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Repurposing millimeter-wave communication devices for high-precision wireless sensing

Repurposing millimeter-wave communication devices for high-precision wireless sensing

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This chapter presents two example system designs that enable passive sensing at super-resolution using commodity 60-GHz mmWave radios. The first system, mTrack, is a high-precision passive-object tracking system that uses 60-GHz signals as sensing medium. mTrack takes advantage of the short wavelength and steerable directional beams of 802.11ad-like 60-GHz radio devices, and uses subtle RSS/phase variation to track passive writing objects on a trackpad-like area. It can track a pen at sub-centimeter level accuracy, which even outperforms existing systems that use radio-instrumented objects. Considering the growing popularity of 60-GHz devices, we believe mTrack can potentially open up a wide range of mobile sensing applications. The second system, E-Mi, is a sensing-assisted paradigm to facilitate 60-GHz networks, whose performance is highly sensitive to reflectors. E-Mi senses the environment from 60-GHz radios' eyes. It “reverse-engineers” the geometry/ reflectivity of dominant reflectors, by tracing back the LoS/NLoS paths between a pair of 60-GHz nodes. Such environment information can be to augment a broad range of network planning and protocol reconfigurations.

Chapter Contents:

  • 13.1 Introduction
  • 13.2 mTrack: an overview
  • 13.3 Phase-based fine-grained mmWave tracking
  • 13.3.1 Basic successive tracking algorithm
  • 13.3.1.1 Translating phase change into path-length change
  • 13.3.1.2 From distance tracking to 2D tracking
  • 13.3.2 Tracking under background reflection
  • 13.3.2.1 Impact of background reflection on phase shift
  • 13.3.2.2 Phase counting and regeneration
  • 13.4 RSS-based APA
  • 13.4.1 Locating through discrete beam steering
  • 13.4.2 Background RSS subtraction
  • 13.4.3 Opportunistic calibration
  • 13.5 Implementation and evaluation of mTrack
  • 13.5.1 Implementation
  • 13.5.2 Performance on a trackpad
  • 13.5.2.1 Localization/tracking error across a large region
  • 13.5.3 Application of mTrack
  • 13.6 E-Mi: an overview
  • 13.7 Multipath resolution framework
  • 13.7.1 Estimate path angles using phased arrays
  • 13.7.2 Virtual beamforming: match path angles
  • 13.7.2.1 Beam generation
  • 13.7.2.2 Beam matching
  • 13.7.3 Multitone ranging: estimate path length
  • 13.8 Dominant reflector reconstruction
  • 13.8.1 Locating reflecting points in environment
  • 13.8.2 Reconstructing dominant reflector layout and reflectivity
  • 13.8.2.1 Reconstructing dominant reflectors' geometry
  • 13.8.2.2 Estimating reflection loss
  • 13.9 Implementation and evaluation of E-Mi
  • 13.9.1 Implementation
  • 13.9.2 Effectiveness of dominant reflector reconstruction
  • 13.9.2.1 Accuracy in localizing reflecting points
  • 13.9.2.2 Performance of dominant reflector reconstruction
  • 13.9.2.3 Accuracy of link performance prediction
  • 13.9.2.4 Scalability in complicated environment
  • 13.10 Summary
  • References

Inspec keywords: position measurement; radio tracking; object tracking; motion measurement; millimetre wave communication

Other keywords: mmWave radios; super-resolution; trackpad-like area; mobile sensing applications; passive sensing; LoS/NLoS paths; steerable directional beams; frequency 60 GHz; passive writing objects; 802.11ad-like radio devices; RSS/phase variation; E-Mi system; network planning; sub-centimeter accuracy; pen track; mTrack; high-precision passive-object tracking system; network protocol; dominant reflectors

Subjects: Spatial variables measurement; Radio links and equipment

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