LDPC Rate Matching to Mitigate Over-Puncturing in OFDM Frames

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Solution Overview

Problem

Existing LDPC rate matching in wireless communications experiences over-puncturing issues that need mitigation.

Innovation Solution

Implementing a system that either removes puncturing, modifies LDPC rate matching to add more symbols, or changes the over-puncture criterion for small size resource units to reduce the puncturing ratio.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If LDPC rate matching uses traditional puncturing method, then data transmission can be achieved, but performance degradation occurs due to over-puncturing

Engineering Contradiction:

Improvedata transmission efficiencyVSAvoidtransmission performance

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent changes the fundamental parameter of rate matching from puncturing to repetition. Instead of removing punctured bits, the system repeats certain LDPC codeword bits to achieve the required number of transmitted bits. This parameter change eliminates over-puncturing issues while maintaining data transmission efficiency and improving transmission performance through enhanced redundancy.

Inventive Principle:

Principle #35Parameter changes

2Quantity of substance

If puncturing ratio is increased to fit more data in limited symbols, then transmission capacity improves, but error performance deteriorates

Engineering Contradiction:

Improvedata capacityVSAvoiderror performance

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The patent inverts the traditional puncturing approach by using repetition instead. Rather than removing bits to increase capacity, the system repeats codeword bits to achieve the desired transmission capacity while inherently improving error performance through increased redundancy. This inversion resolves the contradiction between capacity and error performance.

Inventive Principle:

Principle #13The other way round (Inversion)

3Reliability

If LDPC codeword size is increased to improve error correction, then transmission reliability improves, but resource allocation becomes less efficient

Engineering Contradiction:

Improveerror correction capabilityVSAvoidresource allocation efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent implements dynamic resource allocation where the number of repetition instances is adjusted based on channel conditions and traffic requirements. This dynamic approach allows the system to optimize between error correction capability and resource efficiency by adapting the repetition level to actual transmission needs, rather than using fixed large codeword sizes.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12451905B2Over-puncture mitigation in LDCP rate matching

Publication Date: 2025.10.21 INTEL CORP

AI summary

This disclosure describes systems, methods, and devices related to over-puncture mitigation. A device may generate a frame comprising a payload having a payload size associated with a number of bits. The device may determine a low-density parity-check (LDPC) codeword size based on the payload size. The device may calculate a number of codewords based on the payload size. The device may calculate a number of shortening bits and a number of LDPC padding bits based on the number of codewords. The device may calculate a number of orthogonal frequency division multiplexing (OFDM) symbols for containing the number of codewords. The device may cause to send the frame with the number of OFDM symbols to a station device.