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.

翻译：本研究探讨利用现代码型无关译码器将CA-SCL从不完全译码器转化为完全译码器的方法。当CA-SCL无法通过CRC校验识别有效码字时，我们采用码型无关译码器来获取满足CRC条件的码字。实验证明，该方法可使5G新空口标准中的CA极化码在误块率上获得最高0.2 dB的性能增益。若原始信息采用系统化CA极化码编码，性能增益可提升至0.2~1 dB。结合最新的分块软输出技术进展，我们进一步论证了即使将CRC用于纠错场景，仍能有效控制未检错误率。