| 基于输出可译集的LT码联合度分布优化 |
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| 引用本文： | 戴新颖,王建萍.基于输出可译集的LT码联合度分布优化[J].系统工程与电子技术,2020,42(3):727-732. |
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| 作者姓名： | 戴新颖 王建萍 |
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| 作者单位： | 北京科技大学计算机与通信工程学院, 北京 100083 |
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| 基金项目： | 国家自然科学基金(61671055) |
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| 摘 要： | 喷泉码的编译码性能与其度分布息息相关,基于联合度分布的喷泉码编译码性能明显优于基于单一度分布的喷泉码编译码性能,但目前的联合度分布大多是简单的将两个度分布进行结合。输出可译集的取值波动可以表征喷泉码编译码的性能,本文基于输出可译集的特性设计了优化算法,用以求解泊松分布(poisson distribution, PD)和鲁棒孤子度分布(robust soliton distribution, RSD)结合的最优比例,得到新的度分布。仿真结果表明,相较于RSD,采用优化后的度分布的喷泉码性能有着显著提升。
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| 关 键 词： | 喷泉码 Luby变换码 联合度分布 可译集 |
| 收稿时间： | 2019-05-09 |
Optimization of combined degree distribution of LT codes based on output ripple size |
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| Xinying DAI,Jianping WANG.Optimization of combined degree distribution of LT codes based on output ripple size[J].System Engineering and Electronics,2020,42(3):727-732. |
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| Authors: | Xinying DAI Jianping WANG |
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| Affiliation: | School of Computer and Communication Engineering, University of Science and Technology Beijing, Beijing 100083, China |
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| Abstract: | The encoding/decoding performance of fountain codes is closely related to its degree distribution. The performance of the fountain codes based on the combined degree distribution is obviously better than that of the fountain codes based on the single degree distribution. However, the current combined degree distribution is mostly a simple combination of degree distribution. The fluctuation of the output ripple size can represent the performance of the fountain codes. The optimization algorithm based on the characteristics of the output ripple size is proposed. It is designed to get an optimal ratio of poisson distribution (PD) and robust soliton distribution (RSD), so that a new degree distribution is obtained. The simulation results show that compared with RSD, the optimized degree distribution can effectively improve the performance of fountain codes. |
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| Keywords: | fountain codes Luby transform (LT) codes combined degree distribution ripple size |
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