1. SpinLoc: Indoor localization
Spin once to know your location
Souvik Sen
Duke University
Romit Roy Choudhury
Duke University
Srihari Nelakuditi
University of South Carolina
Presented by
Mallika Kogatam

2. Indoor Localization Localization: To locate a device. Why not GPS?
Wardriving/ Warwalking: Searching for a Wi-fi network while changing location.
Cost and human effort associated with other indoor localization methods.

3. SpinLoc: Introduction
Hypothesis: Maximum attenuation is observed when the human is in between the device and the AP.

4. Signal Transmission in Indoor environment
EDP (Energy of Direct Path) Vs RSSS (Receiving signal strength)

5. EDP Vs RSSS

7. Filtering the signal

8. EDP Vs Orientation
In all cases, we have least EDP at 180 degrees.

11. Choosing APs based on signal strength

12. Performance Evaluation
Angle error reduces with increasing SNR

13. Error reduces with increasing APs

14. Spinloc Limitations and future research
Requires user to spin once.
Depends on availability of atleast 3 APs with high SNR.
Results could vary with increasing crowd.
Need to be able to localize based on turns instead of 360 degree rotation.
Should be able to constantly localize without user making full rotation.

15. Queries??
Thanks and regards
Mallika Kogatam