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
