Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fast prototyping of an SDR WLAN 802.11b receiver for an indoor
  positioning system   Indoor positioning systems (IPS) are emerging technologies due to an
increasing popularity and demand in location based service (LBS). Because
traditional positioning systems such as GPS are limited to outdoor
applications, many IPS have been proposed in literature. WLAN-based IPS are the
most promising due to its proven accuracy and infrastructure deployment.
Several WLAN-based IPS have been proposed in the past, from which the best
results have been shown by so-called fingerprint-based systems. This paper
proposes an indoor positioning system which extends traditional WLAN
fingerprinting by using received signal strength (RSS) measurements along with
channel estimates as an effort to improve classification accuracy for scenarios
with a low number of Access Points (APs). The channel estimates aim to
characterize complex indoor environments making it a unique signature for
fingerprinting-based IPS and therefore improving pattern recognition in
radio-maps. Since commercial WLAN cards offer limited measurement information,
software-defined radio (SDR) as an emerging trend for fast prototyping and
research integration is chosen as the best cost-effective option to extract
channel estimates. Therefore, this paper first proposes an 802.11b WLAN SDR
beacon receiver capable of measuring RSS and channel estimates. The SDR is
designed using LabVIEW (LV) environment and leverages several inherent platform
acceleration features that achieve real-time capturing. The receiver achieves a
fast-rate measurement capture of 9 packets per second per AP. The
classification of the propose IPS uses a support vector machine (SVM) for
offline training and online navigation. Several tests are conducted in a
cluttered indoor environment with a single AP in 802.11b legacy mode. Finally,
navigation accuracy results are discussed.

32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio