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应用科学学报 ›› 2006, Vol. 24 ›› Issue (2): 176-180.

• 论文 • 上一篇    下一篇

IRA码在混合信道上的高斯估计

高宏峰1,2, 许宗泽1   

  1. 1. 南京航空航天大学信息科学与技术学院, 江苏南京 210016;
    2. 河南科技大学电信学院, 河南洛阳 471003
  • 收稿日期:2004-05-19 修回日期:2005-03-18 出版日期:2006-03-31 发布日期:2006-03-31
  • 作者简介:高宏峰,副教授,博士,研究方向:Turbo码、LDPC码、RA码等的研究及在通信系统中的应用,E-mail:gaohongfeng@tom.com;许宗泽,教授,博导,研究方向:编码理论及通信技术,E-mail:xzzem@yahoo.com

Gaussian Approximation of Irregular Repeat-Accumulate Codes over Mixed Gaussian/Erasure Channels

GAO Hong-feng1,2, XU Zong-ze1   

  1. 1. College of Information Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
    2. Electronic Information Engineering College, Henan University of Science and Technology, Luoyang 471003, China
  • Received:2004-05-19 Revised:2005-03-18 Online:2006-03-31 Published:2006-03-31

PDF

98

被引次数

3

摘要： 将高斯估计方法运用到IRA码在具有加性白色高斯噪声和删除干扰的混合信道上的性能分析中,导出了IRA码在该信道上概率密度进化的递归等式和误码率的解析表达式.根据所得的解析结果,对IRA码在混合信道上的渐进性能进行了预测并提出了IRA码的优化设计方法.

关键词: 不规则重复累积码, 高斯噪声, 随机删除, 高斯估计

Abstract: Gaussian approximation models the message density in message passing decoders as Gaussian distribution.In this paper, irregular repeat accumulate (IRA) codes over the mixed white Gaussian noise/erasure channels are designed using Gaussian approximation.Recursive equations of density evolution and analytic expressions of bit error rate are derived.The analytic results not only provide a way to predict asymptotic performance of IRA codes but also help us design good IRA codes over the mixed channel.Comparison between simulation results and thresholds computed from analytic results shows that predication from the theoretical results is accurate enough.The optimized IRA codes designed for the mixed channels have better performance than that of IRA codes designed for AWGN channels when the designed erasure probability is close to the actual probability.

Key words: irregular repeat-accumulate codes, Gaussian noise, random erasure, Gaussian approximation

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