Fig. 2From: On the use of the channel second-order statistics in MMSE receivers for time- and frequency-selective MIMO transmission systemsData exchange between the KF and the a MMSE + KF and b SOS-MMSE+KF receivers. The figure stresses the fundamental difference between the conventional MMSE and the one proposed. Notice how the channel matrix covariance given by the KF is fed to the smoother in the lower figure, whereas it is discarded in the upper oneBack to article page