通信学报 ›› 2018, Vol. 39 ›› Issue (4): 76-83.doi: 10.11959/j.issn.1000-436x.2018062

• 学术论文 • 上一篇    下一篇

LT码度分布改进及在认知无线电链路保持中的应用

易本顺1,2,姚渭箐1,3()   

  1. 1 武汉大学电子信息学院,湖北 武汉 430072
    2 武汉大学深圳研究院,广东 深圳 518057
    3 国网湖北省电力有限公司信息通信公司,湖北 武汉 430077
  • 修回日期:2018-01-22 出版日期:2018-04-01 发布日期:2018-04-29
  • 作者简介:易本顺(1965-),男,湖北武汉人,博士,武汉大学教授、博士生导师,主要研究方向为多媒体网络通信、信源信道编码、无线通信、光电信息系统等。|姚渭箐(1983-),女,湖北武汉人,博士,国网湖北省电力有限公司信息通信公司工程师,主要研究方向为无线通信与信道编码。
  • 基金资助:
    国家自然科学基金资助项目(61371125);深圳市基础研究基金资助项目(JCYJ20150630153917254)

Degree distribution optimization for LT codes and its application in link maintenance of cognitive radio

Benshun YI1,2,Weiqing YAO1,3()   

  1. 1 School of Electronic Information,Wuhan University,Wuhan 430072,China
    2 Shenzhen Institute,Wuhan University,Shenzhen 518057,China
    3 State Grid Hubei Information &Telecommunication Company Limited,Wuhan 430077,China
  • Revised:2018-01-22 Online:2018-04-01 Published:2018-04-29
  • Supported by:
    The National Natural Science Foundation of China(61371125);Basic Research Project of Shenzhen(JCYJ20150630153917254)

摘要:

度分布是影响Luby transform(LT)码性能的关键因素。基于认知无线电链路保持模型,采用双层寻优算法(THOA,two-layer hierarchical optimization algorithm),将译码开销较小时具有高译码成功率的改进的泊松分布(IPD,improved Poisson distribution)与译码开销较大时具有高译码成功率的顽健孤子分布(RSD,robust soliton distribution)的优点进行有机结合,构建新型LT码度分布。仿真结果表明,该新型度分布应用于基于LT码的认知无线电链路保持中,能有效提高次用户通信可靠性和有效性。

关键词: LT码, 认知无线电, THOA, 可译集, 有效吞吐量

Abstract:

The degree distribution has a great influence on the performance of Luby transform (LT) codes.Based on the link maintain model of cognitive radio system,the novel degree distribution of LT codes was obtained by using the THOA (two-layer hierarchical optimization algorithm) to combine the IPD (improved poisson distribution) which achieved high decoding success rate with low overhead and the robust soliton distribution (RSD) which achieved high decoding success rate with high overhead.Simulation results show that the proposed method with application to link maintenance in cognitive radio system can improve the reliability and efficiency of secondary communication.

Key words: LT codes, cognitive radio, THOA, ripple size, goodput

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