| IRA码结构优化与高斯逼近分析 |
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| 引用本文： | 黎新,傅强,文磊.IRA码结构优化与高斯逼近分析[J].四川大学学报(工程科学版),2007,39(5):159-163. |
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| 作者姓名： | 黎新 傅强 文磊 |
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| 作者单位： | 1. 民航飞行技术与飞行安全科研基地,四川,广汉,618307
2. 国防科技大学,电子科学与工程学院,湖南,长沙,410073 |
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| 摘 要： | 码结构是决定IRA码性能的重要因素,因此利用高斯逼近对IRA码结构进行了优化。介绍了IRA码的图模型理论,给出了IRA码的Tanner图结构。分析了度为2的变量节点对码结构的影响。在AWGN信道下,基于给定的噪声方差,对IRA码的高斯逼近进行了研究,设计度分布多项式。基于高斯逼近原理设计出IRA码,并进行计算机仿真。仿真结果表明这类码相对于MacKay法构造的LDPC码能带来性能上的提高,并且具有良好的消息收敛特性。
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| 关 键 词： | IRA码 Tanner图 高斯逼近 度 |
| 文章编号： | 1009-3087（2007）05-0159-05 |
| 收稿时间： | 2007-01-31 |
| 修稿时间： | 2007年1月31日 |
Analysis for Gaussian Approximation and Structure Optimization of IRA Codes |
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| LI Xin,FU Qiang,WEN Lei.Analysis for Gaussian Approximation and Structure Optimization of IRA Codes[J].Journal of Sichuan University (Engineering Science Edition),2007,39(5):159-163. |
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| Authors: | LI Xin FU Qiang WEN Lei |
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| Affiliation: | CAAC Scientific Rearch Base of Civil Aviation Flight Technol. and Safety, Guanghan 618307, China;CAAC Scientific Rearch Base of Civil Aviation Flight Technol. and Safety, Guanghan 618307, China;School of Electronic Sci. and Eng., National Univ. of Defense Technol., Changsha 410073, China |
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| Abstract: | Code structure is an important factor which affects performance of IRA codes.THe structure of IRA codes was optimized based on Gaussian approximation.The graph model theory of IRA codes was introduced,and the Tanner graph was presented.The impact of 2 degree to the structure of codes was analysed.Based on given noise variance,the Gaussian approximation of IRA codes was researched on AWGN channel,and the degree sequences was designed.IRA codes were designed based on Gaussian approximation and simulated by computer.Simulation results showed that the IRA codes have better performance than MacKay LDPC codes,and the convergence of message are well. |
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| Keywords: | IRA codes Tanner graph Gaussian approximation degree |
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