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Spatial modeling of three-dimensional multipath wireless channels.

机译：三维多径无线信道的空间建模。

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摘要

he wireless communication channel is charactarized by multipath propagation mechanism due to scattering by objects surrounding the communicating nodes. Unmitigated multipath propagation can be harmful due to the introduced distortion by superimposing multiple signal replicas. On the other hand, the multipath propagation can be beneficial in providing implicit diversity, as the propagation paths can be used as multiple communication channels.;This dissertation thesis presents a simple method for spatial modeling of narrowband multipath channels. It presents results that have stemmed from a new approach in channel characterization - deriving the second-order fading statistics like level-crossing rate, average fade duration, and coherence distance and time from the multipath angular power distribution (APD) at the receiver antenna. First, a new method is presented for characterizing the three-dimensional angular spread of the received multipath in terms of the zeroth- and first-degree spherical harmonic coefficients of the APD, and the dependence of the average spatial correlation of the received signal envelope on that angular spread is derived. Second, the derivation of the average second-order fading channel statistics in terms of the angular spread is extended for characterizing the angular variability of the second-order fading statistics in a local area and local volume. This characterization is obtained in terms of the so-called three-dimensional multipath shape factors - an extension of an earlier work on horizontal propagation. The multipath shape factors in this work are defined in terms of the zeroth-, first- and second-degree spherical harmonic coefficients of the APD. Third, the shape factor theory has been extended for modeling mobile-to-mobile multipath channels through the joint APD at both wireless link ends. For this purpose, joint multipath shape factors have been defined in terms of the double Fourier coefficients of the joint biazimuthal APD for the two-dimensional model, or the double spherical harmonic coefficients of the joint bispherical APD for the three-dimensional model.
机译：由于通信节点周围物体的散射，无线通信信道具有多路径传播机制的特征。由于叠加了多个信号副本而导致的失真，未缓解的多径传播可能是有害的。另一方面，由于传播路径可以用作多个通信信道，因此多径传播可以提供隐式分集。（2）本文为窄带多径信道的空间建模提供了一种简单的方法。它提供了来自信道表征新方法的结果-从接收机天线的多径角功率分布（APD）推导出二阶衰落统计数据，例如电平交叉速率，平均衰落持续时间以及相干距离和时间。首先，提出了一种新方法，用于根据APD的零度和一度球谐系数来表征接收到的多径的三维角展度，以及接收信号包络的平均空间相关性对得出角展度。其次，扩展了根据角展度的平均二阶衰落信道统计量的推导，以表征局部区域和局部体积中的二阶衰落统计量的角度可变性。这种表征是根据所谓的三维多径形状因数获得的，它是对水平传播的早期工作的扩展。这项工作中的多径形状因子是根据APD的零度，一度和二度球谐系数定义的。第三，形状因数理论已经扩展到通过两个无线链路两端的联合APD对移动到移动多径信道进行建模。为此，已经针对二维模型根据关节双方位APD的双傅立叶系数，或者针对三维模型对关节双球APD的双球谐系数定义了关节多径形状因子。

著录项

  • 作者

    Valchev, Dimitar Georgiev.;

  • 作者单位

    Northeastern University.;

  • 授予单位 Northeastern University.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2008
  • 页码 143 p.
  • 总页数 143
  • 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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