Abstract
This work has investigated the feasibility of applying inverse distance weight (IDW), ordinary kriging (OK) and K-nearest neighbour (K-NN) interpolation to capture the three dimensional (3D) distribution of television (TV) grey space (TVGS) within the interior of a six storied building. Comparison of root mean square error (RMSE), correlation coefficient (CC) and speed of interpolation has been made to identify the trade-offs involved. Texture-patch transformation (TPT) has been applied for the first time to transform 3D to two dimensional (2D) for predicting TVGS. This work is the first to design an interpolation-based 3D indoor radio environment map (REM) for an active ultra-high frequency TV channel with wideband spectrum sensing. OK was shown as the most accurate method using a cross-validated comparison on RMSE and CC as metrics. A TVGS volume of 18,200 m3 was identified inside the 3D REM structure through interpolation. With an extensive experimental study of the symmetric vertical profile and choice of patch size, a TPT framework for indoor 3D REM was applied to speed-up IDW and K-NN interpolation. The complexity of the TPT based interpolation methods was also carried out to analyze the advantage of speed. Several semivariogram models were tested to arrive at the best one for using them in kriging algorithms. K-NN based interpolation for TVWS REM in 3D and through TPT has also been reported as a new approach to test the comparative performance, and through extensive cross-validation, we have deduced optimum values of K in terms of RMSE and CC accuracies.
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The work was supported by Central Public Works Department, Dhanbad and Doordarshan Kendra, Dhanbad.
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Maiti, P., Mitra, D. Ordinary kriging interpolation for indoor 3D REM. J Ambient Intell Human Comput 14, 13285–13299 (2023). https://doi.org/10.1007/s12652-022-03784-2
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DOI: https://doi.org/10.1007/s12652-022-03784-2