Time-Varying Phase Noise and Channel Estimation in MIMO Systems
Performance of high speed communication systems is negatively affected by oscillator Phase Noise (PN). In this paper joint estimation of channel gains and Wiener PN in Multi-Input Multi-Output (MIMO) systems is analyzed. The signal model for the estimation problem is outlined in detail. In order to reduce overhead, a low complexity data-aided Least-Squares (LS) estimator for jointly obtaining the channel gains and PN parameters is derived. In order to track PN processes over a frame, a new decision-directed Extended Kalman Filter (EKF) is proposed.