Journal ArticleDOI
Physical optics and field-strength predictions for wireless systems
TLDR
A computer program of this type is most useful in situations in which the base station (BS) antenna is above local clutter, and over areas large enough that ground cover can be characterized with categories such as "open," "forest," "dense residential," etc., rather than individual buildings.Abstract:Â
Physical optics, or Fresnel-Kirchhoff theory, is often used for studies of particular problems in terrestrial radio-wave propagation. With efficient techniques of numerical integration, it can also be used effectively for routine predictions and for designing terrestrial wireless systems. A computer program of this type has been in use for several years. It is most useful in situations in which the base station (BS) antenna is above local clutter, and over areas large enough that ground cover can be characterized with categories such as "open," "forest," "dense residential," etc., rather than individual buildings. The main calculation is a marching algorithm that simulates diffraction over all the variations in terrain height along radials from the BS. A secondary calculation estimates the additional attenuation due to buildings and trees close to the mobile antenna. This part of the calculation is based on several parameters characterizing the local environment of the mobile antenna. Calculations are slow compared to many traditional methods, but are fast enough for routine use on a PC.read more
Citations
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Journal ArticleDOI
Blockage and directivity in 60 GHz wireless personal area networks: from cross-layer model to multihop MAC design
TL;DR: A diffraction-based model to determine network link connectivity as a function of the locations of stationary and moving obstacles is developed and it is shown that multihop communication, with the introduction of a small number of relay nodes, is effective in maintaining network connectivity in scenarios where single-hop communication would suffer unacceptable outages.
Journal ArticleDOI
A Survey of Wireless Path Loss Prediction and Coverage Mapping Methods
TL;DR: A new taxonomy for reasoning about the similarities and differences of the many approaches is provided and a brief but complete overview of the various methods is provided as well as describing insights into future directions for research in this area.
Journal ArticleDOI
Propagation Over Clutter: Physical Stochastic Model
TL;DR: In this article, the propagation of radio signals from a base above clutter, such as buildings and trees, to a mobile immersed in clutter is treated theoretically by accounting for random diffuse scattering at the mobile.
Proceedings ArticleDOI
Propagation over Clutter: Physical Stochastic Model
Dmitry Chizhik,Jonathan Ling +1 more
TL;DR: Propagation of radio signals from a base above clutter to a mobile immersed in clutter is treated theoretically by accounting for random diffuse scattering at the mobile, and closed form expressions are derived for path gain and at the base in both urban and heavily foliated environments.
Journal ArticleDOI
A Kirchhoff Integral approach to estimating propagation in an environment with nonhomogeneous atmosphere and complex boundaries
TL;DR: In this article, it has been shown that the approach can also yield accurate estimates when refractive effects, such as atmospheric ducting, are present, which can be used for terrestrial radio wave propagation.
References
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Book
The scattering of electromagnetic waves from rough surfaces
Petr Beckmann,Andre Spizzichino +1 more
TL;DR: The scattering of electromagnetic waves from rough surfaces PDF is available at the online library of the University of Southern California as mentioned in this paper, where a complete collection of electromagnetic wave from rough surface books can be found.
Journal ArticleDOI
A theoretical model of UHF propagation in urban environments
J. Walfisch,Henry L. Bertoni +1 more
TL;DR: In this paper, the authors developed a model in which the rows or blocks of buildings are viewed as diffracting cylinders lying on the earth, and the propagation process reduces to multiple forward diffraction past a series of screens.
Book
Parabolic Equation Methods for Electromagnetic Wave Propagation
TL;DR: In this paper, the authors present the application of parabolic equation methods in electromagnetic wave propagation and describe simple parabolic equations for domain truncation, the treatment of impedance boundaries and the implementation of very fast hybrid methods combining ray-tracing and paraboloid equation techniques.
Journal ArticleDOI
Concepts and results for 3D digital terrain-based wave propagation models: an overview
TL;DR: Wave interactions, like diffraction and scattering, over the propagation path are described by the uniform theory of diffraction (UTD) and physical optics (PO) and models for rural and urban areas are presented for 2-D and 3-D ray tracing.