gr4-packet-modem: a QPSK packet modem for GNU Radio 4.0 (Daniel Estévez)

Daniel builds a full modem with GNU Radio 4.0:



gr4-packet-modem is a packet-based modem application that is being implemented from scratch for GNU Radio 4.0. The goal of this project is twofold: it serves as a use case to test and benchmark the GNU Radio 4.0 runtime in a realistic digital communications application, and it provides an example of a full system that users will be able to study and customize to their needs. The modem uses QPSK with RRC pulse-shape, but there are provisions for supporting additional MODCODs. It can work either in burst mode, where a packet is only transmitted when there is data, or in stream mode, where packets are transmitted back-to-back and idle packets are inserted when necessary. The modem can be used for IP communications with a TUN device in Linux. The receiver uses some advanced techniques, such as symbol time and carrier frequency and phase estimation with FFT-based syncword correlation.

In this talk I will present the architecture and functionality of the modem, and give an update and demo of the state of the work in progress. This work is funded by a grant from ARDC.

This talk took place on 2024-08-29 at GSI/FAIR Darmstadt, as part of the European GNU Radio days 2024.

Full talk details (including slides) are available at:
https://events.gnuradio.org/event/23/...