IEEE TRANSACTIONS ON SIGNAL PROCESSING 1 Modified Kalman Filters for Channel Estimation in Orthogonal Space-Time Coded Systems

We derive and analyze two modified Kalman channel estimators (KCE) for time-varying, flat, spatially correlated MIMO channels in systems employing orthogonal space-time block codes: the steady-state KCE, which is less complex than the KCE, and the fading memory KCE, which is more robust to model mismatch. Index Terms Channel tracking, Kalman filtering, space-time coding, MIMO systems, algebraic Riccati equation, steady-state Kalman filter, fading memory Kalman filter I