Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spatial Diversity in Radar Detection via Active Reconfigurable
  Intelligent Surfaces   Active reconfigurable intelligent surfaces (RISs) are a novel and promising
technology that allows to control the radio propagation environment, while
compensating for the product path loss along the RIS-assisted path. In this
letter, we consider the classical radar detection problem and propose to use an
active RIS to obtain a second independent look of a prospective target
illuminated by the radar transmitter. At the design stage, we select the power
emitted by the radar, the number of RIS elements, and their amplification
factor in order to maximize the detection probability, for a fixed probability
of false alarm and a common (among radar and RIS) power budget. An illustrative
example is provided to assess the achievable detection performance, also in
comparison with that of a radar operating alone or with the help of a passive
RIS.

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The categories of this paper are: hep-ex
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The categories of this paper are: stat
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
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The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
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The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol