Nearest object priority based integrated rough surface scattering algorithm for 3D indoor propagation prediction (original) (raw)
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The Scientific World Journal, 2014
Although ray tracing based propagation prediction models are popular for indoor radio wave propagation characterization, most of them do not provide an integrated approach for achieving the goal of optimum coverage, which is a key part in designing wireless network. In this paper, an accelerated technique of three-dimensional ray tracing is presented, where rough surface scattering is included for making a more accurate ray tracing technique. Here, the rough surface scattering is represented by microfacets, for which it becomes possible to compute the scattering field in all possible directions. New optimization techniques, like dual quadrant skipping (DQS) and closest object finder (COF), are implemented for fast characterization of wireless communications and making the ray tracing technique more efficient. In conjunction with the ray tracing technique, probability based coverage optimization algorithm is accumulated with the ray tracing technique to make a compact solution for in...
3D Channel Simulations Including Scattering from Non-Gaussian Rough Surfaces
An original approach to characterize radio channel in indoor environments composed of rough surfaces is presented. It is based on algorithms developed for the image rendering field that are extended to the radio wave propagation. To simulate rough surfaces scattering, these algorithms need information about roughness. A possible solution consists of quantifying roughness by using statistical distributions of surface parameters, such as heights, slopes and local normals. In this paper, different theoretical statistical laws are presented and a fitting is realized with corresponding distributions of three real samples of wall roughcasts. For these cases, the best parameter to quantify the roughness is presented. Next, two algorithms which take roughness into account are detailed and compared with first results of channel simulations in indoor environments at 60 GHz.
A new scattering method that combines roughness and diffraction effects
The Journal of the Acoustical Society of America, 2005
Most of today's room acoustics programs make use of scattering coefficients which are used in order to describe surface scattering (roughness of material) and scattering of reflected sound caused by limited surface size (diffraction). A method which combines scattering caused by diffraction due to typical surface dimensions, angle of incidence and incident path length with surface scattering is presented. Each of the two scattering effects is modeled as frequency dependent functions. The benefits are twofold: • Separating the user specified surface scattering coefficient from the room geometry makes it easier for the user to make good gestimates of the coefficients that will be in better agreement with the ones that can be measured. In many cases a scattering coefficient of say 5% for all smooth surfaces may be sufficient. • Scattering due to diffraction is distance and angle dependent and as such it is not known before the source and receiver are defined, and the actual 'ray-tracing' or image source detection takes place. An example on this is that a desktop will provide a strong specular component to its user whereas it will provide scattered sound at remote distances.
Measurement and modelling of scattering from buildings
Ieee Transactions on Antennas and Propagation, 2007
The results of a measurement campaign aimed at determining the far-field diffuse scattering pattern of typical building walls are shown in the paper. Such results are then used to determine and tune simple diffuse scattering models based on the effective roughness approach, to be embedded into ray tracing simulators. It is shown that by adopting an appropriate single-lobe scattering pattern the agreement between simulation and measurement is very good
Comparison between two original methods including scattering in 3D channel simulations
Two original methods to characterize the channel behavior in indoor environments composed of rough surfaces are presented and compared between themselves. They are based on algorithms developed for the image rendering field using Monte-Carlo methods to simulate the scattering phenomenon from rough surfaces. A previous study has shown which statistical parameters of real rough surfaces such as wall roughcasts have to be considered in order to have the more realistic scattering simulation as possible. Firstly, this paper presents in details the two studied methods. Secondly, we compare their performance and accuracy by simulating the radio channel for different rough indoor environments at 60 GHz Index Terms -3D ray tracing, indoor environments, Monte Carlo, rough surfaces, scattering.
Proceedings of the 13th …, 2002
This paper discusses an efficient implementati on of Deterministic Ray Tracing model for indoor wireless propagation and the nth order contribution of reflection components. It is important to characterize the indoor propagation channel to ensure satisfactory performance of a wireless communication system. Ray tracing method is extremely effective in indoor environments for estimating the average propagation loss caused by severe multi path reflections. In this model the dominant rays are calculated using Geometrical Optics implemented by the method of images. Deterministic models are computationally expensive but provide accurate results, which become essential in Indoor Wireless site-specific propagation modeling. A Software package has been developed which performs 3-D ray tracing and calculates signal strength variations in a given wireless environment. To validate software results, experimentation at 836 MHz & 1 GHz was carried out in the building of Electrical Engineering Department at UET Lahore. Measured results were mostly found to be in close agreement with the calculated values, proving the validity of the implemented model.
Measurement and modelling of scattering from building walls
A measurement campaign aimed at determining the diffuse scattering pattern of typical building walls has been carried out and results are shown in the paper. Such results are then used to determine and tune simple diffuse scattering models based on the Effective Roughness approach, to be embedded into ray tracing simulators. It is shown that by adopting an appropriate single-lobe scattering pattern the agreement between simulation and measurement is very good.
A novel 3D ray launching technique for radio propagation prediction in indoor environments
PloS one, 2018
Radio propagation prediction simulation methods based on deterministic technique such as ray launching is extensively used to accomplish radio channel characterization. However, the superiority of the simulation depends on the number of rays launched and received. This paper presented the indoor three-dimensional (3D) Minimum Ray Launching Maximum Accuracy (MRLMA) technique, which is applicable for an efficient indoor radio wave propagation prediction. Utilizing the novel MRLMA technique in the simulation environment for ray lunching and tracing can drastically reduce the number of rays that need to be traced, and improve the efficiency of ray tracing. Implementation and justification of MRLMA presented in the paper. An indoor office 3D layouts are selected and simulations have been performed using the MRLMA and other reference techniques. Results showed that the indoor 3D MRLMA model is appropriate for wireless communications network systems design and optimization process with res...
Influence of an Accurate Environment Description for the Indoor Propagation Channel Modelling
The European Conference on Wireless Technology, 2005., 2005
The current wireless systems evolve towards multimedia applications demanding more and more high bit rate. Consequently, we observe an important rise in frequency. Then, it becomes necessary to study the influence of particular details of environment such as rough surfaces or small and complex scattering structures. Nowadays, ray tracing techniques, based on the Geometrical Optic (OG) and the Uniform Theory of Diffraction (UTD), are the dominant techniques to predict the channel behaviour over a large bandwidth. Our study aims to improve the ray tracing power for the indoor propagation channel modelling by taking into account particular details of the environment.