Abstract
We introduce a novel directional channel sounding concept where we sweep a horn antenna around its phase center. Directional channel measurements are thus carried out at a fixed coordinate in space. To verify our concept, we conducted multi-carrier measurements with 2 GHz of measurement bandwidth. The directional broadband channel was sampled uniformly within a cube of three wavelengths side length. In this contribution, we compare narrowband measurements with spatial averaging to traditional broadband channel sounding. We saw that, spatial filtering through directional antennas leads to a limited number of propagation paths in the channel. We show the difference of both approaches and explain the deviation by spatial correlation. The spatial correlation is evaluated at several two-dimensional slices. We observed wavelength-periodic correlations.
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