Phaser: Enabling Phased Array Signal Processing on

Commodity WiFi Access Points

 Mobicom 2014
In proceeding  

Abstract

Critical Issues of Antenna Arrays :
  • oscillators offsets
  • height difference between device & AP
  • Antenna on single commodity AP is limited

Target

  • Calibration between APs
  • low cost deployment of antenna arrays 

phase correction

fs : sampling frequency
fc : carrier frequency

ϕ: oscillator offset

γ: clock time offset

design


software correction (lab2 !!)


SOFTWARE CORRECTION (LAB2 !!)


Auto calibration


auto calibration


algorithm

target

get the best phase offset B that MAX  η 

Approach

consider several overlapping antenna arrays
optimize each subset, and sum all the subsets

parameters

σ of best sets

η of best sets

Cross packet correction


elevation compensation


Elevation steering



implementation & evaluation


Number of Aps


conclusion

  • multi-NIC operation
  • elevation difference compensation
  • auto-calibration

deck

By wally wei

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