电信科学 ›› 2009, Vol. 25 ›› Issue (12): 17-23.doi: 10.3969/j.issn.1000-0801.2009.12.005

• 研究与开发 • 上一篇    下一篇

改善LT码性能的预译码集优化方法研究

刘峰1,吕晓鹏1,夏宏飞2,许建国2   

  1. 1 南京邮电大学图像处理与图像通信江苏省重点实验室 南京 210003
    2 中兴通讯股份有限公司 南京 2100121
  • 出版日期:2009-12-15 发布日期:2009-12-15
  • 基金资助:
    江苏省高校自然科学重大基础研究项目;中兴通讯基金资助项目

Research on the Ripple Optimizing Methods to Improve Performance of LT Code

Feng Liu1,Xiaopeng Lv1,Hongfei Xia2,Jianguo Xu2   

  1. 1 NUPT Image Processing and Image Communication Laboratory of Jiangsu Province，Nanjing 210003，China
    2 ZTE Telecom Co.，Ltd.，Nanjing 210012，China
  • Online:2009-12-15 Published:2009-12-15

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摘要：

喷泉码是第一种与码率无关的编码方式。LT码是在删除信道下性能优异的稀疏随机线性喷泉码。与传统编码相比，大大降低了编译码的复杂度。通过分析影响LT码性能的预译码集，提出了优化LT码预译码集的方法。主要在编码端改变初始预译码集大小以及修改度为2的生成矩阵，在译码端利用编码冗余情况来破解译码停止集，同时消除短环。大量的数据仿真结果表明本文方法对译码性能有明显的改善。

关键词: 喷泉码, 纠删码, 删除信道, 预译码集

Abstract:

LT codes have outstanding performance as a sparse random linear fountain code in erasure channels. Compared with traditional codes，they greatly reduce the complexity of encoding and decoding process. With analysis of the ripple which influences the performance of LT codes，this paper proposed a approach to optimize the ripple through changing the initial size of ripple，modifying generating matrixes of degree 2，and exploiting redundancies to crack stopping set，meanwhile it eliminates short cycle.

Key words: fountain code, erasure control code, erasure channel, ripple

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