Tensor Decomposition-Aided Time-Varying Channel Estimation for Millimeter Wave MIMO Systems

In this letter, a tensor decomposition-aided channel estimation scheme is proposed for millimeter wave (mmWave) time-varying channels. Due to the existence of time dimension, we model the received signal as a third-order tensor. By utilizing the property that the variations of angles of arrival/departure (AoA/AoDs) are much slower than the path gains, a two-stage tensor decomposition-based method is proposed for mmWave time-varying channel...