Noise sensitivity analysis of spherical wave modelling of radio channels using linear scanners

Spherical wave modeling has gained interest in radio propagation channel modelling. The idea is to consider the responses of radio channels for different spherical wave mode fields. In this paper, generation of spherical wave mode responses of a channel from measured data over a cubical scan surface is studied. Based on virtual array principle the robustness of spherical wave generation over 2-octave band for different cubical scan schemes is analyzed. This method presents the advantages for exploiting the measured data from widely used 3D linear scanners. Importantly, linear scanning supports well the acquisition of cubical scan data. Noise sensitivity analysis on a wide frequency range shows the feasibility of cubical scanning. Rules for the required number of scan locations on a cubical surface are provided.