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    Efficient enhancement of the accuracy of Ray tracing 

    Type: Conference Paper
    Author : وحید محتشمی; Vahid Mohtashami
    Year: 2010
    Abstract:

    In this paper, we present a novel algorithm for improving the accuracy of ray tracing without modeling the source with high resolution. It is based on expressing each ray within a ray tube as a linear combination of three rays defining that ray tube...

    Effects of Geometrical Uncertainties on Ray Tracing Results for Site-specific Indoor Propagation Modeling 

    Type: Conference Paper
    Author : وحید محتشمی; Vahid Mohtashami
    Year: 2013
    Abstract:

    The plan of the environment used in a ray tracing simulation is not usually in exact accordance with the actual environment plan. Errors on the order of several centimeters may be present in describing the lateral wall positions. Such errors...

    Effects of inaccuracy of material permittivities on ray tracing results for site-specific indoor propagation modeling 

    Type: Conference Paper
    Author : وحید محتشمی; Vahid Mohtashami
    Year: 2013
    Abstract:

    The complex dielectric constants of building materials are present in the reflection, transmission and diffraction coefficients of the ray tracing formulation. Any deviation of the dielectric constants included in ray tracing simulation from...

    Efficient shooting and bouncing ray tracing using decomposition of wavefronts 

    Type: Journal Paper
    Author : وحید محتشمی; A.A. Shishegar; Vahid Mohtashami
    Year: 2010
    Abstract:

    A new acceleration technique is presented for shooting and bouncing ray tracing in indoor environments. Tracing just a few rays, the algorithm finds the solid angles around the transmitter that transport electromagnetic power to the receiver...

    Modified wavefront decomposition method for fast and accurate ray-tracing simulation 

    Type: Journal Paper
    Author : وحید محتشمی; A.A. Shishegar; Vahid Mohtashami
    Year: 2012
    Abstract:

    This study presents the modified wavefront decomposition method as a new ray-tracing acceleration technique for indoor propagation modelling. In this method, the exact propagation paths of the rays that reach the receiver after multiple reflections...

    Travel time computations using a compact eikonal equation for vertical transverse isotropic media 

    Type: Journal Paper
    Author : Peyman Moghaddam; رضا خواجوی; Henk Keers; Peyman Moghaddam; Reza Khajavi; Henk Keers
    Year: 2018
    Abstract:

    Eikonal solvers often have stability problems if the velocity model is mildly heterogeneous.
    We derive a stable and compact form of the eikonal equation for P-wave
    propagation in vertical transverse isotropic media. ...

    Using cubic B-spline interpolation for efficient ray-tracing-based ultrawideband propagation modeling 

    Type: Conference Paper
    Author : وحید محتشمی; Vahid Mohtashami
    Year: 2011
    Abstract:

    Abstract—Site-specific ultrawideband propagation modeling involves dealing with frequency variations of the propagation mechanisms and antenna patterns in the ray tracing program. Typically, electromagnetic field calculations have to be performed...

    Sensitivity analysis of ray tracing to the geometrical description of the environment 

    Type: Journal Paper
    Author : وحید محتشمی; Amir Ahmad Shishegar; Vahid Mohtashami
    Year: 2016
    Abstract:

    In ray-tracing-based propagation modelling, the electromagnetic field at the receiver is obtained by coherent summation of the fields of multipath components. It is therefore crucial to accurately calculate the phase of the electromagnetic field...

    Accuracy and computational efficiency improvement of ray tracing using line search theory 

    Type: Journal Paper
    Author : وحید محتشمی; A.A. Shishegar; Vahid Mohtashami
    Year: 2010
    Abstract:

    This study presents a new ray tracing acceleration technique for site-specific propagation modelling in

    indoor environments. It overcomes one of the major problems regarding the computational efficiency of...

    Efficient ultrawideband propagation modelling by using the cubic B-spline function in ray tracing calculations 

    Type: Journal Paper
    Author : وحید محتشمی; A.A. Shishegar; Vahid Mohtashami
    Year: 2012
    Abstract:

    In site-specific ultrawideband propagation modelling, electromagnetic field calculations need to be performed by ray tracing at numerous frequencies of the band in order to properly include the frequency variations of the propagation mechanisms...

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