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arXiv · 2610.25644

PMR-Aided Shifted-Pruning SCL-Flip Decoding for CRC-Aided Polar Codes

Niloufar Hosseinzadeh·Mohammad Morsali·Mohsen Moradi·Hessam Mahdavifar
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Abstract

We propose a posterior-mass rescue (PMR)-aided shifted-pruning SCL-flip decoder for CRC-aided polar codes. After CRC-aided SCL (CA-SCL) and differential-metric shifted-pruning recovery fail to find a CRC-valid candidate, PMR locally continues discarded prefixes stored during the initial CA-SCL pass, ranked by estimated posterior mass, without increasing the shifted-pruning retry budget. Simulation results for a (128, 64) code with the Reed-Muller (RM) rate profile and a (256, 128) code with the polarization-weight (PW) rate profile, both using an 11-bit CRC, show lower observed FER than SCLF-Diff (T = 15) and the considered literature baselines under the evaluated recovery budgets, with observed FER close to that of SCLF-Diff (T = 20). At the reported moderate and high SNRs, the average reconstruction-aware path-step count is within a few percent of that of SCLF-Diff (T = 20), while at 2.0 dB it is 9.4% and 4.3% higher for the two codes, respectively. The proposed decoder also has a larger worst-case path-step bound.

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Niloufar Hosseinzadeh, Mohammad Morsali, Mohsen Moradi, Hessam Mahdavifar. 2026-10-19. PMR-Aided Shifted-Pruning SCL-Flip Decoding for CRC-Aided Polar Codes. https://arxiv.org/abs/2610.25644

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