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A microcellular ray-tracing propagation model and evaluation of its narrow-band and wide-band predictions

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)322 - 335
Number of pages14
JournalIEEE Journal on Selected Areas of Communications
Journal issue3
StatePublished - Mar 2000


Due to the site specific nature of microcellular operational environments, propagation models are required to take into account the exact position, orientation and electrical properties of individual buildings, and hence, ray-tracing techniques have emerged as the dominant methods to predict propagation in such environments. A novel hybrid three-dimensional (3-D) ray-tracing algorithm which can evaluate scenarios incorporating many thousands of objects by utilising the concept of “illumination zones,” is presented. In order to evaluate the accuracy of the presented model, comparisons of narrow-band and wide-band predictions with measurements are performed for a variety of scenarios. First, power comparisons show that very accurate predictions can be achieved (RMS errors less than 3.7 dB). Then, wide-band analysis shows that since the RMS delay spread for systems with finite bandwidth is a function of the multipath phase, only average measured and predicted RMS delay spread values can be compared and as a result, limited averaging can produce large RMS errors. With sufficient averaging the achieved wide-band accuracy in terms of the predicted RMS delay spread, is adequate for most planning purposes.

Additional information

Publisher: Institute of Electrical and Electronics Engineers, Inc. (IEEE) Rose publication type: Journal article Terms of use: Copyright © 2000 IEEE. Reprinted from IEEE Journal on Selected Areas in Communications. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of the University of Bristol's products or services. Internal or 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 must be obtained from the IEEE by writing to By choosing to view this document, you agree to all provisions of the copyright laws protecting it.

Research areas

  • microcellular radio, multipath channels, ray tracing, UHF radio propagation

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