o ptical v oice and data toolkit neil gandhi chris hunold alex grubl georgia institute of technology...
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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
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
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
OVERALL DESIGN APPROACH
ENCODING VOICE AND DATA
DATA FRAMING FOR TRANSMISSION
Framed layout of data
DECODING VOICE AND DATA
ENCODING/DECODING PROBLEMS
Manipulating hardware Combining voice & data Reduce bit error rate
FREE SPACE OPTICAL TRANSMISSION
Current to voltage Amplifier chip Gain of 1000
AMBIENT LIGHT
FREE SPACE OPTICAL DETECTION
Frequency = 1 MHz
Period = 1 µs
Amplitude = 3.3 Vp-p
DEMONSTRATION PLAN
Transmit unaltered voice from DE2 board ‘A’ to board ‘B’
Display image from SD card on LCD screen of DE2 board ‘B’
PROJECT SCHEDULE
Encoding/decoding of voice and data Short-range signal detection Short-range communication Long-range signal detection Long-range communication
CURRENT PROJECT STATUS
Short-range signal detection Working on encoding/decoding of voice and
data
FREE SPACE OPTICS
Line-of-sight technology using beams of light to enable fiber-optic connectivity without physical wires.
~www.freespaceoptics.org