Presented by Wosen Agedie and Samuel Walker Mentor: 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.

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.)

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 Generator 2. Cone-shaped antenna 3. USRP2 w/ WBX Daughterboard 4. Power Meter 5. NX Client 6. MATLAB 7. Microsoft Excel

WBX Daughterboard

 P rovide hardware platform for software radio  I t connects with the host computer using USB ot Gigabit Ethernet  U sually used with GNU radio software tool.  H as a motherboard wich provide the folowing subsystem : FPGA ( field-programmable gate array ) ADC ( analog-to-digital converter ) DAC ( digital-to-analog converter ) clock generation

Signal Generator USRP Laptop Rx Calibration Diagram Laptop USRP Power Meter Tx Calibration Diagram

First FloorSecond 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 building  The floor with the highest peak is where the transmitting device is located  The nodes with the highest power levels shows the vicinity of where the transmitter is located

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.

 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

 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 Tech Published by IEEE Communications Magazine