Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cram\'er-Rao Lower Bounds for Positioning with Large Intelligent
  Surfaces   We consider the potential for positioning with a system where antenna arrays
are deployed as a large intelligent surface (LIS). We derive
Fisher-informations and Cram\'{e}r-Rao lower bounds (CRLB) in closed-form for
terminals along the central perpendicular line (CPL) of the LIS for all three
Cartesian dimensions. For terminals at positions other than the CPL,
closed-form expressions for the Fisher-informations and CRLBs seem out of
reach, and we alternatively provide approximations (in closed-form) which are
shown to be very accurate. We also show that under mild conditions, the CRLBs
in general decrease quadratically in the surface-area for both the $x$ and $y$
dimensions. For the $z$-dimension (distance from the LIS), the CRLB decreases
linearly in the surface-area when terminals are along the CPL. However, when
terminals move away from the CPL, the CRLB is dramatically increased and then
also decreases quadratically in the surface-area. We also extensively discuss
the impact of different deployments (centralized and distributed) of the LIS.

15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
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: funct-an
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
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The categories of this paper are: cmp-lg