Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Performance Studies of Underwater Wireless Optical Communication Systems
  with Spatial Diversity: MIMO Scheme   In this paper, we analytically study the performance of multiple-input
multiple-output underwater wireless optical communication (MIMO UWOC) systems
with on-off keying (OOK) modulation. To mitigate turbulence-induced fading,
which is amongst the major degrading effects of underwater channels on the
propagating optical signal, we use spatial diversity over UWOC links.
Furthermore, the effects of absorption and scattering are considered in our
analysis. We analytically obtain the exact and an upper bound bit error rate
(BER) expressions for both optimal and equal gain combining. In order to more
effectively calculate the system BER, we apply Gauss-Hermite quadrature formula
as well as approximation to the sum of lognormal random variables. We also
apply photon-counting method to evaluate the system BER in the presence of shot
noise. Our numerical results indicate an excellent match between the exact and
upper bound BER curves. Also {a good match} between {the} analytical results
and numerical simulations confirms the accuracy of our derived expressions.
Moreover, our results show that spatial diversity can considerably improve the
system performance, especially for channels with higher turbulence, e.g., a
$3\times1$ MISO transmission in a $25$ {m} coastal water link with
log-amplitude variance of $0.16$ can introduce $8$ {dB} performance improvement
at the BER of $10^{-9}$.

15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph