Accuracy Improvement of Ray-Tracing-Based Received Power Prediction in Office Environments

Ray-tracing (RT) generally suffers from errors in the calculated received power especially at low frequencies where objects may be on the same order or smaller than the wavelength due to the high-frequency approximation used. Previously, an algorithm to reduce this error by attenuating the calculated received power depending on the object size with respect to wavelength was proposed and evaluated in an industrial environment. In this paper, we verified that the proposed algorithm can be applied not only to industrial environments but also to other environments such as office environments. The adjusted received power was compared with measured received power at 922 MHz, 4850 MHz, and 28.35 GHz bands taken in an office environment. Results show that the proposed algorithm could reduce the RMSE of received power calculated by RT from 14.1 dB, 7.5 dB, and 4.1 dB to 9.0 dB, 5.3 dB, and 3.7 dB for each frequency, respectively.