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This paper proposes a communication model for multiuser multiple-inputmultiple-output (MIMO) systems based on large intelligent surfaces (LIS), wherethe LIS is modeled as a collection of tightly packed antenna elements. The LISsystem is first represented in a circuital way, obtaining expressions for theradiated and received powers, as well as for the coupling between the distinctelements. Then, this circuital model is used to characterize the channel in aline-of-sight propagation scenario, rendering the basis for the analysis anddesign of MIMO systems. Due to the particular properties of LIS, the modelaccounts for superdirectivity and mutual coupling effects along with near fieldpropagation, necessary in those situations where the array dimension becomesvery large. Finally, with the proposed model, the matched filter transmitterand the weighted minimum mean square error precoding are derived under bothrealistic constraints: limited radiated power and maximum ohmic losses.

Multiuser MIMO with Large Intelligent Surfaces: Communication Model and Transmit Design