LDPC-Coded Bit Interleaving for Burst Interference Decoding
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Solution Overview
Problem
Wireless communications systems face challenges in resisting burst interference, which can lead to decoding failures and reduced throughput due to the differential importance of bits in LDPC code transmission.
Innovation Solution
The proposed solution involves interleaving bit sequences encoded using an LDPC code matrix to disperse bits of varying importance, thereby reducing the impact of burst interference and enhancing the LDPC code's resistance to such interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If all information bits and parity bits are sent during initial transmission based on preset code rate, then the LDPC code supports flexible bit rate and IR-HARQ, but burst interference can damage important bit information causing decoding failure and reduced system throughput rate
Solution Approach 1:
The patent segments the bit sequence into different types (information bits, parity bits with column weight greater than 1, parity bits with column weight equal to 1) and applies different handling strategies to each segment. During initial transmission, all bit types are sent; during retransmission, only parity bits with column weight greater than 1 are sent, avoiding retransmission of parity bits with column weight equal to 1 to reduce interference impact.
Solution Approach 2:
The patent identifies that different bits have different importance levels based on their column weights in the LDPC code matrix. Parity bits with column weight greater than 1 are identified as more important for decoding success, while parity bits with column weight equal to 1 are less critical. This local quality differentiation enables targeted retransmission strategies.
2Reliability
If parity bits with column weight greater than 1 are retransmitted during retransmission, then decoding success rate improves, but transmission overhead increases
Solution Approach 1:
The patent extracts and identifies the specific subset of parity bits that have column weight greater than 1 from the complete parity bit sequence. During retransmission, only this extracted subset is transmitted, rather than retransmitting all parity bits. This extraction approach reduces transmission overhead while maintaining decoding success rate.
Solution Approach 2:
Instead of retransmitting all parity bits (excessive action), the patent transmits only the critical subset of parity bits with column weight greater than 1 (partial action). This partial retransmission is sufficient to improve decoding success rate without incurring the overhead of complete retransmission.
3Productivity
If parity bits with column weight equal to 1 are excluded from retransmission, then transmission efficiency improves, but decoding performance may be affected
Solution Approach 1:
The patent changes the transmission parameter strategy by differentiating between bit types based on their column weight parameter. Parity bits with column weight equal to 1 are excluded from retransmission, while other bits are retransmitted. This parameter-based differentiation optimizes the balance between transmission efficiency and decoding performance.
Data Source
AI summary
A data transmission method, a data sending device, and a data receiving device are provided. The method includes: encoding, by a data sending device, information data by using a low-density parity-check (LDPC) code matrix, to obtain a bit sequence, where the bit sequence includes a first bit sequence, and the first bit sequence includes at least one information bit in the bit sequence; interleaving, the first bit sequence to obtain a first interleaved bit sequence; performing, modulation based on the first interleaved bit sequence to obtain a sending signal, and sending the sending signal. The method also includes: demodulating, by a data receiving device, a receiving signal to obtain a soft value sequence; and de-interleaving, the soft value sequence, to obtain a soft value sequence of a first bit sequence. This can improve a capability of an LDPC code resisting burst interference.