Channel Tracking for Hybrid Digital-Analog Architecture in mmWave Systems

Millimeter wave (mmWave) with its large spectrum bandwidth is an attractive technology to achieve high date rate, high security and so on. However, it is always difficult to obtain channel state information (CSI) since the mmWave signals undergo large attenuation. This paper proposes a channel tracking algorithm for mmWave multiple input multiple-output (MIMO) systems, where hybrid precoder and combiner are employed by the transmitter and the receiver, respectively. The algorithm uses extended Kalman filter (EKF) to track the CSI and updates the hybrid combiner to improve tracking accuracy further. Simulation results prove that the proposed algorithm has lower tracking error compared to prior work.