Wideband Power Line Positioning for Indoor Localization
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Wideband Power Line Positioning for Indoor Localization

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ubicomp2008 Wideband PowerLine Positioning for Indoor Localization - presented 09.23.2008 at UbiComp 2008, Seoul, Korea.

ubicomp2008 Wideband PowerLine Positioning for Indoor Localization - presented 09.23.2008 at UbiComp 2008, Seoul, Korea.

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Wideband Power Line Positioning for Indoor Localization Wideband Power Line Positioning for Indoor Localization Presentation Transcript

  • Wideband PowerLine Positioning for Indoor Localization
    • Erich Stuntebeck (Georgia Tech) - Shwetak Patel (U. Washington)
    • Thomas Robertson (Georgia Tech) - Matthew Reynolds (Duke)
    • Gregory Abowd (Georgia Tech)
  • Overview
    • Patel et al. ( UbiComp 2006) introduced PowerLine Positioning (PLP-I), a fingerprinting-based indoor localization system.
    • PLP-I Limitations
      • Sub-optimal frequency-pair selection.
      • Sensitivity to noise.
      • Temporal stability.
    • Solution: replace the frequency-pair approach with a wideband signal.
  • PLP-I Background S. Patel, K. Truong, G. Abowd. “ PowerLine Positioning: A Practical Sub-Room-Level Indoor Location System for Domestic Use ”, UbiComp 2006.
  • PLP Background
    • Amplitudes create a unique signature at every physical location.
    • Initial site survey required.
    • K-Nearest-Neighbors used for post-site-survey mapping.
  • PLP-I Status
    • Works as expected in residential environments and is currently undergoing commercialization.
    • Problems in commercial environments with lots of electrical equipment.
  • Our Test Environments Technology Square Research Building Georgia Tech Aware Home
  • Data Collection
    • 66 surveyed grid-points on a best-effort 0.9m x 0.9m grid.
    • 3 Levels of classification
      • Room
      • Sub-Room
      • Grid
    • 5 sweeps conducted over 2 months.
  • 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.
    Locator “tag”
  • Signal Injection
    • One signal injector located in the kitchen.
    • 40 signals (pure unmodulated carrier waves) tested ranging from 500 kHz to 20 MHz, plus 447/448/600/601 kHz.
    • All 44 tested frequencies injected in sequence from the indicated point.
  • 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.
    Patel et al. ’06 results 67% accuracy @ 1m 8.5 MHz, 9.0 MHz 8.5 MHz, 11.0 MHz 447 kHz, 11.5 MHz
  • 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.
    2 dB
  • How much noise exists?
  • How much noise exists? 5 Datasets over 2 Months
  • 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.
  • Wideband Results
  • Do you need 44 frequencies?
  • Wideband Noise Resistance Narrowband, 2 Frequency Wideband, 44 Frequency
  • Wideband Temporal Stability
  • Wideband Temporal Stability
  • Summary
    • PLP-I Limitations
      • Sub-optimal frequency-pair selection.
      • Sensitivity to noise.
      • Temporal stability.
    • Solution: replace the frequency-pair approach with a wideband signal.
  • Future Work
    • Further experimentation on temporal stability and accuracy vs. wideband signal size / frequency component spacing.
    • Other techniques for improvement in temporal stability?
      • Adaptive solution - continually monitor powerline noise.
  • Wideband PowerLine Positioning for Indoor Localization
    • Erich Stuntebeck
    • [email_address]