Local Pre-Transformation Polar Encoding for URLLC Decoder Reliability

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Solution Overview

Problem

Polar codes with pre-transformation configurations experience performance deterioration in channel polarization-based decoders, particularly in ultra-reliable low-latency communication (URLLC) systems where high reliability and low latency are critical.

Innovation Solution

The implementation of a local pre-transformation encoder that splits input signals into specific and remaining information signals, performs parallel local pre-transformation using upper-triangular matrices, and limits consecutive information bits to improve polar transformation efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If pre-transformation is configured in polar codes, then encoding capability is improved, but decoder performance deteriorates

Engineering Contradiction:

Improveencoding capabilityVSAvoiddecoder performance

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The encoder divides the input signal into specific information signals and remaining information signals, then applies local pre-transformation only to specific portions rather than the entire signal. This segmentation allows the system to gain encoding benefits while limiting the impact on decoder performance.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies pre-transformation locally to specific information signals rather than uniformly to all input signals. By making the transformation local and selective, the system improves encoding capability for critical portions while preserving decoder performance on other portions.

Inventive Principle:

Principle #3Local quality

2Productivity

If local pre-transformation is applied to all remaining information signals, then encoding performance is improved, but decoding complexity increases

Engineering Contradiction:

Improveencoding performanceVSAvoiddecoding complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

Instead of applying pre-transformation to all remaining information signals, the patent applies it only to specific information signals that benefit most from the transformation. This partial application reduces decoding complexity while maintaining encoding performance benefits.

Inventive Principle:

Principle #16Partial or excessive action

3Productivity

If consecutive information bits are increased in connection signals, then transformation efficiency is improved, but error propagation increases

Engineering Contradiction:

Improvetransformation efficiencyVSAvoiderror propagation

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent modifies the structure of connection signals by limiting the number of consecutive information bits. This parameter change balances transformation efficiency with error propagation control, optimizing both performance and reliability.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250175279A1Method for improving polar code performance using local pre-transformation

Publication Date: 2025.05.29 POSTECH ACADEMY INDUSTRY FOUNDATION

AI summary

An encoder using local pre-transformation is provided. According to an embodiment, the encoder may include a bit splitting unit configured to generate a specific information signal and remaining information signals by splitting an input signal, a pre-transform unit configured to generate connection signals by performing, in parallel, local pre-transformation, based on each of the remaining information signals, and a polar transform unit configured to generate an output signal by performing polar transformation, based on the specific information signal and the connection signals.