LT码中高效联合度分布的设计  

Design of Efficient Combined Degree Distribution in LT Codes

作　　者：刘聪 费炜 胡胜 LIU Cong;FEI Wei;HU Sheng(School of Electrical and Electronic Engineering,Hubei University of Technology,Wuhan 430068,China;Hubei Collaborative Innovation Center for High-efficiency Utilization of Solar Energy,Wuhan 430068,China)

机构地区：[1]湖北工业大学电气与电子工程学院,武汉430068 [2]湖北太阳能高效利用协同创新中心,武汉430068

出　　处：《电讯技术》2020年第1期64-69,共6页Telecommunication Engineering

基　　金：国家自然科学基金资助项目(61601177);湖北省教育厅科技攻关项目(Q20171401)

摘　　要：度分布是影响数字喷泉码性能的关键因素。传统的经典度分布如理想孤子分布、鲁棒孤子分布、二进制指数分布等,由于其明显的性能缺陷,已不能满足日益增长的多媒体业务的需求。为了设计一种性能优良的度分布,提出了两种新的联合度分布设计方案。首先,将泊松分布和滑动-鲁棒孤子分布相结合,构成一个比例系数的联合度分布;然后,将泊松分布、理想孤子分布、滑动-鲁棒孤子分布这三种度分布相结合,构成两个比例系数的联合度分布;最后,通过仿真查找的方法确定两种方案中的比例系数的最优值。仿真结果表明,提出的两种新方案和已知的经典度分布、单比例系数的联合度分布相比较,在译码成功率、误码率等性能指标上都有大幅提升。Degree distribution is a key factor affecting the performance of digital fountain codes.The classical degree distribution such as Ideal Soliton Distribution,Robust Soliton Distribution and Binary Exponential Distribution cannot satisfy the request of increasing multimedia service due to their obvious performance defects.In order to design a degree distribution with superior performance,two combined design schemes are proposed.First,the Poisson distribution and Robust Soliton Distribution are combined to form a joint degree distribution of proportional coefficient.Then the Poisson distribution,Ideal Soliton Distribution and Sliding-Robust Soliton Distribution are combined to form the joint degree distribution of the two proportional coefficients.Finally,the optimal value of the proportional coefficient in the two schemes is determined by the method of simulation search.The simulation results show that the two schemes proposed have greatly improved the ratio of decoding success and the bit error rate compared with the known single degree distribution and single-scale coefficient combined degree distribution.

关 键 词：数字喷泉码 LT码 联合度分布 编译码性能 

分 类 号：TN911.2[电子电信—通信与信息系统]