Fine-Resolution Ranging Scheme Based on Signal Strength in Indoor Hallway With Rough-Surface Slab Waveguide

Signal strength based indoor geolocation

∗ This research has been supported, in part, by grants from NTT DoCoMo, Inc., NJCWT (the New Jersey Center for Wireless Telecommunications), Panasonic Technologies, Inc., and Project 69931040 supported by NSFC. Abstract We have investigated the indoor geolocation based on signal strength modeling. Linear, compensated linear, and multiple regression methods have been applied to set up signal str...

High-Resolution Indoor RF Ranging

Our recently developed indoor RF Ranging technology allows new levels of accurate indoor localization based on carrier-phase measurements. Measuring the phase difference over multiple frequencies, and combining it with a novel multipath angle-of-arrival differentiation technique, we achieving accuracies of a few centimeters in direct line of sight, and a few tens of centimeters in non-direct li...

Indoor location tracking using Signal Strength Pinpoints

There have been many research efforts on location awareness in an indoor environment. Most of them rely on specialized equipment or motion detectors. This research focuses on signal strengths from WiFi transmitters and uses these signal strengths to calibrate virtual pinpoints. A pinpoint is a collection of stored signal strengths over time on a predetermined location. These pinpoints can then ...

Changes in received signals with a WLAN signal strength - based indoor localisation system

Realization of "trapped rainbow" in 1D slab waveguide with surface dispersion engineering.

We present a design of a one dimensional dielectric waveguide that can trap a broadband light pulse with different frequency component stored at different positions, effectively forming a "trapped rainbow" [Nature 450, 397 (2007)]. The spectrum of the rainbow covers the whole visible range. To do this, we first show that the dispersion of a SiO(2) waveguide with a Si grating placed on top can b...