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OPTICAL VOICE AND DATA TOOLKIT
Neil Gandhi
Chris Hunold
Alex Grubl
Georgia Institute of TechnologyECE4007 L03 Senior Design
December 20, 2009
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PROJECT OVERVIEW
Use FSO communication to transmit voice, data
Provide secure alternative to radio frequency
Applied to military applications
Cost of $894.60 for parts
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PRIMARY OBJECTIVES
Communicate at distance of 20 meters Transfer data at rate of 2 Mbps Use eye-safe/covert light for communication Demonstrate proof of concept of technology
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OVERALL DESIGN APPROACH
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ENCODING VOICE AND DATA
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DATA FRAMING FOR TRANSMISSION
Framed layout of data
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DECODING VOICE AND DATA
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ENCODING/DECODING PROBLEMS
Manipulating hardware Combining voice & data Reduce bit error rate
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FREE SPACE OPTICAL TRANSMISSION
Current to voltage Amplifier chip Gain of 1000
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AMBIENT LIGHT
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FREE SPACE OPTICAL DETECTION
Frequency = 1 MHz
Period = 1 µs
Amplitude = 3.3 Vp-p
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DEMONSTRATION PLAN
Transmit unaltered voice from DE2 board ‘A’ to board ‘B’
Display image from SD card on LCD screen of DE2 board ‘B’
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PROJECT SCHEDULE
Encoding/decoding of voice and data Short-range signal detection Short-range communication Long-range signal detection Long-range communication
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CURRENT PROJECT STATUS
Short-range signal detection Working on encoding/decoding of voice and
data
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FREE SPACE OPTICS
Line-of-sight technology using beams of light to enable fiber-optic connectivity without physical wires.
~www.freespaceoptics.org