An Experimental Study on Indoor Massive 3D-MIMO Channel at 30-40 GHz Band

Three-dimensional (3D) multiple-input multiple-output (MIMO) channel sounder measurements of a multi-user MIMO channel at the 30-40 GHz mm-wave band are presented. 3D-MIMO downlink transmissions to two users is considered. The measurement campaign employing a vector network analyzer (VNA) has been performed in an office scenario. The mm-wave 3D-MIMO channel is characterized in the wavenumber domain and the time domain via a 3D inverse fast Fourier transform (IFFT). It is shown that the massive 3D-MIMO significantly improve the estimation resolution of multipath components as compared to none-massive 3D-MIMO.