MIMO measurement and joint M-D parameter estimation of mobile radio channels

We describe a measurement and parameter identification procedure for the mobile radio propagation channel which includes the azimuth directions of the propagating waves at both link ends, elevation at the base station, time delay, and Doppler shift. The measurement is based on a broadband, real-time multiple-input-multiple-output radio channel sounder. At the mobile station a circular uniform beam array (CUBA) is used which covers 360° viewing angle whereas at the base station a uniform rectangular array (URA) is deployed. We derive the underlying data model and propose a multidimensional joint parameter estimation procedure from measurements which is based on the M-D ESPRIT algorithm. The resolution of coherent paths by subspace smoothing and the reduction of measurement errors by device calibration procedures is addressed