Spherical wave modelling of radio channels using linear scanners

Research has been performed recently on spherical wave modelling of the radio propagation channels. In such a modelling the idea is to consider the responses of the radio channel for different spherical wave mode fields. A natural scan surface for the direct spherical data extraction would be spherical. However, many laboratories are equipped not with spherical scanners but with linear scanners. This paper describes how the required spherical mode responses of a channel can be extracted from the measurement data acquired on a cubical scanning surface. Rules for the required number of sampling locations on a cubical surface are provided.