| dc.description.abstract |
<p>Localization is projected to play a critical role in mobile computing applications.
Nevertheless, the state of the art is inadequate especially when operating on mobile
devices. More specifically, the on-phone GPS sensor has an unacceptable energy consumption
and does not operate indoors. Alternate localization techniques, based on WiFi or
GSM, alleviate some of the GPS limitations but provide degraded accuracy and assume
pre-installed infrastructure. As a result, these solutions need extensive war-driving
for collecting location fingerprints and, in many instances, limit services to regions
close to drivable paths. Moreover, when infrastructure is scarce or missing, the localization
accuracy is poor. Lastly, relying on hardware deployments is costly and raises scalability
concerns when targeting wide regions.</p><p>To address the shortcomings of current
solutions, we propose four new localization systems: (1) CompAcc enables energy-efficient,
war-driving-free localization using the phone inertial sensors and digital maps, (2)
Escort provides indoor localization by exploiting the phone inertial sensors and social
environments where people are mobile, (3) SurroundSense enables indoor logical localization
(e.g., inside Target) by sensing the user ambiance through the phone sensors, and
(4) EnLoc proposes energy-efficient localization via personalized mobility profiling
and predictions.</p>
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