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Wideband PowerLine Positioning for Indoor Localization

Wideband PowerLine Positioning for Indoor Localization. Ubicomp 2008 Presenter: Vincent. Outline. Overview PLP background Proposed Solution Test environment Wideband PLP Results Conclusion. Overview.

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Wideband PowerLine Positioning for Indoor Localization

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  1. Wideband PowerLine Positioning for Indoor Localization Ubicomp 2008 Presenter: Vincent

  2. Outline • Overview • PLP background • Proposed Solution • Test environment • Wideband PLP Results • Conclusion

  3. Overview • Patel et al. (UbiComp 2006) introduced PowerLine Positioning (PLP), a fingerprinting-based indoor localization system. • PLP Limitations • Suboptimal frequency-pair selection. • Sensitivity to noise. • Temporal stability. • Solution • replace the frequency-pair approach with a wideband signal.

  4. PLP Background

  5. PLP Background • Amplitudes create a unique signature at every physical location. • Initial site survey required. • K-Nearest-Neighbors used for post-site-survey mapping.

  6. 447 kHz, 11.5 MHz 8.5 MHz, 11.0 MHz 8.5 MHz, 9.0 MHz Classification Results • KNN classification of 66 grid-points using a K value of 1. • Frequency pairs chosen independently for each of the three granularities for worst and best cases. • Test and training data captured several hours apart.

  7. Noise Sensitivity • How sensitive is two-frequency amplitude data to noise? • Added zero-mean Gaussian noise. • Trained on the original uncorrupted data and tested on the corrupted data.

  8. How much noise exists?

  9. How much noise exists?

  10. Proposed Solution • Frequency pair approach suffers from poor performance and noise sensitivity. • Proposed solution: wideband signaling • Use all 44 tested frequency amplitudes for classification - 44 dimensional classifier space. (447kHz, 448kHz, 600kHz, 601kHz, 500kHz ~ 20MHz in 500kHz steps)

  11. Test Environments • 66 surveyed grid-points on a best-effort 0.9m x 0.9m grid. • 3 Levels of classification • Room • Sub-room • Grid

  12. Locator “tag” Measurement Apparatus • Software radio used to record raw over-the-air waveforms with a 64 MHz ADC. • Broadband loop-antenna used for prototyping speed and flexibility. • Necessary hardware has been reduced to portable size for deployments in the future.

  13. Wideband Results

  14. Do you need 44 frequencies?

  15. Wideband Noise Resistance Narrowband, 2 Frequency Wideband, 44 Frequency

  16. Wideband Temporal Stability

  17. Conclusion • PLP Limitations • Suboptimal frequency-pair selection. • Sensitivity to noise. • Temporal stability. • Solution • replace the frequency-pair approach with a wideband signal.

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