基于智能手机和小波变换的人体动作识别.pdf

一种增强的极化码逐次抵消译码算法 1 1 1 2 3 韩冰 ，王云江 ，高晶亮 ，石莎 ，王潮 1 西安电子科技大学综合业务网理论及关键技术国家重点实验室，西安710071 2 西安电子科技大学生命科学技术学院，西安710071 3 上海大学特种光纤与光接入网重点实验室，上海 200071 摘要：极化码可以在长码时使用逐次抵消译码算法达到香农限，但是却又极高译码时延。通过 增加几个额外的可被预计算的数据结构，本文提出了一种简化修改方案使译码算法做到并行 化，而且这种方案也能对码率译码器的设计提供指导。 关键词：通信与信息系统，极化码，逐次抵消译码 中图分类号：G237.5 Enhanced Successive Cancellation Decoding of Polar Codes 1 1 1 2 3 Bing Han , Yun-Jiang Wang , Jing-Liang Gao , Sha Shi , Chao Wang 1 State Key Laboratory of Integrated Services Networks, Xidian University, Xi’an 710071 2 School of Life Science and Technology, Xidian University, Xi’an 710071 3 Key Laboratory of Special Fiber Optics and Optical Access Networks, Shanghai University, Shanghai, 200072 Abstract: Decoding polar codes can be accomplished by successive cancellation algorithms which can achieve Shannon capacity at long codeword length, while it suffers from a very high latency. We significantly improve this decoding scheme by a non-recursive modification which can be parallelized easily both in software and hardware. With help of some specific data structures that can be calculated in advance, our method also provides an guide to rate-compatible decoder design. Key words: CIS, Polar Codes, SC decoding Foundations: the Key Program of National Natural Science Foundation of China under Grants，NSFC under Grants ，the Specialized Research Fund for the Doctoral Program of Higher Education of China under Grant(20120203120001)，the Fundamental Research Funds for the Central