Soft-Out Successive Cancelation Decoding and Its List Version for Polar Codes

作     者：Gao, Luqin Wu, Xiaofu Yang, Yufan Hu, Junquan Zhang, Suofei 

作者机构：Nanjing Univ Posts & Telecommun Natl Engn Res Ctr Commun & Networking Nanjing 210003 Peoples R China Army Engn Univ PLA Coll Commun Engn Nanjing 210000 Peoples R China Nanjing Univ Posts & Telecommun Sch Internet Things Nanjing 210003 Peoples R China 

出 版 物：《IEEE WIRELESS COMMUNICATIONS LETTERS》 (IEEE Wireless Commun. Lett.)

年 卷 期：2025年第14卷第3期

页      面：651-655页

核心收录：

学科分类：0810[工学-信息与通信工程] 0808[工学-电气工程] 08[工学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：National Key Laboratory of Wireless Communications Foundation [IFN202405] 

主　　题：Decoding Iterative decoding Polar codes Codes Vectors Scheduling Indexes Standards Wireless communication Telecommunications soft-output decoding SCAN decoding SCL decoding 

摘      要：Unlike the standard successive cancelation (SC) decoding of polar codes, soft cancelation (SCAN) decoding could provide soft outputs, which are required in iterative processing for concatenated polar-coded systems. However, its performance is largely limited due to the absence of a list version. This letter first proposes a novel soft-out SC (SoSC) algorithm, where the left-to-right message-passing akin to the SCAN decoding is performed to get soft outputs whenever the partial-sum update is activated during the SC decoding. This SoSC inherits the mechanism of hard-decisions along the path, which allows us to propose its list version, namely, soft-out SC list (SoSCL) decoding. Compared to the existing SCL-based soft decoding algorithms, the proposed SoSCL has a more rigorous mathematical interpretation and could achieve sound gain in iterative processing for various concatenated polar-coded systems.