Type of Document Master's Thesis Author Mendoza, Hermie P URN etd-06282011-154448 Title Distributed Localization for Wireless Distributed Networks in Indoor Environments Degree Master of Science Department Electrical and Computer Engineering Advisory Committee
Advisor Name Title Reed, Jeffrey Hugh Committee Chair Bose, Tamal Committee Member Volos, Haris I. Committee Member Keywords
- indoor localization
- wireless distributed computing networks
Date of Defense 2011-06-28 Availability unrestricted AbstractPositioning systems enable location-awareness for mobile devices, computers, and even tactical
radios. From the collected location information, location-based services can be realized.
One type of positioning system is based on location fingerprints. Unlike the conventional
positioning techniques of time of or time delay of arrival (TOA/TDOA) or even angle of arrival
(AOA), fingerprinting associates unique characteristics such as received signal strength
(RSS) that differentiates a location from another location. The location-dependent characteristics
then can be used to infer a user’s location. Furthermore, fingerprinting requires no
specialized hardware because of its reliance on an existing communications infrastructure.
In estimating a user’s position, fingerprint-based positioning systems are centrally calculated
on a mobile computer using either a Euclidean distance algorithm, Bayesian statistics, or
neural networks. With large service areas and, subsequently, large radio maps, one mobile
computer may not have the adequate resources to locally compute a user’s position. Wireless
distributed computing provides a means for the mobile computer to meet the location-based
service requirements and increase its network lifetime. This thesis develops distributed localization
algorithms to be used in an indoor fingerprint-based positioning system. Fingerprint
calculations are not computed on a single device, but rather on a wireless distributed computing
network on Virginia Tech’s Cognitive Radio Network Testbed (CORNET).
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