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A Testbed for Evaluation of the Effects of Multipath on Performance of TOA-based
Indoor Geolocation
Jie He, Student Member, IEEE, Kaveh Pahlavan, Fellow, IEEE, Shen Li, Student Member, IEEE, and Qin Wang
Presented by Yishuang Geng
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RSS based localization
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TOA based localization
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Why we choose TOA?1) GPS doesn’t work in indoor environment2) RSS based localization doesn’t have good precision
ApplicationShopping centerAirportHospitalFactoriesMuseum
Why we build testbed?3) Repeatable and controllable 4) Performance evaluation before deployement5) Facilitate algorithm design6) Disadvantage of transmitter/receiver taken into account
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Multipath condition
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Physical scenario of multipathFree spaceLine of sightNon Line of sight (a)Detected direct path (DDP)
(b)Undetected direct path (UDP)
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Overall architecture of the testbed
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Emulate Channel Model:
Channel emulator
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Channel emulator
Real timeSimulate up to 8 wireless channelsMultiple fading models70MHz bandwidth1ns time domain resolution
Intel core I7 with 8 high speed FPGA boardRunning Linux Ubuntu
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Ray tracing
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Ray tracing
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Testbed implementation
EmulatedImpulse Response
NanoLOC Nodes
PROPSim C8
Server
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Measurement scenarios
Free space: inside wireless chamberLOS: Room 233, 2nd floor, AK buildingNLOS-DDP: Room 320a, 3rd floor, AK buildingNLOS-UDP: Corridor 3rd floor, AK building
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Ranging algorithm
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Localization algorithm
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Localization algorithm
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Performance evaluation --- Ranging
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Performance evaluation --- Localization
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Conclusion
• The testbed can evaluate the performance of TOA-based indoor geolocation system in visible, controllable and repeatable emulated channel.
• The emulated performances are close to the performance of field test, that validates the effectiveness of the testbed in performance evaluation of TOA-based indoor geolocation.
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ThanksQuestions?