P. Danielle, V. DegliEsposti, G. Falciasecca, M. Frullone, G. J. Riva; "Evaluation of the Reliability of a Ray--Tracing Microcellular Field Prediction Model"; Progress in Electromagnetic Research Sym-- posium (PIERS) 1996, Innsbruck, Austria.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....reduced to a number of about 5, cutting down computation time significantly without affecting accuracy to a great extent. A A Fig. 1: Reduction of data base complexity B. Influence of the data base There are many papers dealing with the influence of the data base on the prediction results [2] [8]. All of them point out that relatively small changes in the positions of corners can produce errors of more than 5. 10 dB. So it should be mentioned that a high accuracy of the data base is necessary to get very accurate predictions. On the other side, it is generally not possible to get ....

....topic for a fast ray tracing prediction tool. If only the dominantrays are considered, the error will be very small (less than 2 . 5 dB) and the computation of the field strength is very fast. This error due pared to the error due to wrong informations in the data base (see section II and [2] [8]) Three different approaches are presented in this paper to determine the dominantrays only. All of them were implemented in our microcellular prediction tool and so their acceleration efficiency and their accuracy can be compared to each other in the following sections. A. Fresnel zone The ....

P. Danielle, V. Degli-Esposti, G. Falciasecca, M. Frullone, G. J. Riva: "Evaluation of the Reliability of a Ray--Tracing Microcellular Field Prediction Model", Progress in Electromagnetic ResearchSym-- posium (PIERS) 1996, Innsbruck, Austria, p. 513 794

.... One of the main disadvantages of the ray optical models is their dependency on the accuracy of the data base [5] 6] If the material of a wall is not accurately defined [11] or if the location of a wall differs from the actual location, the prediction leads to different and wrong results [12]. III. MEASUREMENTS For the validation of a prediction model, many measurements in different types of buildings are necessary. Modern office buildings are important as well as old buildings with furniture. Measurement campaigns in different types of buildings were used for the validation of the ....

P. Danielle, V. Degli-Esposti, and G. J. R. G. Falciasecca, M. Frullone, "Evaluation of the Reliability of a Ray Tracing Microcellular Field Prediction Model," in Progress in Electromagnetics Research Symposium (PIERS), (Innsbruck, Austria), p. 513, July 1996.

....figure 2. If the positions of the walls flF and flG are not known exactly (they may vary in the grey shadowed area) some of the determined rays do not reach the receiver R 1 . In most data bases the positions of the walls are not known as precisely as they should be for a ray tracing algorithm [10]. So a new approach for the prediction of the field strength should not rely on the knowledge of all possible rays between a transmitter and a receiver. Only the representative paths should be determined and they should be independent of the accuracy of the data base and of the time variant ....

P. Danielle, V. Degli-Esposti, F. Falciasecca, M. Frullone, and G. J. Riva, "Evaluation of the reliability of a ray tracing microcellular field prediction model," in Progress in Electromagnetics Research Symposium (PIERS) 1996, Innsbruck, Austria, p. 513, Jul. 1996.

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P. Danielle, V. DegliEsposti, G. Falciasecca, M. Frullone, G. J. Riva; "Evaluation of the Reliability of a Ray--Tracing Microcellular Field Prediction Model"; Progress in Electromagnetic Research Sym-- posium (PIERS) 1996, Innsbruck, Austria.

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