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Wireless Network Location Verification
Presented by Wosen Agedie and Samuel WalkerMentor: Dr. Beex
The purpose of this project is to come up with a model to accurately locate where a transmitting device is indoors where Global Positioning Systems cannot by using an indoor wireless network.
Project Background
1. 9-1-1 Emergency Personnel who need to locate a victim trapped in a building
2. Parents who need to locate their child in a crowded, large building (mall,
museum, etc.)3. Locate lost personal items (cell phone,
keys, etc.)
Future Applications
Cognitive Radio Network Testbed
Gigabit Ethernet: interface between USRP2 (installed in the ceiling) and the processing platform.
12 nodes per floor for a total of 48 wireless nodes, each node is connected to a server
1. Signal Function Generator2. Cone-shaped antenna3. USRP2 w/ WBX Daughterboard4. Power Meter 5. NX Client6. MATLAB7. Microsoft Excel
Equipment/Software Used
Signal Function Generator
Setup Configuration
USRP2 WBX Daughterboard
Universal Software Radio Peripheral (USRP)
Provide hardware platform for software radio
It connects with the host computer using USB ot Gigabit Ethernet
Usually used with GNU radio software tool.
Has a motherboard wich provide the folowing subsystem:
FPGA ( field-programmable gate array) ADC ( analog-to-digital converter )
DAC (digital-to-analog converter )
clock generation
Power Meter
Calibration Method
Signal Generator
USRP Laptop
Rx Calibration Diagram
Laptop USRP Power Meter
Tx Calibration Diagram
Calibration Graphs
-80 -75 -70 -65 -60 -55 -50 -45 -400
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
f(x) = NaN x^NaNR² = NaN
f(x) = 71287.5126493625 exp( 0.229567784673106 x )R² = 0.999329076712998
Rx Calibration
Signal Generator Power (dBm)
Rece
ived P
ow
er
of
USR
P (
dW
)
0 5 10 15 20 25 30
-30
-25
-20
-15
-10
-5
0
5
10
f(x) = 0.0000416494 x⁵ − 0.0027469 x⁴ + 0.0678599 x³ − 0.861548 x² + 7.35998 x − 34.4997R² = 0.992683052961027
Tx Calibration
Transmitter Gain (dB)
Po
we
r M
ete
r M
ea
sure
d P
ow
er
(dB
m)
Testing Results
0 5 10 15 20 25 30 35 40
-75
-70
-65
-60
-55
-50Frequency: 766 MHz and Power Level: -1 dBm
Node #
Pow
er
Level (d
Bm
)
Third FloorFirst Floor Second Floor
When each power level from nodes are plotted in order from 1-48:We can easily spot the highest peak
between the four floors of the buildingThe floor with the highest peak is where the
transmitting device is locatedThe nodes with the highest power levels
shows the vicinity of where the transmitter is located
Localization Model
1. Transmitter power level is very important in order to locate a transmitter. The lower the power level, the harder it is accurately pinpoint the vicinity of the transmitter.
2. The position and number of nodes used to locate a transmitter is very important. The more nodes that are utilized, the more accurate the transmitter’s location.
Things Learned
Find the minimum power level required to accurately locate a transmitter
Find the minimum number of nodes and the distances between each one to accurately locate a transmitter
Future Work
Dr. Beex and Tamoghna Roy (Mentors)Dan Depoy (CORNET Administrator)Dr. Dietrich (Hardware and Supplies)
“Designing and Deploying a Building-Wide Cognitive Radio Network Testbed” Authors: Timothy R. Newman, S. M. Shajedul Hasan, Daniel DePoy, Tamal Bose, and Jeffrey H. Reed, Virginia TechPublished by IEEE Communications Magazine
Mentors and References
???Questions???
Floor 2 (ICTAS Building)