计算机应用 ›› 2011, Vol. 31 ›› Issue (04): 1145-1147.DOI: 10.3724/SP.J.1087.2011.01145

• 典型应用 • 上一篇    下一篇

高性能准循环低密度奇偶校验码在导航信号中的应用

钱宏1,李广侠2,常江2   

  1. 1. 解放军理工大学 通信工程学院,南京 210007
    2. 解放军理工大学 军事卫星通信重点实验室,南京 210007
  • 收稿日期:2010-10-14 修回日期:2010-11-26 发布日期:2011-04-08 出版日期:2011-04-01
  • 通讯作者: 钱宏
  • 作者简介:钱宏(1986-),男,江苏无锡人,硕士研究生,主要研究方向:卫星通信、卫星导航;
    李广侠(1964-),男,浙江永康人,教授,博士生导师,主要研究方向:卫星通信、卫星导航、卫星测控;
    常江(1972-),男,河北唐山人,副教授,主要研究方向:卫星通信、卫星导航。
  • 基金资助:
    国家863计划项目(2008AA12Z30)

Application of quasi-cycle low-density parity check codes with high performance to satellite navigation signals

Hong QIAN1,Guang-xia LI2,Jiang CHANG2   

  1. 1. Institute of Communications Engineering, PLA University of Science and Technology, Nanjing Jiangsu 210007, China
    2. Laboraty of Military Satellite Communication, PLA University of Science and Technology, Nanjing Jiangsu 210007, China
  • Received:2010-10-14 Revised:2010-11-26 Online:2011-04-08 Published:2011-04-01
  • Contact: Hong QIAN

摘要: 全球定位系统(GPS)在其现代化计划中选择低密度奇偶校验(LDPC)码作为其将来的L1C电文的信道编码方案,能够获得优异的译码性能,但复杂度也相对提高,所采用随机LDPC码的编码器和解码器的硬件实现较为困难。在802.16e协议中提出的LDPC码的基础上,提出一种增强型的准循环低密度奇偶校验(QC-LDPC) 码,其校验矩阵同时具有准循环结构和近似下三角结构,且最小圈长为8,克服了随机LDPC码的缺点。仿真结果表明,所构造的QC-LDPC码性能优于802.16e协议中的LDPC码和GPS L1C电文中采用的LDPC码,对我国“COMPASS”导航系统的信道编码方案具有参考价值。

关键词: 卫星无线电导航, 信道编码, 低密度奇偶校验码, 基础矩阵, 短环

Abstract: In the Global Positioning System (GPS) modernization plan, Low-Density Parity Check (LDPC) code is used for the channel coding scheme of L1C signals, which brings out excellent decoding performance, but higher complexity. The encoder and decoder of random constructed LDPC codes are difficult to implement with Very Large Scale Integration (VLSI). A kind of enhanced Quasi-Cycle LDPC (QC-LDPC) codes based on LDPC codes was proposed, which had both quasi-cycle structure and approximate lower triangular form. The girth of the proposed codes is 8. The simulation results show that QC-LDPC codes are superior to LDPC codes used in 802.16e and GPS L1C signals, and it is helpful to the development of new signal scheme of COMPASS navigation system.

Key words: radio navigation satellite system, channel coding, Low-Density Parity Check (LDPC) code, base matrix, short cycle

中图分类号: