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Ray-optical prediction of radio-wave propagation characteristics in tunnel environments-Part 2 : analysis and measurements

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Ray-optical prediction of radio-wave propagation characteristics in tunnel environments-Part 2 : analysis and measurements

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Title: Ray-optical prediction of radio-wave propagation characteristics in tunnel environments-Part 2 : analysis and measurements
Author: Zhang, Yue Ping; Hwang, Y.; Kouyoumjian, Robert G.
Copyright year: 1998
Abstract: The uniform theory of diffraction (UTD) developed in Part 1 is used to predict narrow- and wide-band propagation characteristics in tunnels at 900- and 1800-MHz frequencies. Narrow-band propagation characteristics is shown in spatial domain and wide-band propagation in time domain. In empty straight-tunnel environments, propagation exhibits a break-point phenomenon and has very short time delay spread. In empty curved or branched tunnel environments, propagation suffers higher loss. Vehicles cause additional propagation loss and larger varying time delay spread in tunnels. The measured results have validated the accuracy of the theoretical model and provided important information on narrow-band and wide-band propagation characteristics in empty, branched and obstructed tunnels.
Subject: DRNTU::Engineering::Electrical and electronic engineering::Optics, optoelectronics, photonics.
Type: Journal Article
Series/ Journal Title: IEEE transactions on antennas and propagation
School: School of Electrical and Electronic Engineering
Rights: IEEE Transactions on Antennas and Propagation © 1998 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. http://www.ieee.org/portal/site.
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