| 喷泉码中LT码的次优度分布 |
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| 引用本文： | 朱宏鹏,张更新,谢智东.喷泉码中LT码的次优度分布[J].应用科学学报,2009,27(1):6. |
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| 作者姓名： | 朱宏鹏 张更新 谢智东 |
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| 作者单位： | 解放军理工大学通信工程学院，南京210007 |
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| 基金项目： | 国家自然科学基金，教育部留学问国人员科研启动基金 |
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| 摘 要： | 度分布是影响LT码译码效率的关键因素. 通过对译码过程中预处理集的分析，提出LT码的最优度分布，指出其在实际应用中存在的问题，并在此基础上提出实用的次优度分布. 测试结果表明，采用次优度分布的LT码在平均译码效率、最优译码效率、译码效率方差三方面性能都优于稳健孤立子度分布，研究结果对提高数据分发应用的分发效率具有实用价值.
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| 关 键 词： | 喷泉码 LT码 次优度分布 稳健孤立子度分布 |
| 收稿时间： | 2008-03-04 |
| 修稿时间： | 2008-10-20 |
Suboptimal Degree Distribution Algorithm of LT Codes of Digital Fountain |
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| ZHU Hong-peng,ZHANG Geng-xin,XIE Zhi-dong.Suboptimal Degree Distribution Algorithm of LT Codes of Digital Fountain[J].Journal of Applied Sciences,2009,27(1):6. |
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| Authors: | ZHU Hong-peng ZHANG Geng-xin XIE Zhi-dong |
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| Institution: | Institute of Communication Engineering, PLA University of Science and Technology, Nanjing 210007, China |
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| Abstract: | Degree distribution is key to the decoding efficiency of LT codes. With analysis of the variation of preprocessing set, this paper proposes the Optimal Degree Distribution (ODD) of LT codes and analyzes its drawbacks in realization. On the basis of ODD, a practical Suboptimal Degree Distribution (SODD) is put forward. Through testing, with respect to the mean value, the top value and variance of decoding efficiencies, LT codes with SODD perform better than that with Robust Soliton Degree Distribution. The conclusion of research is practically valuable in improving efficiencies of data distribution applications. |
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| Keywords: | digital fountain LT codes suboptimal degree distribution robust soliton degree distribution |
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