| 基于高斯近似的IRA码构造算法研究 |
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| 引用本文： | 于聪梅,雷菁,文磊.基于高斯近似的IRA码构造算法研究[J].无线电通信技术,2007,33(4):21-24. |
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| 作者姓名： | 于聪梅 雷菁 文磊 |
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| 作者单位： | 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： | 介绍了非规则重复累积码(IRA)的结构,对其Tanner图和校验矩阵进行了分析。IRA码的构造分为优化度分布和设计奇偶校验矩阵2部分。在AWGN信道下,对给定的噪声方差,采用高斯近似的方法优化度分布并得出优化结果。根据度分布和相应规则设计奇偶校验矩阵,给出了设计步骤。对设计出的码进行计算机仿真,结果表明这类码相对于计算机随机构造的LDPC码能带来性能上的提高,且随码长增加,码的性能有明显改善。
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| 关 键 词： | 非规则重复累积码 LDPC码 高斯近似 度分布 |
| 文章编号： | 1003-3114（2007）04-21-4 |
| 修稿时间： | 2006-08-20 |
An Algorithm for Construction of IRA Codes Based on Gaussian Approximation |
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| YU Cong-mei,LEI Jing,WEN Lei.An Algorithm for Construction of IRA Codes Based on Gaussian Approximation[J].Radio Communications Technology,2007,33(4):21-24. |
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| Authors: | YU Cong-mei LEI Jing WEN Lei |
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| Abstract: | The structure of irregular repeat accumulate codes is introduced.We analyzed Tanner graph and parity check matrix of the IRA codes.The construction of IRA codes includes the optimization of degree distribution and the design of parity check matrix.For a given noise variance,the optimized degree sequences are deduced with Gaussian approximation in AWGN channels.Then design process of the parity check matrix is given.Simulations show that the IRA codes we designed have more good performance than the LDPC codes designed by computer search and the performance becomes better with the longer code length. |
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| Keywords: | irregular repeat accumulate codes LDPC codes Gaussian approximation degree distribution |
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