Improving the decoding performance of CA-polar codes
Information Theory
2025-12-12 v1 Signal Processing
math.IT
Abstract
We investigate the use of modern code-agnostic decoders to convert CA-SCL from an incomplete decoder to a complete one. When CA-SCL fails to identify a codeword that passes the CRC check, we apply a code-agnostic decoder that identifies a codeword that satisfies the CRC. We establish that this approach gives gains of up to 0.2 dB in block error rate for CA-Polar codes from the 5G New Radio standard. If, instead, the message had been encoded in a systematic CA-polar code, the gain improves to 0.2 ~ 1dB. Leveraging recent developments in blockwise soft output, we additionally establish that it is possible to control the undetected error rate even when using the CRC for error correction.
Keywords
Cite
@article{arxiv.2512.10223,
title = {Improving the decoding performance of CA-polar codes},
author = {Jiewei Feng and Peihong Yuan and Ken R. Duffy and Muriel Médard},
journal= {arXiv preprint arXiv:2512.10223},
year = {2025}
}