The effect of terrain on radio propagation in urban microcells

Lampard, G.; Vu-Dinh, T.

doi:10.1109/25.231883

Cited by 29 publications

(6 citation statements)

References 9 publications

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“…4. The height of the hill plus building height as a function of the distance from the peak of the hill is given by (4) where is the hill radius and is the distance that the center of curvature lies below the flat portion of the terrain.…”

Section: A Isolated Cylindrical Hillmentioning

confidence: 99%

“…Fig. 2 shows one model, whereby the hill is replaced by an absorbing knife edge [3] or a dielectric wedge [4]. In the absence of buildings on top of the hill, the blockage may be modeled as a circular diffracting cylinder, as in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…1. Shadowing by hills in the absence of buildings has been modeled using absorbing knife edges [3] or dielectric wedges [4], as shown in Fig. 2 or circular cylinders [5], [6], as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

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Effect of terrain on path loss in urban environments for wireless applications

Piazzi¹,

Bertoni²

1998

IEEE Trans. Antennas Propagat.

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Path-loss prediction algorithms for advanced wireless communication system planning have long considered the effect of electromagnetic propagation over buildings between the base station and subscriber. This phenomena is particularly important in residential areas, where the houses are typically a few stories high. For the most part, the buildings were assumed to lie on level terrain, although shadowing effects by terrain in the absence of buildings has been included. Previous works have offered a number of methods to quantitatively determine these effects from path profiles. This study examines propagation over buildings when the buildings are located on terrain features (hills). The buildings, which are represented by a series of absorbing half screens, are assumed to lie in rows that are equally spaced along parallel streets, with the streets running perpendicular to the terrain slope. Numerical results are obtained using successive repetition of the Kirchhoff-Huygens approximation. A phenomenological model based on ray optics for diffraction over a smooth surface is proposed as a way to interpret the numerical results. The dependence of model coefficients on terrain parameters are obtained from the numerical results.

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Section: A Isolated Cylindrical Hillmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of terrain on path loss in urban environments for wireless applications

Piazzi¹,

Bertoni²

1998

IEEE Trans. Antennas Propagat.

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“…The ray-tracing method [4,5,6] and the FDTD (Finite-Difference Time-Domain) method [7,8] have been used for evaluating the propagation characteristics. Since the ray-tracing method is based on geometric optics theory, structures with a lot of detail cause an excessive increase in computation time or inadequate analysis accuracy.…”

Section: Introductionmentioning

confidence: 99%

Fast MIMO channel calculation technique for multi-antenna system using spread spectrum technique for FDTD method

2014

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In this letter, we present a new method that combines the spectrum spreading technique and FDTD (Finite-Difference Time-Domain) simulation for reducing the computation time in multipleantenna analysis. In this method, signals for the multiple antennas are generated by multiplying non-identical spreading codes, and multiple antennas are excited at the same time. This approach means that only a single FDTD simulation is needed whereas the conventional method needs as many simulations as there are transmitting antennas. A 2×2 multiple-antenna is simulated by way of a demonstration and it is found that the results of the proposed method agree well with those of the conventional method even though its computation time is shorter than that of the conventional method.

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“…In recent decades the wireless communication network has been developed to satisfy a continually increasing demand for personal, local, and mobile communications [Tadiran Telecommunication, 1993]. The prediction of propagation characteristics has become an essential part of radio wireless network planning [Reudink, 1972;Black and Reudink, 1972;Hata, 1980;Hughes, 1982;Chia et al, 1987;Steele, 1989;Harley, 1989;Rustako et al, 1989Rustako et al, , 1991Green, 1990;Chia, 1990;Levy, 1991;Ikegami et al, 1991;Milsrein et al, 1992;Lampard and Vu-Dinh, 1993;Tan and Tan, 1993, 1995. To develop such wireless systems successfully, it is very important to investigate .1 i , ",' 1 At the same time, it has been observed that the buildings lining streets work as waveguides, affecting the propagation direction of the radio waves [Black and Reudink, 1972].…”

Section: Introductionmentioning

confidence: 99%