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Disney Research

Wireless Communication and Mobile Computing

A Wireless Orientation Sensor Using Magnetoquasistatic Fields and Complex Image Theory

In this paper we report on a magnetoquasistatic orientation sensor that uses the magnetoquasistatic coupling between an electrically small emitting loop (magnetic dipole) and seven vertical receiving loops located on a circle of radius 12.19 m to determine the orientation of an object.

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Experimental Study on the Effects of Groups of People on Magnetoquasistatic Positioning Accuracy

In this paper, we present measurements using the magnetoquasistatic technique to show that the presence of a large group of 25 people introduces a peak distance error of less than 4.5 cm for an emitter-receiver distance of 10 m.

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Error Reduction in Magnetoquasistatic Positioning using Orthogonal Emitter Measurements

Measurements of the emitted magnetoquasistatic fields generated by a vertical emitting loop and detected at the terminals of seven fixed vertical receiving loops, all located above earth, are used to solve for position and orientation of the emitter.

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CAESAR: Carrier Sense-based Ranging in Off-the-Shelf 802.11 Wireless LAN

We implement CAESAR on commodity hardware and conduct extensive experiments both in controlled network conditions and dynamic radio environments.

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Managing Base Station Location Privacy

In this work we examine a software module that helps network operators to prevent third parties from aggregating wireless base station identifiers by making the identifiers dynamic.

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Performance of Collaborative GPS Localization in Pedestrian Ad Hoc Networks

In ad hoc networks without static nodes that could be used as reference points, mobile handhelds must rely on their GPS receivers to enable location-aware services.

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Wireless LAN in Paired Radio Spectrum with Downlink-Uplink Separation

This paper describes and evaluates the feasibility of a WLAN system operating in paired spectrum with a proof of concept implementation.

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A Dual-Radio Contention-based Protocol for Paired Spectrum Access and TV White Space

We investigate a contention-based 802.11-like protocol for paired spectrum.

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Transmit Diversity for Backscatter RFID: Preliminary Results

This project seeks to increase the power delivered to passive backscatter RF tags using transmit diversity – a method that uses multiple antennas and channel knowledge to deliver power to the tag.

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Experimental Demonstration of Transmit Diversity for Passive Backscatter RFID Systems

We have demonstrated an increase in the power incident on the RF tag using transmit diversity in a monostatic backscatter channel.

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