In this paper, we present an indoor ultrasonic location tracking system that can utilize off-the-shelf
audio speakers (potentially already in place) to provide fine-grained indoor position …

The omnipresence of indoor lighting makes it an ideal vehicle for pervasive communication
with mobile devices. In this paper, we present a communication scheme that enables interior …

Visible light communication (VLC) between LED light bulbs and smart-phone cameras has
already begun to gain traction for identification and indoor localization applications. To …

Indoor localization systems typically determine a position using either ranging measurements,
inertial sensors, environmental-specific signatures or some combination of all of these …

The proliferation of Bluetooth Low-Energy (BLE) chipsets on mobile devices has lead to a
wide variety of user-installable tags and beacons designed for location-aware applications. In …

In this paper, we present the design and evaluation of a platform that can be used for time
synchronization and indoor positioning of mobile devices. The platform uses the Time-…

In this paper, we introduce Pulsar, a wireless time transfer platform that can achieve clock
synchronization to better than five nanosecond between indoor or GPS-denied devices. …

In this paper, we present a platform designed for low-power real-time sensing of the number
of occupants in indoor spaces. The system transmits a wide-band ultrasonic signal into a …

Location tracking on mobile devices like smartphones has already begun to revolutionize
personal navigation. Unfortunately, these services perform poorly indoors when GPS signals …

We demonstrate the Acoustic Location Processing System (ALPS), a platform that augments
BLE proximity beacons with ultrasonic transmitters in a manner that allows for precise and …