Crosstalk Suppression in Parallel Spatial Channels in MIMO Communication Systems

We study the influence of the discreteness of information about the channel state, which is transmitted over the receiver–transmitter return line, on the effeiciency of MIMO systems. It is shown that such a discreteness results in energy losses and appearance of crosstalk in parallel eigenchannels of the MIMO system. We propose a method of crosstalk suppression, which ensures a pronounced decrease in the energy losses and restores the nondependence of eigenchannels with respect to transmitted symbols but leads to the correlation of output internal noise. Expressions for a maximum likely estimate of received signals are derived with allowance for the noise correlation. Mathematical simulation results showing the high efficiency of the proposed method are presented for the case of Rayleigh fading of signals.