HARQ Retransmission Interleaving for Improved Code Weight Distribution
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Solution Overview
Problem
Existing HARQ-based communication methods fail to fully exploit channel coding gains due to retransmission only occurring upon decoding failure, limiting signal transmission performance.
Innovation Solution
Implement interleaving processing on information bit sequences during retransmissions, followed by subsequent encoding and decoding operations, to improve code weight distribution and enhance transmission performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If retransmission is performed only when decoding failure occurs at receive end, then transmission reliability is maintained at acceptable level, but signal transmission performance cannot be improved and channel coding gain cannot be fully explored
Solution Approach 1:
The patent applies preliminary action by performing interleaving processing on information bit sequences before retransmission. Specifically, in the tth retransmission, interleaving is performed on n groups of first information bit sequences (where n < m) to obtain interleaved bit sequences before encoding. This preliminary rearrangement of bit sequences improves code weight distribution and enables better transmission performance to be extracted from the channel coding, resolving the contradiction between maintaining reliability and improving transmission performance.
2Productivity
If interleaving processing is performed on information bit sequences during retransmission, then code weight distribution is improved and transmission performance is enhanced, but system complexity increases
Solution Approach 1:
The patent applies local quality by selectively performing interleaving processing only on n groups of first information bit sequences (where n < m) rather than on all m groups. This selective approach focuses the interleaving operation on specific portions of the data that benefit most from it, improving code weight distribution and transmission performance while avoiding the need to interleave the entire data set, thereby controlling system complexity.
Data Source
AI summary
This application discloses a communication method includes: obtaining a plurality of information bits in first transmission; grouping the plurality of information bits into m groups of first information bit sequences K1, . . . , Km; encoding the m groups of first information bit sequences to obtain a first target encoded codeword; sending the first target encoded codeword to a receive end; performing interleaving processing on n groups of first information bit sequences in the m groups of first information bit sequences in tth retransmission if the first transmission fails, to obtain m groups of first bit sequences X1, . . . , Xm; encoding the m groups of first bit sequences to obtain a second target encoded codeword; and sending the second target encoded codeword to the receive end. In this way, in a HARQ-based implementation, interleaving processing is performed on some information bit sequences in a retransmission process.