The workshop will cover many common techniques used to reverse engineer the physical layer of a wireless communications system:
- Blind signal analysis on a signals re-broadcast from a satellite transponder: modulation type, order, symbol rate, error correction,scrambling, differential coding, visualization
- Applying auto-correlation to interesting signals on the HF band: RADAR, OFDM, symbol timing
- Frequency hopping: wide-band, real-time spectrum visualization
All with GNU Radio!
Participants are advised to bring their own SDR to receive signals with, and have the very latest version of GNU Radio installed, and if they can manage also the gr-baz out-of-tree module.
Signal fundamentals
Properties that can be exploited for blind signal analysis
Modulation schemes
Periodicity in symbols
Repetition in frames
Bursty vs. continuous signals
Techniques
Auto-correlation
Cyclostationary analysis
Decoding
Demodulation
Common additions: scrambling, error correction
De-framing
Checksums
Enhancements (briefly)
Direction Finding
Physical layer fingerprinting
Advanced SDR with USRPs
Burst mode
Arbitrary sample rates
Digital tuning
Frequency hopping
Post time: Jun-20-2017