Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Digital RIS (DRIS): The Future of Digital Beam Management in
  RIS-Assisted OWC Systems   Reconfigurable intelligent surfaces (RIS) have been recently introduced to
optical wireless communication (OWC) networks to resolve skip areas and improve
the signal-to-noise ratio at the user's end. In OWC networks, RIS are based on
mirrors or metasurfaces. Metasurfaces have evolved significantly over the last
few years. As a result, coding, digital, programmable, and information
metamaterials have been developed. The advantage of these materials is that
they can enable digital signal processing (DSP) techniques. For the first time,
this paper proposes the use of digital RIS (DRIS) in OWC systems. We discuss
the concept of DRIS and the application of DSP methods to the physical
material. In addition, we examine metamaterials for optical DRIS with liquid
crystals serving as the front row material. Finally, we present a design
example and discuss future research directions.

32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
3
The categories of this paper are: physics
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg