Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Channel Modeling and Signal Processing for Array-based Visible Light
  Communication System in Misalignment   This paper proposes an indoor visible light communication (VLC) system with
multiple transmitters and receivers. Due to diffusivity of LED light beams,
photodiode receive signals from many directions. We use one concave and one
convex lens as optical antenna, and obtain the optimal lens structure by
optimizing which corresponds to the minimum condition number of channel gain
matrix. In this way the light emitted by different LED can be separated well
from each other then minimize signal interference. However, interference
increases in the case of system deviation, so we explore the system mobility.
Then subsequent signal processing is carried out, including signal combining
and successive interference cancellation (SIC). We combine the same signal
received by different receivers to improve signal to interference noise ratio
(SINR). And SIC can effectively restore interference and eliminate its impact.
The simulation results show that channel capacity can be increased by more than
5 times and up to 20 times under the condition of receiver and transmitter
alignment. In the case of movement, channel capacity can also be increased by
about 4 times on average. Moreover, the mobile range of system is also
significantly expanded.

13
The categories of this paper are: quant-ph
4
The categories of this paper are: cond-mat
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics