Parametric Channel Estimation for 3D mmWave Massive MIMO/FD-MIMO Systems
In order to meet the challenge of increasing data-rate demand as well as the form factor limitation at the base station (BS), 3D massive multiple-input multiple-output (MIMO)/full dimensional(FD) MIMO has been introduced as one of the enabling technologies for fifth-generation mobile cellular systems. In 3D massive MIMO systems, especially in TDD mode of operation, a BS will rely on the uplink sounding signals from mobile stations to obtain the spatial information for downlink MIMO operations. Accordingly, multi-dimensional parameter estimation for the massive MIMO channel becomes crucial for such systems to realize the predicted capacity gains.