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Time/frequency dispersion of digital transmission media: Wideband wireless channel, chiral optical fiber, and superconducting MMIC.

机译：数字传输介质的时间/频率色散：宽带无线通道，手性光纤和超导MMIC。

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摘要

The development of advanced high-speed broadband networks and wireless systems requires a deeper understanding on the dispersion of transmission media. The purpose of this dissertation is to understand the time/frequency dispersion in guided and unguided dispersive media from RF frequency to optical frequency. Specifically, the dissertation studies three dispersive media: wideband wireless channel, chiral optical fiber, and superconducting MMICs.; We have made a trade-off between the stochastic simulation model and the deterministic prediction model and suggested a novel wideband discrete model by incorporating the site-specific information (frequency dependence of the individual rays). It is found from simulation that the frequency dependency can be used to trace, detect, and characterize a ray path, and further useful for wideband wireless channel modeling. A novel super-resolution technique named the Eigen-Matrix Pencil Method has been characterized and used to detect the paths in the multipath environments.; We have proposed a novel hybrid full-wave analysis based on the Complex Resistive Boundary Condition and Varitional Principle to model the superconducting MMICs. This hybrid approach using an appropriate "variational average" of two bounds has been proven more accurate than the conventional approach. We have developed a formulation of the pulse propagation in the MMICs for both normal conductor and superconductor structures. Our method has several advantages over traditional methods. Closed-form formulae suitable for CAD use have been derived.; A novel optical fiber relying on the chirality of materials is proposed. We have studied the theoretical formulation and new features of the novel chiral fiber. Adding chirality to the optical fiber leads to unique features and can efficiently and conveniently modify fiber properties. Using the step-index chiral fiber as an example, we found that chirality has a great effect on the propagation constant, the effective group index, the waveguide dispersion, and pulse propagation. Chirality might be used to improve and control the fiber dispersion property so as to enhance the data rate or channel capacity. Numerical examples are shown.
机译：先进的高速宽带网络和无线系统的发展需要对传输介质的分散性有更深入的了解。本文的目的是了解从射频频率到光频率的导引和非导引色散介质中的时间/频率色散。具体而言，本文研究了三种色散介质：宽带无线信道，手性光纤和超导MMIC。我们在随机模拟模型和确定性预测模型之间进行了权衡，并通过结合特定地点的信息（各个射线的频率依赖性）提出了一种新颖的宽带离散模型。从仿真中发现，频率相关性可用于跟踪，检测和表征射线路径，对于宽带无线信道建模更有用。一种名为本征矩阵笔法的新颖超分辨率技术已被表征并用于检测多径环境中的路径。我们提出了一种基于复合电阻边界条件和变分原理的新型混合全波分析，以对超导MMIC进行建模。已经证明，使用两个边界的适当“变异平均值”的这种混合方法比常规方法更准确。我们已经为普通导体和超导体结构开发了MMIC中脉冲传播的公式。与传统方法相比，我们的方法具有多个优点。得出了适用于CAD的闭式公式。提出了一种依靠材料手性的新型光纤。我们研究了新型手性纤维的理论配方和新特性。将手性添加到光纤中会导致独特的功能，并且可以高效方便地修改光纤的特性。以阶跃折射率手性光纤为例，我们发现手性对传输常数，有效基团折射率，波导色散和脉冲传输有很大的影响。手性可用于改善和控制纤维的色散特性，从而提高数据速率或通道容量。显示了数值示例。

著录项

  • 作者

    Qiu, Robert Caiming.;

  • 作者单位

    Polytechnic University.;

  • 授予单位 Polytechnic University.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 1996
  • 页码 193 p.
  • 总页数 193
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
  • 关键词

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