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Jie He, Student Member, IEEE, Kaveh Pahlavan, Fellow, IEEE,

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.

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Jie He, Student Member, IEEE, Kaveh Pahlavan, Fellow, IEEE,

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  1. 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

  2. RSS based localization

  3. TOA based localization

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

  5. Multipath condition

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

  7. Overall architecture of the testbed

  8. Channel emulator Emulate Channel Model:

  9. 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

  10. Ray tracing

  11. Ray tracing

  12. Testbed implementation Emulated Impulse Response NanoLOC Nodes Server PROPSim C8

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

  14. Ranging algorithm

  15. Localization algorithm

  16. Localization algorithm

  17. Performance evaluation --- Ranging

  18. Performance evaluation --- Localization

  19. 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.

  20. Thanks Questions?

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