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Indoor Localization without Infrastructure using the Acoustic Background Spectrum Stephen P. Tarzia, Peter A. Dinda, Robert P. Dick, Gokham Memik MobiSys 2011 Jose Alvarez Sezaki Lab.

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Indoor Localization without

Infrastructure using the

Acoustic Background

Spectrum

Stephen P. Tarzia, Peter A.

Dinda, Robert P. Dick, Gokham

MemikMobiSys 2011

Jose Alvarez

Sezaki Lab.

Background & Objectives

Motivations

◦ Indoor Localization

◦ WiFi not always available and is not a

definite solution

◦ Improved accuracy

Background & Objectives

Related works

◦ Radio

Sensors as beacons

WiFi

◦ Other than radio

Accelerometer and Compass

SoundSense and SurroundSense

Background & Objectives

Distinctive elements of this method

◦ Transient noise v/s Background noise

=> Listen to background noises

◦ Look at frequency domain

Points of Interest

69% accuracy for 33 rooms

Implementation using smartphones

(Batphone in AppleStore)

Effectively combined sound technique

with WiFi

Proposed Method

Database side

◦ Training by gathering labeled samples (4

per room)

Client side

◦ Euclidian distance measure for selecting

candidates

Proposed Method

Results

Quality of the

recording device did

not impact accuracy

For 2 rooms

discrimination

accuracy goes up to

92%

Results

Chatter state

performance

drops

dramatically

Choosing

different

frequency band

helps in

conversation

state

Results

During the experiments the device

(Ipod touch) was with the screen on at

all times, with the brightness setting at

the dimmest => Battery life was 7.9

hours

11.5% CPU usage

16.7 MB of main memory

Battery life extended for a reasonable

time.

Why this method?

Indoor localization is not solved

completely yet

Using room’s acoustic fingerprint

seems like a creative method for room

identification

Hardware on smartphones is more

than enough for a feasible

implementation (Batphone)

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