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 be
st 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
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