Characterization of multipath parameters for line-of-sight microwave propagation

Parl, Steen A.

doi:10.1109/tap.1983.1143149

Cited by 18 publications

(7 citation statements)

References 14 publications

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“…There are some studies in the literature which focus on ray-tracing simulations to model wave propagation in atmospheric ducts. In [39], [40], ray-tracing analysis is performed to estimate delay in elevated ducts, but their models assume that only three rays can reach to the receiver. According to these papers, an 80-km link with elevated ducts shows a few nanosecond delay spread.…”

Section: B Ray-optics Methodsmentioning

confidence: 99%

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Channel Model for the Surface Ducts: Large-Scale Path-Loss, Delay Spread, and AOA

Dinc

Akan

2015

IEEE Trans. Antennas Propagat.

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Atmospheric ducts, which are caused by the rapid decrease in the refractive index of the lower atmosphere, can trap the propagating signals. The trapping effects of the atmospheric ducts can be utilized as a communication medium for beyondline-of-sight (b-LoS) links. Although the wave propagation and the refractivity estimation techniques for the atmospheric ducts are well studied, there is no work that provides a channel model for the atmospheric ducts. Therefore, we develop a large-scale path-loss model for the surface ducts based on the parabolic equation (PE) methods for the first time in the literature. In addition, we develop a ray-optics (RO) method to analyze the delay spread and angle-ofarrival (AOA) of the ducting channel with the surface ducts. Using the developed RO method, we derive an analytical expression for the effective trapping beamwidth of the transmitter to predict the ranges of the beamwidth that can be trapped by the surface ducts according to the refractivity and the channel parameters.

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Section: B Ray-optics Methodsmentioning

confidence: 99%

“…13 [39]. Therefore, the well-known Snell's equation for the stratified atmosphere is given as R 0 n(z) cos(θ) = (R 0 + ΔR)n(z + Δz) cos(θ − Δθ).…”

Section: Appendix a Derivation Of The Eikonal Equationmentioning

confidence: 99%

Channel Model for the Surface Ducts: Large-Scale Path-Loss, Delay Spread, and AOA

Dinc

Akan

2015

IEEE Trans. Antennas Propagat.

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“…The atmospheric refractivity models used with ray tracing are usually very simple and only give a rough approximation of the propagation channel behavior. These models generally assume one (or two) stable superrefractive layer superimposed on a standard atmospheric refractivity profile [Webster, 1982;Parl, 1983;Kheirallah et al, 1987;Marnhoud et al, 1987]. Even if these models do not allow one to explain all the observed radioelectrical phenomena [Claverie and Klapisz, 1985], it may be expected that they describe the basic features of the propagation channel.…”

Section: Introductionmentioning

confidence: 99%

Statistical characterization of line‐of‐sight microwave links

Rana¹,

Webster²,

Magne³

1992

Radio Science

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A ray tracing approach with a statistical model of the atmospheric refractivity is used to get angle-of-arrival, amplitude and delay time distributions in a multipath situation. The atmospheric model considers a single superrefractive layer. Statistics of the layer parameters (height, intensity, and thickness) are derived from meteorological data. Ray tracing calculations include rays reflected from a flat ground. The influence of the various layer parameters as well as the physical origin of the rays are analyzed and discussed. Some experimental evidence relating to, and confirming, the predicted values is also considered.

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“…Multipath propagation is caused by time-shifted multiple refracted and possibly reflected rays traveling in the stratified layers (in terms of radio reftactivity stratification) of the lower atmosphere. Most of the model studies have dealt with superrefractive multipath [Ruthroll, 1971;Pickering and DeRosa, 1979;Parl, 1983;Webster, 1983• Webster andScott, 1987]; others have dealt with subrefractive conditions [Dougherty, 1968] and surface reflection [Olsen et al, 1987]. A more thorough review was given by Stephansen [-1981] on line-of-sight radio propagation, and, more recently, by Rummler et al [1986] on multipath fading channel models for digital radio.…”

Section: Introductionmentioning

confidence: 99%

Dispersive microwave fading and lower atmospheric structure: An observational study

Lee¹

1989

Radio Science

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Simultaneous measurements of microwave fading and lower atmospheric conditions were carried out in Georgia in 1986 as a part of the continuing effort to study the line-of-sight digital radio performance. Acoustic sounding was a principal means of exploring the mechanism that causes dispersive fading. It was found that dispersive multipath fading occurs during nights with strong radiation inversion accompanied by a subsiding air mass. Subsidence inversion causes dispersion, and the origin of the air mass affects the mean received power level under multipath propagation conditions. When the height of the nocturnal boundary layer coincides with the height of the ground-based radiation inversion layer and is at 100-150 m, fading is heavy, active, and dispersive for a 57-km path with both transmitting and receiving antennae at 60 m above grade. Case studies of the significant episodes are presented, and the statistics of the different types of fading associated with the types of meteorological conditions are summarized for the 5-month study period. 133 134 LEE: MICROWAVE FADING AND ATMOSPHERE STRUCTURE FADING AND ATMOSPHERE STRUCTURE 139 Fig. 7. 400 300 200 100 ß ß ß / / 400 300 200 lOO LEE: MICROWAVE FADING AND ATMOSPHERE STRUCTURE radio systems as a function of path length and frequency, Bell Syst. Tech. J., 50(7), 2375-2398, 1971. Schiavone, J. A., Microwave radio meteorology: Diurnal fading distributions, Radio Sci., 17(5), 1301-1312, 1982. Sharpless, W. M., Measurements of the angle of arrival of microwaves, Proc. IRE, 34, 837-845, 1946. A review, Radio Sci., 16, 609-629, 1981. Tatarski, V. I., The Effect of the Turbulent Atmosphere on Wave Propagation, translated from Russian, 471 pp., Israel Program for Scientific Translations, Jerusalem, 1971. Vigants, A., Temporal variability of distance dependence of ampli-tude dispersion and fading, paper presented at ICC '84, Inst. of Electr. and Electron. Eng., Amsterdam, 1984. Webster, A. R., Angle-of-arrival and delay times on terrestrial line-of-sight microwave links, IEEE Trans. Antennas Propag., AP-31(1), 12-17, 1983. Webster, A. R., and A.M. Scott, Angles-of-arrival and tropospheric multipath microwave propagation, IEEE Trans. Antennas Propag., AP -35(1), 94-99, 1987. Stephansen, E. T., Clear air propagation on line-of-sight radio paths:

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Characterization of multipath parameters for line-of-sight microwave propagation

Cited by 18 publications

References 14 publications

Channel Model for the Surface Ducts: Large-Scale Path-Loss, Delay Spread, and AOA

Channel Model for the Surface Ducts: Large-Scale Path-Loss, Delay Spread, and AOA

Statistical characterization of line‐of‐sight microwave links

Dispersive microwave fading and lower atmospheric structure: An observational study

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