Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Intelligent Reflecting Surfaces for Free Space Optical Communications   In this paper, we investigate the use of intelligent reflecting surfaces
(IRSs) to relax the line-of-sight requirement of free space optical (FSO)
systems. Considering a Gaussian laser beam, we first design a phase-shift
distribution across the IRS that enables the reflection of the incident beam in
any desired direction, i.e., realizing the generalized law of reflection.
Moreover, for the designed phase-shift profile, we show that there exists an
equivalent mirror-assisted FSO system that generates a reflected electric field
on a mirror that is identical to that on the IRS in the original system.
However, the location of the laser source and the properties of the emitted
Gaussian laser beam are different in the original and the equivalent systems.
This equivalence allows us to study the mirror-assisted system, employing the
image method from geometric optics, instead of directly analyzing the original
IRS-assisted system. Based on this analysis, we model the geometric and
misalignment losses (GML) and characterize the impact of the physical
parameters of the IRS, such as its size, position, and orientation, on the
end-to-end FSO channel. Moreover, we develop a statistical model for the GML
which accounts for the random movements of IRS, transmitter (Tx), and receiver
(Rx) due to building sway. Furthermore, we analyze the outage probability of an
IRS-assisted FSO link based on the derived channel model. Our simulation
results validate the accuracy of the developed channel model and offer various
insights for system design. For instance, both our simulations and theoretical
analysis reveal that even if the variances of the fluctuations of the Tx, IRS,
and Rx positions caused by building sway are identical, their impact on the
end-to-end channel is not necessarily the same and depends on the relative
positioning of these three nodes.

34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys