Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Achievable information rates of ambient backscatter communications   Ambient backscatter is an intriguing wireless communication paradigm that
allows small devices to compute and communicate by using only the power they
harvest from radio-frequency (RF) signals in the air. Ambient backscattering
devices reflect existing RF signals emitted by legacy communications systems,
such as digital TV broadcasting, cellular or Wi-Fi ones, which would be
otherwise treated as harmful sources of interference. This paper deals with the
ultimate performance limits of ambient backscatter systems in broadband fading
environments, by considering different amounts of network state information at
the receivers. After introducing a detailed signal model of the relevant
communication links, we study the influence of physical parameters on the
capacity of both legacy and backscatter systems. We find that, under reasonable
operative conditions, a legacy system employing multicarrier modulation can
turn the RF interference arising from the backscatter process into a form of
multipath diversity that can be suitably exploited to noticeably increase its
performance. Moreover, we show that, even when employing simple single-carrier
modulation techniques, the backscatter system can achieve significant data
rates over relatively short distances, especially when the intended recipient
of the backscatter signal is co-located with the legacy transmitter, i.e., they
are on the same machine.

29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess