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arXiv 2201.07843cs.ITmath.IT
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5G短消息中卷积码和极化码的CRC辅助列表解码

CRC-Aided List Decoding of Convolutional and Polar Codes for Short Messages in 5G

Jacob King, Alexandra Kwon, Hengjie Yang, William Ryan, Richard D. Wesel

摘要:

本文探讨了用于短消息的卷积码和极化码的列表解码,例如5G物理广播信道中的短消息。循环冗余校验(CRC)用于从可能码字的列表中选择码字。5G标准中的一个示例使用24位CRC和512位极化码对32位消息进行编码,其中通过重复添加额外的位以实现32/864的非常低的速率。本文表明,优化CRC长度提高了该极化码的$E_b/N_0$性能,其中$E_b/N_0$是每数据比特的能量与噪声功率谱密度的比率。此外,通过用具有距离频谱最优(DSO)CRC的咬尾卷积码(TBCC)替换极化码,实现了甚至更好的$E_b/N_0$性能。本文确定了最佳的CRC长度,以尽量减少帧出错率(FER)的速率为1/5 TBCC在特定值的$E_b/N_0$。我们还表明,这种优化的TBCC/CRC可以在5G极化码的32/864的极低速率下获得同样出色的$E_b/N_0$性能,其中低速率是通过重复实现的。我们表明,所提出的TBCC/CRC级联码在FER和解码运行时间方面都优于5G标准中描述的PBCH极化码。我们还探讨了未检测到的出错率和删除率之间的权衡CRC大小的变化。

英文摘要:

This paper explores list decoding of convolutional and polar codes for short messages such as those found in the 5G physical broadcast channel. A cyclic redundancy check (CRC) is used to select a codeword from a list of likely codewords. One example in the 5G standard encodes a 32-bit message with a 24-bit CRC and a 512-bit polar code with additional bits added by repetition to achieve a very low rate of 32/864. This paper shows that optimizing the CRC length improves the $E_b/N_0$ performance of this polar code, where $E_b/N_0$ is the ratio of the energy per data bit to the noise power spectral density. Furthermore, even better $E_b/N_0$ performance is achieved by replacing the polar code with a tail-biting convolutional code (TBCC) with a distance-spectrum-optimal (DSO) CRC. This paper identifies the optimal CRC length to minimize the frame error rate (FER) of a rate-1/5 TBCC at a specific value of $E_b/N_0$. We also show that this optimized TBCC/CRC can attain the same excellent $E_b/N_0$ performance with the very low rate of 32/864 of the 5G polar code, where the low rate is achieved through repetition. We show that the proposed TBCC/CRC concatenated code outperforms the PBCH polar code described in the 5G standard both in terms of FER and decoding run time. We also explore the tradeoff between undetected error rate and erasure rate as the CRC size varies.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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