The Cricket Location-Support System

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# The Cricket Location-Support System - PowerPoint PPT Presentation

The Cricket Location-Support System. By: Min Chen 10/28/03 . Goal. User Privacy Decentralized administration Network heterogeneity Low cost Room-sized granularity. System Architecture. Beacon: Disseminate the string of space information about a geographic space to listeners.

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Presentation Transcript

### The Cricket Location-Support System

By: Min Chen

10/28/03

Goal
• User Privacy
• Network heterogeneity
• Low cost
• Room-sized granularity
System Architecture
• Beacon:

Disseminate the string of space information about a geographic space to listeners.

• Listener: Infer its current location from the set of beacons .

Approach

Use combination of RF and ultrasound to provide a location-support service to users.

Related Problem and Method
• Collision of RF transmissions from different beacons

------------Randomization

• Wrong correlation of the RF data of one beacon with the ultrasonic signal of another

------ System parameters

------ Listener Inference Algorithms

Interference Scenarios
• RF-A:US-RA
• Align the beacons
• RF-A:US-I
• Using RF signal with long range
• RF-A:US-RI
• Ensure less than 5 beacons within range of each other
Listener Inference Algorithm
• Majority
• Picks the beacon with highest frequency of occurrence
• MinMean
• Selects the beacon with the minimum mean value
• MinMode
• Compute the per-beacon statistical mode over the past n samples.