Comparative Study of Lateral Profile Knife-Edge Diffraction and Ray Tracing Technique Using GTD in Urban Environment

Hatem Mokhtari, Pavlos Lazaridis

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

In an urban environment, radio-wave interaction with buildings may affect considerably the propagation of radio waves, mainly because of multipath, diffraction, and shadowing effects. This paper outlines the effect of two-dimensional (2-D) (vertical and lateral) diffraction and compares a Fresnel-Kirchhoff scalar approach to a vectorial geometrical theory of diffraction (GTD) approach applied to a four-ray system. The former can be considered as a generalization of conventional knife-edge diffraction theory while the latter (GTD) is useful in the context of ray tracing. A very good agreement between the Fresnel-Kirchhoff and GTD results is found within the limits of validity of both methods. Moreover, it is shown that conventional knife-edge diffraction theory can largely overestimate attenuation (10-15 dB) behind tall buildings in the center of a city environment. Different frequency bands have been tested for the sake of comparison, and emphasis has been put on the radio communications frequency bands used for the global system for mobile communications (GSM) and DCS/DECT systems at 900 and 1800 MHz.

LanguageEnglish
Pages255-261
Number of pages7
JournalIEEE Transactions on Vehicular Technology
Volume48
Issue number1
DOIs
Publication statusPublished - Jan 1999
Externally publishedYes

Fingerprint

Ray Tracing
Ray tracing
Comparative Study
Diffraction
Lateral
Diffraction Theory
Radio waves
Frequency bands
Wave Interaction
Shadowing
Mobile Communication
Cordless telephones
Multipath
Attenuation
Half line
Tall buildings
Radio communication
Global system for mobile communications
Vertical
Profile

Cite this

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title = "Comparative Study of Lateral Profile Knife-Edge Diffraction and Ray Tracing Technique Using GTD in Urban Environment",
abstract = "In an urban environment, radio-wave interaction with buildings may affect considerably the propagation of radio waves, mainly because of multipath, diffraction, and shadowing effects. This paper outlines the effect of two-dimensional (2-D) (vertical and lateral) diffraction and compares a Fresnel-Kirchhoff scalar approach to a vectorial geometrical theory of diffraction (GTD) approach applied to a four-ray system. The former can be considered as a generalization of conventional knife-edge diffraction theory while the latter (GTD) is useful in the context of ray tracing. A very good agreement between the Fresnel-Kirchhoff and GTD results is found within the limits of validity of both methods. Moreover, it is shown that conventional knife-edge diffraction theory can largely overestimate attenuation (10-15 dB) behind tall buildings in the center of a city environment. Different frequency bands have been tested for the sake of comparison, and emphasis has been put on the radio communications frequency bands used for the global system for mobile communications (GSM) and DCS/DECT systems at 900 and 1800 MHz.",
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AB - In an urban environment, radio-wave interaction with buildings may affect considerably the propagation of radio waves, mainly because of multipath, diffraction, and shadowing effects. This paper outlines the effect of two-dimensional (2-D) (vertical and lateral) diffraction and compares a Fresnel-Kirchhoff scalar approach to a vectorial geometrical theory of diffraction (GTD) approach applied to a four-ray system. The former can be considered as a generalization of conventional knife-edge diffraction theory while the latter (GTD) is useful in the context of ray tracing. A very good agreement between the Fresnel-Kirchhoff and GTD results is found within the limits of validity of both methods. Moreover, it is shown that conventional knife-edge diffraction theory can largely overestimate attenuation (10-15 dB) behind tall buildings in the center of a city environment. Different frequency bands have been tested for the sake of comparison, and emphasis has been put on the radio communications frequency bands used for the global system for mobile communications (GSM) and DCS/DECT systems at 900 and 1800 MHz.

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KW - Cellular radio

KW - Electromagnetic wave diffraction

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KW - Fresnel integral

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KW - Knife edge

KW - Land mobile radio

KW - Microcell coverage prediction

KW - Path loss

KW - Radiowave propagation

KW - Radiowave propagation model

KW - Ray tracing

KW - 2-D Fresnel–Kirchhoff diffraction

KW - 2-D ray tracing

KW - Urban environment

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