Download - WIFI Signal Emitter Identification
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802.11 Signal Emitter Identification
2007
Joel Kenny
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A Double Edged Sword
• Security Enhancement– Transparent Identification– Difficult to Circumvent
• Implications for Privacy– Less of it
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The ConstellationQuadrature
In-Phase
Phase Error
Fig. 2: Change in Magnitude
Fig. 3: Change in Phase
Magnitude Error
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Signal Emitter Identification
• Define Features of Transmissions
• Measure Captured Transmissions
• Use a Database to Profile Transmitters
IQ O
ffset
Phase Error
Fig. 4: IQ Offset vs. Phase Error
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GNU Radio PlatformComputer Running GNU Radio
USRP
usrp_src Blocks
USB
MoreBlocks
usrp_sink
SignalSink
SignalSource
Fig. 5: Photograph of the Universal Software Radio Peripheral
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802.11 Signal CaptureComputer Running GNU Radio
USRP
usrp_src DemodulationChain
USB
802.11Packets
BasebandSignal
Timestamp
Fig. 5: Photograph of the Universal Software Radio Peripheral
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Best Metrics
• Phase Error
• Magnitude Error
• IQ Offset
• Frequency Error
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Results / Work In Progress
• Preliminary Success with GNU Radio
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Future Research
• Development of New Metrics
• Multiple USRPs
• Research on Channel Characteristics