Reconfigurable Intelligent Surface Optimal Placement in Millimeter-Wave Networks
share
This work discusses the optimal placement of a reconfigurable intelligent surface (RIS) in a millimeter wave (mmWave) point-to-point link. In particular, we present a novel system model that takes into account the relationship between the transmission beam footprint size at the RIS plane and the RIS size. Moreover, we present the theoretical framework that quantifies the RIS gain loss in the case that the transmission beam footprint in the RIS plane is smaller than the RIS size, and the beam waste for the case in which the transmission beam footprint in the RIS plane is larger than the RIS size, by extracting closed-form expressions for the received power and the end-to-end signal-to-noise-ratio (SNR) for both cases. Subsequently, building upon the expressions, we provide SNR maximization policies for both cases. Finally, we perform a comparison, in terms end-to-end SNR, between the RIS-aided link and its relay-aided counterpart.
READ FULL TEXT