IRA码结构优化与高斯逼近分析

Analysis for Gaussian Approximation and Structure Optimization of IRA Codes

作者：黎新(民航飞行技术与飞行安全科研基地, 四川广汉 618307)；傅强(民航飞行技术与飞行安全科研基地, 四川广汉 618307)；文磊(国防科技大学电子科学与工程学院，湖南长沙 410073)

Author：(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)

收稿日期：2007-01-31 年卷（期）页码：2007,39(5):159-163

期刊名称：工程科学与技术

Journal Name：Advanced Engineering Sciences

关键字：IRA码；Tanner图；高斯逼近；度

Key words：IRA codes; Tanner graph; Gaussian approximation; degree

基金项目：国家自然科学基金民航联合基金资助项目(60572176)

中文摘要

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。

英文摘要

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.

【关闭】

论文摘要

IRA码结构优化与高斯逼近分析

Analysis for Gaussian Approximation and Structure Optimization of IRA Codes