| 一种AWGN信道下非规则LDPC码的优化方法 |
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| 引用本文： | 毛倩,董德存,曾小清.一种AWGN信道下非规则LDPC码的优化方法[J].计算机应用,2010,30(2):292-294. |
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| 作者姓名： | 毛倩 董德存 曾小清 |
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| 作者单位： | 1. 上海理工大学 光电学院 通信教研室2. 同济大学 |
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| 基金项目： | 国家863计划项目(2007AA11Z247) |
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| 摘 要： | 提出了一种加性高斯噪声（AWGN）信道下非规则低密度奇偶校验（LDPC）码的优化方法。利用LDPC码迭代译码算法下变量节点与校验节点的EXIT曲线之间的面积反映码的收敛阈值与香农限的差距这一特点，设计表示两条EXIT曲线之间面积的函数F，该函数可以衡量非规则LDPC码的性能，F值越小，LDPC码的收敛阈值就越接近香农限。仿真显示，合理设计变量节点和校验节点，减小函数F的值，能够提高非规则LDPC码的性能。
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| 关 键 词： | 低密度奇偶校验码 外部信息转换（EXIT）图 加性高斯白噪声 迭代译码 收敛阈值 |
| 收稿时间： | 2009-07-29 |
| 修稿时间： | 2009-09-21 |
Optimization method for irregular LDPC codes in AWGN channel |
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| MAO Qian,DONG De-cun,ZENG Xiao-qing.Optimization method for irregular LDPC codes in AWGN channel[J].journal of Computer Applications,2010,30(2):292-294. |
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| Authors: | MAO Qian DONG De-cun ZENG Xiao-qing |
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| Affiliation: | 1.College of Optical-Electro-Information and Computer Engineering/a>;University of Shanghai for Science and Technology/a>;Shanghai 200093/a>;China/a>;2.School of Transportation Engineering/a>;Tongji University/a>;Shanghai 200092/a>;China |
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| Abstract: | A method to optimize irregular Low-Density-Parity-Check(LDPC) codes was proposed.The area gap between the EXIT curves of variable-node decoder and check-nodes decoder of a LDPC code reflects a rate loss compared to Shannon limit,a function F which computed the area gap was designed to evaluate the performance of the irregular LDPC codes.The lower the value F is,the smaller the gap between the convergence threshold and the Shannon limit is.Simulation shows that the performance of irregular LDPC codes will be... |
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| Keywords: | Low-Density-Parity-Check (LDPC) code EXtrinsic Information Transfer (EXIT) chart Additive White Gaussian Noise (AWGN) iterative decoding convergence threshold |
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