N.N. Sysoev, P.N. Zakharov, A.F. Korolev, A.A. Potapov, A.V. Turchaninov
The article covers author's technology for indoor radio propagation prediction based upon finite integration technique (FIT) and geospatial technologies integration.
In the article the developed technology of digital problem-oriented building models (DPOMs) synthesis within geographic information system (GIS) ArcGIS software is presented; the technology utilizes the principle of double adaptive geospatial data structuring. The DPOMs are developed using construction blueprints, special methods of blueprint's vectoring and subsequent vector data structuring and mathematical processing.
GIS ArcGIS software is also implemented in ultra-detailed digital problem-oriented indoor models creation; ultra-detailed models have more information about indoor environment than there is within construction blueprints, therefore the methods of ultra-high resolution modeling of window frames and significant indoor interior objects (including metal hardware) together with the ways of merging ultra-resolution models with basic DPOM of a building are developed.
Due to the special and original structure of vector data and it's semantic component DPOMs can be successfully and easily exported to electrodynamics simulation software CST Microwave Studio; this transfer provides transformation of a DPOM into a full functional indoor environment radiotechnique model, which supports finite integration technique implementation for radio propagation simulation subject to local indoor layout.
Spatial distribution of 400 and 900 MHz fields within indoor radiotechnique model extent was computed by CST Microwave Studio software for two positions of a transmitter: within lecture room and the adjacent hall. Experimental verification of FIT consistency for frequencies 400 and 900 MHz had shown that the mean field level (averaged over λ/2 region around indoor measurement points) root-mean-square error varied over 2,1…3,7 dB range for 80 % area coverage and over 3,6…5,2 dB interval for the entire area.
CST Microwave Studio are capable of computing filed solutions in time domain. Delay profile is crucial for wireless systems design because it contains aggregated information about multipath situation on-site, which is the base for optimal radio signal modulation and equalization selection in hi-speed data transmission objectives. Experimental comparison of FIT time domain solutions based on radiotechnique model with experimental results (carrier frequency of an impulse 400 MHz; bandwidth 200 MHz) had shown correct FIT simulation of envelope curve of the actual delay profile provided the extent of radiotechnique model includes both the room itself and the nearest area beyond its walls.