Double-Sided Beamforming in OWC Systems Using Omni-Digital Reconfigurable Intelligent Surfaces
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by
Alain R. Ndjiongue, Telex M. N. Ngatched, Octavia A. Dobre, Harald Haas
2022
Abstract
In this paper, we introduce a variant of reconfigurable intelligent surfaces
(RISs) called omni-digital-RISs (DRISs), which allow multiple physical
processes, with application to optical wireless communications systems. The
proposed omni-DRIS contains both reflectors and refractive elements, as well as
elements that perform both simultaneously. We describe and explain the concept
of omni-DRIS, suggest and analyze an omni-DRIS coding structure, discuss
metamaterials to be used, and provide a design example. Furthermore, we
demonstrate that the achievable rate of an omni-DRIS system depends on the
number of omni-DRIS elements, bits per phase shift, and the number of unused
elements. In addition, we show that the achievable rate upper bound is related
to the number of omni-DRIS elements, and conclude by discussing future research
directions.
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