| 多径衰落信道的分数布朗运动模型 |
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| 引用本文： | 童治,陶锋,魏淮,王目光,王智,简水生.多径衰落信道的分数布朗运动模型[J].电子学报,2003,31(1):89-91. |
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| 作者姓名： | 童治 陶锋 魏淮 王目光 王智 简水生 |
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| 作者单位： | 西安交通大学电子与信息工程学院,陕西西安 710049 |
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| 基金项目： | 国家“863”计划资助项目 (No.863 31 7 0 2 0 4 99) |
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| 摘 要： | 本文旨在将分形理论引入多径衰落信道的研究,从非线性科学的角度出发建立了多径信道的分数布朗运动模型.通过探讨多径信号的增量统计分布、统计自相似性、广义功率谱和分形维数,揭示了多径衰落与分数布朗运动间的内在联系;指出信号的分维是描述无线信道传播特性的重要参数;在分形模型的基础上,对多径信号进行了重构.实验结果表明,无线信道的分数布朗运动模型比传统的随机模型能更有效地刻划和描述多径衰落的行为.
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| 关 键 词： | 多径衰落 信道模型 分数布朗运动 分形 |
| 文章编号： | 0372-2112(2003)01-0089-03 |
| 收稿时间： | 2001-07-30 |
Numerical Analysis of Coupling from Core Mode to Radiation Mode in Long Period Fiber Gratings |
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| TONG Zhi,TAO Feng,WEI Huai,WANG Mu guang,WANG Zhi,JIAN Shui sheng.Numerical Analysis of Coupling from Core Mode to Radiation Mode in Long Period Fiber Gratings[J].Acta Electronica Sinica,2003,31(1):89-91. |
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| Authors: | TONG Zhi TAO Feng WEI Huai WANG Mu guang WANG Zhi JIAN Shui sheng |
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| Affiliation: | School of Electronics and Information Engineering,Xi'an Jiaotong University,Xi'an,Shaanxi 710049,China |
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| Abstract: | In this paper we develop a complete model to simulate the properties of a long period fiber grating whose cladding index is lower than the ambient refractive index based on coupled mode theory and radiation mode theory,and we also present a new method to solve the radiation mode coupling equations numerically.The characteristics of coupling from core mode to radiation mode in a LPG is analysed,and the general rules are summarized,which agrees well with experimental results.In addition,this model can be easily applied to fiber Bragg gratings. |
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| Keywords: | long period fiber grating radiation mode leaky mode three layer step index waveguide |
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