A novel scheme to perform multiple input multiple output （MIMO） channel identification in time-selective fading environments is suggested. In order to improve transmission efficiency, training sequences are arithmetically added to the information symbols. The output of information symbols ,additive white noises and dc-offsets at the receiver are regarded as fiction measurement noise, whose mean and autocovarianee are both unknown.A time-varying measurement noise recursive estimator and Kalman filters cooperate to track the time- varying MIMO ...
