Software-defined radio, also referred to as SDR, is an approach to radio systems where hardware components are replaced with software.
Tutorials
General DSP stuff
- https://pysdr.org/
- Clock Recovery and Synchronization
- Costas Loop Demodulator
- FSK Modulation and Demodulation
- Spread Spectrum Modulation and Demodulation
- The simplest BPSK DSSS Radio Beacon with SDR demodulation
GNU Radio
- https://blog.habets.se/2017/04/Decoding-FSK.html
- https://wiki.gnuradio.org/index.php?title=QPSK_Mod_and_Demod