A ray splitting model for indoor radio propagation associated with complex geometries

Kreuzgruber, P.; Unterberger, P.; Gahleitner, R.

doi:10.1109/vetec.1993.507050

Cited by 32 publications

(14 citation statements)

References 3 publications

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“…It is possible to determine the path length and reflection coefficient of each ray striking a surface in a room using ray tracing approaches [16]- [29]. However, this approach as well as other numerical approaches [30]- [34] are time consuming.…”

Section: B Reflected Power Levelsmentioning

confidence: 99%

“…There are various techniques available for predicting these multipath effects. Geometric optics (or ray tracing) models [16]- [29], finite-difference time-domain (FDTD) models [30]- [33], and time-domain integral equation models [34] have been used to calculate the impulse response and the PDP for indoor channels. While these numerical techniques are accurate, they are time consuming.…”

Section: Introductionmentioning

confidence: 99%

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A model for predicting the power delay profile characteristics inside a room

Holloway

Cotton

McKenna

1999

IEEE Trans. Veh. Technol.

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Multipath effects in indoor wireless communication systems exhibit a characteristic power delay profile (PDP) and can be a detriment to system performance. In this paper, we present a simplified model for calculating the decay rate of the PDP for propagation within rooms. This simplified model provides a time-efficient means of predicting system performance. Predictions of this in-room PDP model are compared to results obtained from a finite-difference time-domain (FDTD) model. Additionally, comparisons of the IPDP model to measured data are presented. The rms delay spread is the second central moment of the PDP of a propagation channel and is a measure of the communication link degradation due to multipath. We also show results of the estimated rms delay spread from this model and show comparisons to the measured data. This IPDP model can be used to investigate the effects of variable room size and properties of the surfaces (or walls) on the decay characteristics of the PDP.Index Terms-Channel modeling, delay spread, impulse response, multipath, power delay profile.

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Section: B Reflected Power Levelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A model for predicting the power delay profile characteristics inside a room

Holloway

Cotton

McKenna

1999

IEEE Trans. Veh. Technol.

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“…For indoor environments, however, these methods must be implemented in a three-dimensional code, for which the number of traced rays becomes critical, as it is directly related to required computation times [3]. Various techniques have been proposed to reduce the number of traced rays, like the use of a receiving sphere [4], or the big ray tracing technique [5][6][7]. For the same goal, this Letter proposes another technique, which allows sufficiently accurate, fast computation of fields in a multireflecting environment.…”

Section: Introductionmentioning

confidence: 99%

A beam launching method for propagation modeling in multipath contexts

Tahri¹,

Letrou

Hanna³

2002

Micro & Optical Tech Letters

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“…Some systems avoid the geometric complexity of beam tracing by approximating each beam by its medial axis ray for intersection and mirror operations [36], possibly splitting rays as they diverge with distance [31,42]. In this case, the beam representation is only useful for modeling the distribution of rays/energy with distance and for avoiding large tolerances in ray-receiver intersection calculations.…”

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confidence: 99%

A beam tracing approach to acoustic modeling for interactive virtual environments

Funkhouser

Carlbom

Elko

et al. 1998

Proceedings of the 25th Annual Conference on Computer Graphics and Interactive Techniques - SIGGRAPH '98

159

123

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Virtual environment research has focused on interactive image generation and has largely ignored acoustic modeling for spatialization of sound. Yet, realistic auditory cues can complement and enhance visual cues to aid navigation, comprehension, and sense of presence in virtual environments. A primary challenge in acoustic modeling is computation of reverberation paths from sound sources fast enough for real-time auralization. We have developed a system that uses precomputed spatial subdivision and "beam tree" data structures to enable real-time acoustic modeling and auralization in interactive virtual environments. The spatial subdivision is a partition of 3D space into convex polyhedral regions (cells) represented as a cell adjacency graph. A beam tracing algorithm recursively traces pyramidal beams through the spatial subdivision to construct a beam tree data structure representing the regions of space reachable by each potential sequence of transmission and specular reflection events at cell boundaries. From these precomputed data structures, we can generate high-order specular reflection and transmission paths at interactive rates to spatialize fixed sound sources in real-time as the user moves through a virtual environment. Unlike previous acoustic modeling work, our beam tracing method: 1) supports evaluation of reverberation paths at interactive rates, 2) scales to compute highorder reflections and large environments, and 3) extends naturally to compute paths of diffraction and diffuse reflection efficiently. We are using this system to develop interactive applications in which a user experiences a virtual environment immersively via simultaneous auralization and visualization.

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A ray splitting model for indoor radio propagation associated with complex geometries

Cited by 32 publications

References 3 publications

A model for predicting the power delay profile characteristics inside a room

A model for predicting the power delay profile characteristics inside a room

A beam launching method for propagation modeling in multipath contexts

A beam tracing approach to acoustic modeling for interactive virtual environments

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