A Testbed for Evaluation of the Effects of Multipath on Performance of TOA-based Indoor Geolocation Jie He, Student Member, IEEE, Kaveh Pahlavan, Fellow,

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Presentation transcript:

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

RSS based localization

TOA based localization

Why we choose TOA? 1)GPS doesn’t work in indoor environment 2)RSS based localization doesn’t have good precision Application Shopping center Airport Hospital Factories Museum Why we build testbed? 1)Repeatable and controllable 2)Performance evaluation before deployement 3)Facilitate algorithm design 4)Disadvantage of transmitter/receiver taken into account

Multipath condition

Physical scenario of multipath Free space Line of sight Non Line of sight(a)Detected direct path(DDP) (b)Undetected direct path(UDP)

Overall architecture of the testbed

Emulate Channel Model: Channel emulator

Real time Simulate up to 8 wireless channels Multiple fading models 70MHz bandwidth 1ns time domain resolution Intel core I7 with 8 high speed FPGA board Running Linux Ubuntu

Ray tracing

Testbed implementation Emulated Impulse Response NanoLOC Nodes PROPSim C8 Server

Measurement scenarios Free space: inside wireless chamber LOS: Room 233, 2 nd floor, AK building NLOS-DDP: Room 320a, 3 rd floor, AK building NLOS-UDP: Corridor 3 rd floor, AK building

Ranging algorithm

Localization algorithm

Performance evaluation --- Ranging

Performance evaluation --- Localization

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.

Thanks Questions?