Zero Forcing Uplink Detection Through Large-Scale RIS: System Performance and Phase Shift Design

A multiple-input multiple-output wireless communication system is analytically studied, which operates with the aid of a large-scale reconfigurable intelligent surface (LRIS). LRIS equipped multiple passive elements discrete phase adjustment capabilities, and independent Rician fading conditions are assumed for both transmitter-to-LRIS LRIS-to-receiver links. direct transceiver link also considered modeled by Rayleigh distribution. The performance studied when linear yet efficient zero-forcing detection implemented at receiver. In particular, outage derived in closed-form expression different configuration setups regards to available channel state information (CSI) fact, case perfect imperfect CSI analyzed. Also, an shift design approach introduced, on number receive antennas. proposed can be applied two modes operation; namely, strives adapt either instantaneous or statistical CSI. Finally, some impactful engineering insights provided, such as how conditions, CSI, resolution, volume antenna/LRIS element arrays impact overall performance.