Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Backscatter Communication System With Dumb Diffusing Surface   Ambient backscatter communications have been identified for ultra-low energy
wireless communications. Indeed, a tag can send a message to a reader without
emitting any wave and without battery, simply by backscattering the waves
generated by a source. In the simplest implementation of such a system, the tag
sends a binary message by oscillating between two states and the reader detects
the bits by comparing the two distinct received powers. In this paper, for the
first time, we propose to study an ambient backscatter communication system, in
the presence of a diffusing surface, a simple flat panel that diffuses in all
directions. We establish the analytical closed form expression of the power
contrast in the presence of the surface. We show that the diffusing surface
improves the power contrast. Moreover our approach allows us to express the
contrast to noise ratio, and therefore to establish the BER performance.
Furthermore, we derive the optimum source transmit power for a given target
power contrast. This makes it possible to quantify the amount of energy that
can be saved at the source side, thanks to the diffusing surface.

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The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas