Evaluation and verification of the VHF/UHF propagation channel based on a 3-D-wave propagation model

Kürner, Thomas; Cichon, D.J.; Wiesbeck, W.

doi:10.1109/8.486310

Cited by 21 publications

(7 citation statements)

References 21 publications

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“…For ε r in [3,10], we get a confirmation that, with the single criterion w a > 2.3, the Zv IBC yields rather satisfactory results for the urban channel modelling purpose (say to keep average error below ≈ 1 dB). For ε r < 3, we have experienced, from a few simulations not presented here, that the results given in Figure 6 can be improved by increasing w a .…”

Section: Study Of the W A Criterion Versus The Cylinder Radiussupporting

confidence: 53%

“…In response to this need, a large number of deterministic models based on ray-tracing techniques and Uniform Theory of Diffraction (UTD) have been proposed in recent years (e.g., [1][2][3]). To determine ray paths between the base station and the mobile receiver, the most ambitious of these models use data bases that give a detailed description of the urban environment.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Luebbers' and Maliuzhinets' Wedge Diffraction Coefficients in Urban Channel Modelling

Aïdi¹,

Lavergnat²

2001

PIER

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Abstract-Luebbers' and Maliuzhinets' solutions for diffraction by a lossy wedge are compared in order to model the urban propagation channel. Derivation, validity criteria and accuracy of impedance boundary conditions (IBCs)-as a main approximation embedded in the Maliuzhinets' solution-are discussed. A modified (a slightly improved) Luebbers diffraction coefficient is proposed. The Uniform Theory of Diffraction (UTD) Maliuzhinets diffraction coefficient is given in a structured form that might facilitate its use. Detailed numerical comparisons of the above-mentioned solutions with methodof-moments solutions using either exact boundary conditions or IBCs are done for canonical configurations.

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Section: Study Of the W A Criterion Versus The Cylinder Radiussupporting

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Comparison of Luebbers' and Maliuzhinets' Wedge Diffraction Coefficients in Urban Channel Modelling

Aïdi¹,

Lavergnat²

2001

PIER

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“…There are several multipath fading models such as Nakagami, Weibull, lognormal, etc., which are not effective in characterizing the non-Rayleigh envelope PDF in some propagation environments [26] [27]. The proposed model of this paper is general enough to cover many cases of interest.…”

Section: Discussionmentioning

confidence: 99%

“…To calculate ) (z h n for this case, first we derive a closed-form expression for h z 0 ( ) in (27) and then calculate the nth derivative in (26). By the straightforward extension of a result in [13], h z 0 ( ) can be expressed in terms of the hypergeometric series:…”

Section: A 0 ≤ < ∞ Amentioning

confidence: 99%

On the Utility of Laguerre Series for the Envelope PDF in Multipath Fading Channels

Abdi

2009

IEEE Trans. Inform. Theory

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-It is well known that multipath fading significantly affects the performance of communication systems. In order to incorporate the impact of this random phenomenon on system analysis and design, in many cases we need to calculate the probability density function (PDF) of the received signal envelope in multipath fading channels. In this paper, we consider a general multipath fading channel with arbitrary number of paths, where the amplitudes of multipath components are arbitrary correlated positive random variables, independent of phases, whereas the phases are independent and identically distributed random variables with uniform distributions. Since the integral form of the envelope PDF for such a general channel model is too complicated to be used for analytic calculations, we propose two infinite expansions for the PDF, a Laguerre series and a power series. Based on the tight uniform upper bounds on the truncation error of these two infinite series, we show that the Laguerre series is superior to the power series due to the fact that for a fixed number of terms, it yields a smaller truncation error.This Laguerre series with a finite number of terms, which expresses the envelope PDF just in terms of simple polynomial-exponential kernels, is particularly useful for mathematical performance prediction of communication systems in those indoor and outdoor multipath propagation environments, where the number of strong multipath components is small.

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“…Only 11 open-literature papers (to the best of the authors' knowledge) have used three-dimensional (3-D) geometric models, 3 but none (except [23]) analytically derives closed-form explicit expressions for the TOA-AOA distributions from a geometric model. 1) Only unsolved integral relations for only the spatiotemporal correlation functions are derived in [2], [4], and [25].…”

Section: Literature Review On Geometric Modeling Formentioning

confidence: 99%

Analytically Derived Uplink/Downlink TOA and 2-D-DOA Distributions With Scatterers in a 3-D Hemispheroid Surrounding the Mobile

Olenko

Wong

Qasmi³

et al. 2006

IEEE Trans. Antennas Propagat.

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I. ANALYTICAL DERIVATION OF 3-D TOA/2-D-AOA DISTRIBUTIONSA signal, transmitted from a mobile user in a landmobile radiowave wireless cellular communication system, arrives at the cellular base station through multiple propagation multipaths. Each multipath carries its own propagation history of electromagnetic reflections and diffractions and corruption by multiplicative noise-a history reflected in that multipath's amplitude, Doppler, arrival angle, and arrival time delay at the receiving antenna(s). The values of these amplitudes, Doppler frequency shifts, arrival angles, and arrival time delays depend on the electromagnetic properties of and the spatial geometry among the mobile transmitter, the scatterers, and the receiving antennas. Each receiving antenna's data measurement sums these individually unobservable multipaths.The time of arrival (TOA) 1 distribution function characterizes the channel's temporal delay spread and frequency incoher- ence, which in turn determines the obtainable temporal diversity and the extent of intersymbol interference. The two-dimensional (2-D) azimuth-elevation angle of arrival (AOA) determines the angular spread and spatial decorrelation across the spatial aperture of an receiving antenna. The multipaths' nonzero elevation AOAs are most common in urban areas or over hilly terrains or with low-lying receiving antennas, where the propagating wave reflects off vertical structures like buildings or hills. The nonzero elevation AOA is critical for the use of a vertical or planar receiving antenna array, a fact recognized by the European Union's COST Action 259 [19]."Geometric modeling" idealizes the aforementioned wireless propagation environment via a geometric abstraction of the spatial relationships among the transmitter, the scatterers, and the base station. Geometric models thus attempt to embed measurable fading metrics integrally into the propagation channel's idealized geometry, such that the geometric parameters would affect these various fading metrics in an interconnected manner to reveal conceptually the channel's underlying fading dynamics. This work will maximally embed all derived statistics intrinsically within the propagation channel's geometry and to avoid a priori ad hoc statistical assumptions of the received signal's measurable statistics. See [27] for additional discussion on the nature of geometric modeling of wireless propagation.Geometric modeling contrasts with site-specific/terrain-specific/building-specific empirical measurements or ray-shooting/ ray-tracing computer simulations, which are applicable only to the one particular propagation setting under investigation but cannot be easily generalized to wider scenarios. One geometric model can apply for a wide class of propagation settings, producing the received signal's measurable fading metrics (e.g., the uplink and downlink probability density functions of the multipaths' arrival delay and 2-D arrival angle as in this paper) applicable generally within that class of channels.Geometric modeling contras...

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Evaluation and verification of the VHF/UHF propagation channel based on a 3-D-wave propagation model

Cited by 21 publications

References 21 publications

Comparison of Luebbers' and Maliuzhinets' Wedge Diffraction Coefficients in Urban Channel Modelling

Comparison of Luebbers' and Maliuzhinets' Wedge Diffraction Coefficients in Urban Channel Modelling

On the Utility of Laguerre Series for the Envelope PDF in Multipath Fading Channels

Analytically Derived Uplink/Downlink TOA and 2-D-DOA Distributions With Scatterers in a 3-D Hemispheroid Surrounding the Mobile

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