Wireless Propagation in Non Line of Sight Urban Areas using Uniform Theory of Diffraction
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Wireless Propagation in Non Line of Sight Urban Areas using Uniform Theory of DiffractionAbstract
This paper describes a three-dimensional electromagnetic propagation model for signal power prediction in a non line of sight urban area located in Singapore. The model, which is implemented using the Ohio State NEC-BSC V4.2 basic scattering code and is based on ray theory and uniform theory of diffraction (UTD) takes into account first, second, and third order effects including triple reflections and diffractions. The simplified propagation model of Raffles Place, the central business district of Singapore, uses more than 360 geometrical structures and is compared with data measured at 937.6 MHz along a drive route at the site. The results from the propagation model produced reasonable agreement with the measurements showing that a simplified model using UTD can be used to simulate the gross features of electromagnetic scatter in an urban area. It is shown that use of penetrable dielectric building walls are also necessary for accurate prediction of radio wave propagation in urban areas under non line of sight conditions. It is also found that third order scattering effects can be dominant in non line of sight situations and may be necessary for accurate predictions.
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References
F. Ikegami, T. Takeuchi, S. Yoshida,
“Theoretical prediction of mean field
strength for urban mobile radio”, IEEE
Trans. on Ant. and Prop. Vol. 39, No. 3,
pp. 299-302, March 1991.
J. P. Rossi, J.C. Bic, A. J. Levy, Y.
Gabillet, M. Rosen, “ A ray launching
method for radio-mobile propagation in
urban area”, IEEE Ant. and Prop. Symp.,
Vol. 3, pp. 1540-1543, June 1991.
N. Blaunstein, M. Levin, “Propagation
Loss in the Urban Environment with
Rectangular Grid-Plan Streets”, 10 th
International Conference on Antennas
and Propagation, pp. 2.178-2.181, 14-17
April 1997.
N. Blaunstein, R. Giladi, and M. Levin,
“Characteristics’ Prediction in Urban and
Suburban Environments”, IEEE Trans.
Veh. Tech., Vol. 47, No. 1., pp. 225-234,
Feb. 1998.
S. Y. Tan, H. S. Tan, “ Propagation
model for microcellular communications
applied to path loss measurements in
Ottawa city streets”, IEEE Trans. on Veh.
Tech., Vol. 44, No.2, pp. 313- 317, May
J. Schuster and R. Luebbers, “Comparison
of GTD and FDTD Predictions for UHF
Radio Wave Propagation in a Simple
Outdoor Urban Environment,” IEEE APS
Int. Symp. Dig., Montreal, Canada, Vol. 3.
pp. 2022-2025, July 1997.
R. J. Marhefka, J.W. Silvestro, “Near-
zone basic scattering code, User’s manual
with space station applications” Technical
Report 716199-13, March 1989.
M. F. Catedra, J. Perez, F. Saez de Adana,
and O. Gutierrez, “Efficient ray-tracing
techniques for three-dimensional analyses
of propagation in mobile ommunications:
application to picocell and microcell
scenarios”, IEEE Antennas and Prop.
Magazine, Vol. 40, No. 2, pp. 15-28,
April 1998.
S-C Kim, B. J. Guarino Jr., T. M. Willis
III, V. Erceg, S. J. Fortune, R. A.
Valenzuela, L. W. Thomas, J. Ling, and J.
D. Moore, ”Radio propagation
measurements and prediction using three-
dimensional ray tracing in urban
environments at 908MHz and 1.9GHz”,
IEEE Trans. on Veh. Tech., Vol. 48, No.
, pp. 931- 946, May 1999.
O. Landron, M. J. Feuerstein, and T. S.
Rappaport, “In Situ Microwave Reflection
Coefficient Measurements for Smooth and
Rough Exterior Wall Surfaces”, in Proc.
rd IEEE Veh. Technol. Conf., pp. 77- 80,
A. M. D. Turmani, A. F. de Toledo,
“Modeling of radio transmissions into and
within multistory buildings at 900, 1800,
and 2300 MHz”, IEE Proc. I, 140, (6), pp.
-470, 1993
