Semi-blind Channel Estimation Based on Superimposed Pilots for Single-Carrier MIMO Systems

We propose a semi-blind channel estimator based on superimposed pilots for the case of single-carrier single-user MIMO systems. The proposed estimator is based on the expectation maximization (EM) algorithm. Numerical results show that even with this semi-blind estimator, the classical approach of time-multiplexed pilots still outperforms the superimposed approach, except for a large number of receive antennas and not too short frames.