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