Identification of time-variant directional mobile radio channels

For the identification of the time-variant, directional structure of the mobile radio channel impulse response, a broadband vector channel sounder is described. The measurement procedure relies on periodic multifrequency excitation signals, correlation processing and joint delay-azimuth superresolution based on the ESPRIT algorithm. Problems of imperfect receiver and antenna performance and antenna array calibration methods are discussed. Results of multidimensional correlation analyses of various channel scenarios in the time-frequency-spatial domain and the corresponding Doppler-delay-angular domain are represented