DATE: Monday, April 30, 2012 - NOTE SPECIAL DAY
SPEAKER: Venkat Padmanabhan, MSR India
TITLE: The Quest for Zero-Effort Indoor Localization
In this talk, we will trace through our research at MSR, moving towards the goal of zero-effort indoor localization. We will start with the Radar system, which pioneered the idea of piggybacking on an existing RF-based wireless LAN to perform indoor localization. Radar introduced two approaches to indoor localization: (a) RF fingerprinting through empirical measurements made at known locations, and (b) RF computation using mathematical modeling. While these techniques offer good localization accuracy and there has been much follow-on work on further improving accuracy, making empirical measurements in a new environment is expensive and customizing the mathematical model to such an environment is challenging. To overcome these difficulties, we advocate a crowdsourcing-based approach, wherein smartphones carried by users in normal course are used to make measurements and construct models, without any explicit effort on the part of users. The key is to use the radios and sensors on these smartphones, such as WiFi, GPS, accelerometer, and compass, in unison to (i) track users and thereby enable empirical measurement of training data, using a system called Zee, and (ii) construct an RF model with patchy information, using a system called EZ.
[EZ is joint work with Krishna Chintalapudi and Anand Iyer, and Zee with Krishna, Anshul Rai, and Riju Sen.]
VISITOR HOST: Srinivasan Seshan
VISITOR COORDINATOR: Angela Miller (firstname.lastname@example.org)