An Improved Image-Based Propagation Model for Indoor and Outdoor Communication Channels

Teh, C. H.; Chuah, H. T.

doi:10.1163/156939303766975335

Cited by 16 publications

(6 citation statements)

References 10 publications

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“…To expedite calculation, various space partition methods such as octree, quad tree and acceleration techniques can be used [16][17][18][19][20][21][22][23][24]. The information is statistically analyzed and various channel parameters are obtained.…”

Section: Calculation Of Light Intensitymentioning

confidence: 99%

A Photon Modeling Method for the Characterization of Indoor Optical Wireless Communication

Lee¹

2009

PIER

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Abstract-In this paper, an analysis method for optical wave propagation based on photon model is presented for the characterization of optical wireless communication environment. In contrast to radio waves, optical waves have very short wavelengths, so that material properties become important and often cause diffuse reflections. Channel models including diffuse reflections and absorption effects due to material surface textures make conventional electromagnetic wave analysis methods based on ray tracing consume enormous time. To overcome these problems, an analysis method using photon model is presented that approximates light intensity by density of photons. The photon model also ensures that simulation time is within a predictable limit and the accuracy is proportional to the number of total photons used in the simulation.

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Section: Calculation Of Light Intensitymentioning

confidence: 99%

A Photon Modeling Method for the Characterization of Indoor Optical Wireless Communication

Lee¹

2009

PIER

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“…A variant of beam tracing technique has been developed by Teh and Chuah [8]. Generic polygons are traced instead of the beams.…”

Section: Modeling Of Emc Test Chambermentioning

confidence: 99%

Modeling of Anechoic Chamber Using a Beam-Tracing Technique

Chung¹,

Teh²,

Chuah³

2004

PIER

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Abstract-Building an anechoic chamber involves a substantial investment both financially and in physical space. Hence, there is much interest in trying to reduce the required investment while still maintaining adequate performance. The performance of an anechoic chamber depends on the type, size, and array configuration of the absorber elements as well as the geometry of the screened room on which the inner surfaces are covered with RF absorbers. If the room geometry is designed such that an electromagnetic ray from the transmitter will only reach the receiver antenna after a few reflections, the wave energy may be sufficiently damped after a few bounces off the absorbing walls and ceiling. Hence, lower cost RF absorbers can be used to make the anechoic chamber design more economical. In this paper, a variant of beam-tracing technique is used for modeling of anechoic chamber to study the normalized site attenuation (NSA) performance of the anechoic chamber. This allows the chamber performance to be predicted prior to the actual construction. The major advantage of beam-tracing over ray tracing is the path loss information at multiple receiver locations can be determined simultaneously as opposed to running a ray tracing simulation for each receiver location one at a time. As a result, the computing time is greatly reduced. This feature is particularly useful in calculating the field strength at different heights of the receiving antenna in EMC site calibration procedure. The efficient modeling tool has given rise to the successful design and construction of an asymmetrical shape anechoic chamber that supports various measurement needs including EMC tests at

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“…Furthermore, MSBR was further improved by using a graphics processing unit [5]. Latterly, beam tracing [6][7][8][9][10][11][12] was applied to RCS predictions. In general, beam tracing requires less incident ray tubes than conventional SBR for electrically large targets [6,7].…”

Section: Introductionmentioning

confidence: 99%

Improvement of RCS Prediction Using Modified Angular Division Algorithm

Park¹,

Park²,

Kim³

et al. 2012

PIER

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Abstract-The shooting and bouncing rays (SBR) method has been widely used to predict the radar cross section (RCS) of electrically large and complex targets. SBR computation time rapidly increases as the size and the complexity of a target increase. The angular division algorithm (ADA) can be applied to reduce the number of intersection tests in SBR, which facilitates faster RCS prediction. However, ADA has an error in its table construction step, resulting in incorrect prediction for multiple scattered fields. In this paper, the error is described, and the modified ADA (MADA) is proposed to correct the error and to enhance accuracy. Numerical results show that MADA can achieve good RCS prediction accuracy.

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An Improved Image-Based Propagation Model for Indoor and Outdoor Communication Channels

Cited by 16 publications

References 10 publications

A Photon Modeling Method for the Characterization of Indoor Optical Wireless Communication

A Photon Modeling Method for the Characterization of Indoor Optical Wireless Communication

Modeling of Anechoic Chamber Using a Beam-Tracing Technique

Improvement of RCS Prediction Using Modified Angular Division Algorithm

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