Reconfigurable Intelligent Surface Optimal Placement in Millimeter-Wave Networks
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Konstantinos Ntontin, Alexandros-Apostolos A. Boulogeorgos, Dimitrios Selimis, Fotis Lazarakis, Angeliki Alexiou, Symeon Chatzinotas
2020
Abstract
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.
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2011.09949v1
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