A ray tracing method for predicting path loss and delay spread in microcellular environments

Schaubach, K.R.; Davis, Nathaniel J.; Rappaport, Theodore S.

doi:10.1109/vetec.1992.245274

Cited by 168 publications

(72 citation statements)

References 10 publications

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“…Two algorithms, the brute force ray tracing (sometime also referred to as the Shooting and Bouncing Ray (SBR) algorithm) and the image theory based algorithm, are generally used for this purpose. The SBR algorithm [29,30] is suitable for ray tracing in complex environments, but the computation complexity is relatively high and the traced results could be sensitive to some of the parameters chosen in the simulation. The image-based ray tracing is a clever alternative for environments with highly symmetrical geometries and will be used to model the tunnel propagation in this paper.…”

Section: Determination the Attenuation Constant Based On Geometrical mentioning

confidence: 99%

Attenuation Constants of Radio Waves in Lossy-Walled Rectangular Waveguides

Zhou¹,

Waynert²,

Plass³

et al. 2013

PIER

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Abstract-At the ultra-high frequencies (UHF) common to portable radios, the mine tunnel acts as a dielectric waveguide, directing and absorbing energy as a radio signal propagates. Understanding radio propagation behavior in a dielectric waveguide is critical for designing reliable, optimized communication systems in an underground mine. One of the major parameters used to predict the power attenuation in lossy waveguides is the attenuation constant. In this paper, we theoretically and experimentally investigate the attenuation constants for a rectangular waveguide with dielectric walls. We provide a new derivation of the attenuation constant based on the classic Fresnel reflection coefficients. The new derivation takes advantage of ray representation of plane waves and provides more insight into understanding radio attenuation in tunnels. We also investigate the impact of different parameters on the attenuation constant, including the tunnel transverse dimensions, permittivity, conductivity, frequency, and polarization, with an aim to find their theoretical optimal values that result in the minimum power loss. Additionally, measurements of the attenuation constants of the dominant mode at different frequencies (455, 915, 2450, and 5800 MHz) for a straight concrete tunnel are presented and compared to theoretical predictions. It is shown that the analytical results match the measured results very well at all four frequencies.

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Section: Determination the Attenuation Constant Based On Geometrical mentioning

confidence: 99%

Attenuation Constants of Radio Waves in Lossy-Walled Rectangular Waveguides

Zhou¹,

Waynert²,

Plass³

et al. 2013

PIER

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show abstract

“…However, high prediction accuracy can be achieved. For instance, Schaubach et al (1992); Erceg et al (1997); Kim et al (1999) and Schmitz & Kobbelt (2006) state that their predicted path loss values were generally within 4 to 8 dB of the measured path loss which is considered as a very good result. In Mathar et al (2007) a ray launching algorithm is used which represents an urban environment as a grid of discrete blocks.…”

Section: Related Workmentioning

confidence: 88%

Accelerating Radio Wave Propagation Algorithms by Implementation on Graphics Hardware

Rick¹,

Kuhlen²

2010

Wave Propagation in Materials for Modern Applications

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“…Although material parameters and incidence angles affect losses in a wireless channel, a constant 6 dB reflection loss (same as in [15]) and a constant 4.6 dB transmission (penetration) loss (the loss for plaster board in [1]) are assumed. The power contribution of each ray, in dBW, is calculated according to the model developed in [16]:…”

Section: Ray Tracing Propagation Modelmentioning

confidence: 99%

“…3D ray tracing is used as a deterministic propagation model to estimate power coverage levels and impulse responses within the region of interest for transmitter locations sampled by the optimization algorithm [15] [16]. Surrogates for the Monte Carlo WCDMA simulation are used to estimate the BERs (bit error rates) for the second optimization criterion.…”

Section: Introductionmentioning

confidence: 99%