| IRA码在混合信道上的高斯估计 |
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| 引用本文： | 高宏峰,许宗泽.IRA码在混合信道上的高斯估计[J].应用科学学报,2006,24(2):176-180. |
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| 作者姓名： | 高宏峰 许宗泽 |
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| 作者单位： | 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 |
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| 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.
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| 关 键 词： | 不规则重复累积码 高斯噪声 随机删除 高斯估计 |
| 文章编号： | 0255-8297（2006）02-0176-05 |
| 收稿时间： | 2004-05-19 |
| 修稿时间： | 2004-05-192005-03-18 |
Gaussian Approximation of Irregular Repeat-Accumulate Codes over Mixed Gaussian/Erasure Channels |
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| GAO Hong-feng,XU Zong-ze.Gaussian Approximation of Irregular Repeat-Accumulate Codes over Mixed Gaussian/Erasure Channels[J].Journal of Applied Sciences,2006,24(2):176-180. |
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| Authors: | GAO Hong-feng XU Zong-ze |
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| Institution: | 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 |
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| 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. |
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| Keywords: | irregular repeat-accumulate codes Gaussian approximation Gaussian noise random erasure |
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