engleski

Ray entity based post processing and interpolation of ray tracing data for continuous modeling of radio channel

Ray tracing data is usually given as vector of many variables, such as angles of arrival and departure, transmitter and virtual transmitter coordinates, ray length and delay, received power level, and polarity. Usually, these values are given in raw data with some resolution that covers the area of interest where the simulation is obtained. There are two main drawbacks of such approach ; firstly a huge amount of storage capacity is typically needed to store all necessary data and secondly, although the area of interest is covered by certain resolution, it is not straightforward or nearly impossible to interpolate between sample points and new time and memory consuming simulations are necessary in order to increase resolution of simulations. This paper addresses the two mentioned drawbacks of ray tracing, suggesting a procedure based on ray entities to both enable continuous interpolation of ray tracing data and reduce memory needed for storing data. Ray entity is a set of rays that all undergo same propagation phenomenon (direct ray, diffraction, reflection or scattering) on the same objects (building wall or edges). The method is given and illustrated for reflection and diffraction phenomena and diffuse scattering was not interpolated, but discussion is easily extended to this propagation type as well. Paper gives detailed statistics of entities length and rays count per simulated receiver point and provide insight how to interpolate angles of arrival and departure, ray length and received power level in order to provide less memory and processor time demanding and yet more precise description of the radio environment.

ray entity, interpolation, continuous modelling of radio channel

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