High-frequency methods for multiple diffraction modeling: application and comparison

Polka, L.A.; Balanis, C.A.; Polycarpou, Anastasis C.

doi:10.1163/156939394x01019

Cited by 9 publications

(6 citation statements)

References 16 publications

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“…The procedure followed when multiple reflection-diffraction terms are calculated is very similar to the one outlined in the previous sections and, due to space limitations, the derivations will be omitted in this paper. As reported by Polka et al [9], terms higher than third-order are usually not necessary for accurate computations.…”

Section: The Diffracted Wavesmentioning

confidence: 93%

Propagation model for building blockage in satellite mobile communication systems

Tirkas

Wangsvick

Balanis

1998

IEEE Trans. Antennas Propagat.

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A propagation model for building blockage in satellite mobile communication systems is developed. This model characterizes the signal transmitted from a low-earth orbiting (LEO) satellite when there is an obstruction in the path of the signal. The obstruction is assumed to be a man-made structure. The analysis is performed using the uniform theory of diffraction (UTD). Using this method, both single and double diffractions from the structure edges were included. Direct and reflected rays from the ground and building were also included, whenever the satellite signal was not completely obstructed. The satellite is assumed to be moving along a circular orbit while the receiver is stationary. The normalized signal level (in decibels) and the signal attenuation rate (in decibels per second) are computed. Such information is considered very useful in developing the mobile system's hand-off algorithm.Index Terms-Geometrical theory of diffraction, satellite mobile communication.

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Section: The Diffracted Wavesmentioning

confidence: 93%

Propagation model for building blockage in satellite mobile communication systems

Tirkas

Wangsvick

Balanis

1998

IEEE Trans. Antennas Propagat.

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“…3 t; ! 1 = !2; !3 !1; jX1 + X2 + X3j < T=2 (12) where X1 and !1 are the normalized amplitude and frequency of the small desired signal, X 2 and ! 2 are the normalized amplitude and frequency of the large interferer, and X3 and !3 are the normalized amplitude and frequency of the small interfering signal.…”

Section: B Desensitization Due To Mixingmentioning

confidence: 99%

“…56-60, 1991. [12] , "A simple algorithm for fitting measured data to Fourier-series models," Int. J.…”

Section: Appendixmentioning

confidence: 99%

“…Using these parameters calculations show that the proposed model accurately represents the normalized current/voltage characteristics of the bipolar and MOSFET differential amplifiers [10], [11]. However, higher accuracies can be obtained, if required, using the procedure described in [7] and [12]. One of the applications intended for the Fourier series representation of (3) is to enable the prediction of the desensitization performance of the bipolar and MOSFET differential amplifiers when the input comprises a number of desired and undesired signals.…”

Section: Introductionmentioning

confidence: 99%

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Blocking and desensitization in bipolar and MOSFET differential amplifiers

Abuelma’atti

1999

IEEE Trans. Electromagn. Compat.

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“…Geometrical Optics (GO) combined with the Uniform Theory of Diffraction (UTD) is one of the most extensive deterministic techniques for high frequency electromagnetic analysis [1][2][3] in a number of applications, such as propagation in mobile communications, radiation of on board antennas, and others [4][5][6]. The main difficulty in GO/UTD is the ray-tracing calculation, especially when analyzing a complex environment [7,8].…”

Section: Introductionmentioning

confidence: 99%

Application of the Particle Swarm Optimization to the Computation of the Go/Utd Reflection Points Over Nurbs Surfaces

Gutiérrez¹,

Adana²,

Valiente³

2012

PIER Letters

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Abstract-A new method to find the Geometrical Optics/Uniform Theory of Diffraction reflection points over Non Uniform Rational BSplines surfaces is presented. The approach is based on the Particle Swarm Optimization (PSO) technique, and the cost function used to find the reflection points is based on Snell's law. The technique can be used as an alternative to classic minimization techniques in cases where convergence problems arise.

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High-frequency methods for multiple diffraction modeling: application and comparison

Cited by 9 publications

References 16 publications

Propagation model for building blockage in satellite mobile communication systems

Propagation model for building blockage in satellite mobile communication systems

Blocking and desensitization in bipolar and MOSFET differential amplifiers

Application of the Particle Swarm Optimization to the Computation of the Go/Utd Reflection Points Over Nurbs Surfaces

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