MAIN ALGORITHM OF RADIO COVERAGE (RADIO MAP) DESIGN in .NET

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FIGURE 11.31. Topographic plan of Ben Gurion university campuses.
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Two sectoral antennas, with three sectors 52, 408, and 400, arranged only according to preliminary experiments, cover an area of the university and together give the pure coverage of radiated energy (see Fig. 11.32). Results presented in Figure 11.32 show that the three sectors cannot fully cover the university s
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FIGURE 11.32. Radio coverage of two sectoral antennas, numbered 52 and 400, and shown in Fig. 11.31.
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campuses, and more than 40% of the area of service are in shadow zones. Therefore, an effective service of subscribers cannot be achieved in more than 40% of the university area. Therefore, we proposed another arrangement of three sectoral antennas, on the basis of our stochastic approach and the corresponding algorithm described in 10, according to which speci c tilts and heights of two sectoral antennas, and power distribution within each sector, were found according to strict analysis of topographic map of the university area. Now, using the same three more strictly assembled sectors, according to the theoretical prediction, based only on topography of the tested area and the data of antennas, more than 90% of radio coverage was obtained (see Fig. 11.33) to allow each subscriber located in the university area a stable and effective radio service. We notice that because the obtained data corresponds to the technical requirements of our customers, we cannot present here full information about our derivations according to proposed algorithm. The result is evident: about 93% of the university area is now covered. The corresponding decrease of the overall loss is now about 30 40 dBm compared with that obtained by the use of three nonarranged sectoral antennas (see Fig. 11.32). This example shows that using the proposed theoretical algorithm on how to predict link budget for various built-up areas, described for different scenarios occurred in the urban scene, each designer of cellular networks can achieve the effective arrangement of antennas in such a manner to give full radio coverage to the area of service with minimum path loss for the corresponding users located in this area.
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FIGURE 11.33. Radio coverage of three sectoral antennas, numbered 52, 400 and 408, according to the theoretical prediction of their new parameters.
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[1] Anderson, H. R., A ray-tracing propagation model for digital broadcast systems in urban areas, IEEE Trans. on Broadcasting, vol. 39, no. 3, 1993, pp. 309 317; Trans. Select. Areas in Communic., vol. 10, no. 4, 1992, pp. 665 668. [2] Bertoni, H. L., Radio Propagation for Mobile Wireless Systems, Prentice Hall PTR, New Jersey, 2000. [3] Bertoni, H. L., P. Pongsilamanee, C. Cheon, and G. Liang, Sources and statistics of multipath arrival at elevated base station antenna, Proc. IEEE Veh. Technol. Conference, vol. 1, Houston, Texas, 1999, pp. 581 585. [4] Liang, G., and H. L. Bertoni, A new approach to 3D ray tracing for propagation prediction in cities, IEEE Trans. Anten. Propagat., vol. 46, 1998, pp. 853 863. [5] Lebherz, M., W. Weisbeck, and K. Krank, A versatile wave propagation model for the VHF/UHF range considering three dimensional terrain, IEEE Trans. Antennas Propagat., vol. AP-40, 1992, pp. 1121 1131. [6] Lee, W. Y. C., Mobile Communication Engineering, McGraw Hill, New York, 1985. [7] Kouyoumjian, R. G., and P. H. Pathak, A uniform geometrical theory of diffraction for an edge in a perfectly conducting surface, Proc. IEEE, vol. 62, no. 9, 1974, pp. 1448 1469. [8] L. E. Vogler, An attenuation function for multiple knife-edge diffraction, Radio Sci., vol. 19, no. 8, 1982, pp. 1541 1546. [9] Wal sch, J., and H. L. Bertoni, A theoretical model of UHF propagation in urban environments, IEEE Trans. Antennas Propagat., vol. AP-38, 1988, pp. 1788 1796. [10] Xia, H. H., and H. L. Bertoni, Diffraction of cylindrical and plane waves by an array of absorbing half screens, IEEE Trans. Antennas and Propagation, vol. 40, 1992, pp. 170 177. [11] Bertoni, H. L., W. Honcharenko, L. R. Maciel, et al., UHF propagation prediction for wireless personal communications, Proc. IEEE, vol. 82, no. 9, Sept. 1994, pp. 1333 1359. [12] Rustako, A. J. Jr., N. Amitay, M. J. Owens, et al., Radio propagation at microwave frequencies for line-of-sight microcellular mobile and personal communications, IEEE Trans. Veh. Technol., vol. 40, no. 2, February 1991, pp. 203 210. [13] Tan, S. Y., and H. S. Tan, UTD propagation model in an urban street scene for microcellular communications, IEEE Trans. Electromag. Compat., vol. 35, no. 4, November 1993, pp. 423 428. [14] Ponomarev, G. A., A. N. Kulikov, and E. D. Telpukhovsky, Propagation of Ultra-Short Waves in Urban Environments, Tomsk, Rasko, Russia, 1991. [15] Blaunstein, N., and M. Levin, VHF/UHF wave attenuation in a city with regularly spaced buildings, Radio Sci., vol. 31, no. 2, 1996, pp. 313 323. [16] Blaunstein, N., and M. Levin, Propagation loss prediction in the urban environment with rectangular grid-plan streets, Radio Sci., vol. 32, no. 2, 1997, pp. 453 467. [17] Blaunstein, N., Wireless Communication Systems, in Handbook of Engineering Electromagnetics, ed. R. Bansal, chap. 12 Marcel Dekker, New York, 2004, pp. 417 481. [18] Blaunstein, N., Average eld attenuation in the non-regular impedance street waveguide, IEEE Trans. Anten. and Propagat., vol. 46, no. 12, 1998, pp. 1782 1789.
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