Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: UbiBreathe: A Ubiquitous non-Invasive WiFi-based Breathing Estimator   Monitoring breathing rates and patterns helps in the diagnosis and potential
avoidance of various health problems. Current solutions for respiratory
monitoring, however, are usually invasive and/or limited to medical facilities.
In this paper, we propose a novel respiratory monitoring system, UbiBreathe,
based on ubiquitous off-the-shelf WiFi-enabled devices. Our experiments show
that the received signal strength (RSS) at a WiFi-enabled device held on a
person's chest is affected by the breathing process. This effect extends to
scenarios when the person is situated on the line-of-sight (LOS) between the
access point and the device, even without holding it. UbiBreathe leverages
these changes in the WiFi RSS patterns to enable ubiquitous non-invasive
respiratory rate estimation, as well as apnea detection.
  We propose the full architecture and design for UbiBreathe, incorporating
various modules that help reliably extract the hidden breathing signal from a
noisy WiFi RSS. The system handles various challenges such as noise
elimination, interfering humans, sudden user movements, as well as detecting
abnormal breathing situations. Our implementation of UbiBreathe using
off-the-shelf devices in a wide range of environmental conditions shows that it
can estimate different breathing rates with less than 1 breaths per minute
(bpm) error. In addition, UbiBreathe can detect apnea with more than 96%
accuracy in both the device-on-chest and hands-free scenarios. This highlights
its suitability for a new class of anywhere respiratory monitoring.

26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin