditional PAS methods
2Reliability
If serial decoding process is used for PAS coding, then decoding accuracy is maintained, but coding latency increases
Solution Approach 1:
By dividing shaping bit positions into multiple groups corresponding to different inner code subcodes, the patent enables segmented parallel processing that maintains decoding accuracy for each subgroup while reducing overall coding latency through simultaneous processing of multiple subcodes
Solution Approach 2:
The patent performs preliminary outer code coding in parallel for multiple subcodes before final inner code decoding. This preliminary parallel action prepares the data structure in advance, allowing the final decoding stage to maintain accuracy while the overall process benefits from reduced latency due to the parallel preparation phase
Data Source
AI summary
A coding method and apparatus are provided. The method includes: obtaining a to-be-coded sequence whose length is N, after an information bit is placed at an information bit position, wherein first preset bits are placed at shaping bit positions in a first position sequence, and shaping bit positions whose corresponding bits after polar coding belong to a same subcode of inner code belong to a same group; performing outer code coding on the to-be-coded sequence, to obtain a first outer code sequence whose length is N, based on which first outer code codeword bits corresponding to shaping bit position groups are obtained; obtaining a target outer code sequence based on the first outer code sequence and the first outer code codeword bits; and performing inner code coding on the target outer code sequence, to obtain and output a coded sequence. Probability amplitude shaping (PAS) coding latency can be reduced.