CRC-MPAC码及其高效译码  

CRC-MPAC Codes and Its Efficient Decoding

作　　者：易方博 蔡作鑫 梁积卫 陈立[1] YI Fangbo;CAI Zuoxin;LIANG Jiwei;CHEN Li(Sun Yat-sen University,Guangzhou 510006,China)

机构地区：[1]中山大学,广东广州510006

出　　处：《移动通信》2025年第2期36-42,共7页Mobile Communications

基　　金：国家自然科学基金“椭圆码的高效代数译码与应用”(62071498);国家自然科学基金“面向新一代通信网络的编码:U-UV码”(62471503);广东省自然科学基金“面向6G网络的新型编码技术”(2024A1515010213)。

摘　　要：Polar码是第一类被理论证明可达信道容量的信道编码,它与Cyclic Redundancy Check(CRC)码级联的改进方案已经被应用于5G通信网络。Polarization-Adjusted Convolutional(PAC)码是Polar码与卷积变换级联的改进方案。在中短码长下,使用Fano译码的PAC码性能比Polar码更优异,但译码时延和复杂度均很高。为实现更优的性能与复杂度折中,提出CRCModified PAC(CRC-MPAC)级联码用CRC码作为外码以及Modified PAC(MPAC)码作为内码。为此,进一步提出CRC Aided Hybrid Fano-Successive Cancellation(CA-HFSC)译码实现该码的高纠错力,其中,CRC码的检错特性不但保证译码输出的合法性,而且没有给译码过程带来过多的复杂度。本研究的仿真结果进一步展现了CRC-MPAC的高纠错能力和低译码复杂度。因此CRC-MPAC码可望更好地适应实际应用场景,是面向6G通信网络的优异信道编码方案。Polar codes are the first type of channel codes proven theoretically to achieve channel capacity.The improved scheme of Polar codes cascaded with cyclic redundancy check(CRC)codes has been applied to 5G communication networks.Polarizationadjusted convolutional(PAC)code is an improved scheme of the cascade of Polar codes with convolution transform.For medium and short code lengths,PAC codes using Fano decoding offer better performance than Polar codes but at the cost of considerably high decoding latency and complexity.In order to achieve an improved performance-complexity tradeoff,the CRC-modified PAC(CRC-MPAC)cascade code is proposed with a CRC code as the outer code and a modified PAC(MPAC)code as the inner code.Correspondingly,this paper further proposes a CRC aided hybrid Fano-successive cancellation(CAHFSC)decoding scheme to achieve high error-correcting capability for CRC-MPAC codes.In this context,the error detection capability of the CRC code not only ensures the validity of the decoding output but also avoids excessive complexity on the decoding process.Simulation results further demonstrate the high error correction capability and low decoding complexity of CRC-MPAC codes.Therefore,the CRC-MPAC codes are expected to better adapt to practical application scenarios,which make this scheme an excellent channel coding scheme for 6G communication networks.

关 键 词：短码 Polar码 PAC码 6G 

分 类 号：TN929.5[电子电信—通信与信息系统]