imlibra/gr-dvbs2rx

DVB-S2 Receiver Extensions for GNU Radio

gr-dvbs2rx

Overview

gr-dvbs2rx is a GNU Radio out-of-tree (OOT) module with full DVB-S2 transmitter and receiver implementations for software-defined radio (SDR).

For the receiver side, this project includes a shared library with the essential signal processing blocks to process input IQ samples and recover an MPEG transport stream (TS) on the output. The processing blocks include:

• The physical layer (PL) synchronization stages (frame timing, symbol timing, carrier frequency, and phase recovery).
• Forward error correction (FEC) blocks.
• Baseband frame (BBFRAME) processing.

These blocks are wired together in the dvbs2-rx application and within the example GNU Radio flowgraphs.

Additionally, the project provides the dvbs2-tx transmitter application. While this OOT module focuses on the Rx signal processing blocks, the Tx blocks are taken directly from the gr-dtv in-tree GNU Radio module for digital TV. Like the Rx application, the dvbs2-tx application wires the Tx processing blocks together while offering a flexible user interface.

The Tx and Rx applications are highly customizable through the command-line options detailed in the usage section. For instance, they include customization of the input/output interface and parameters like MODCOD, frame size, PL pilots, and roll-off factor. Also, they support using SDR devices (RTL-SDR, USRP, PlutoSDR, and BladeRF) as input/output interfaces.

This repository is a fork of drmpeg's gr-dvbs2rx original project, including the SIMD-accelerated LDPC decoder from xdsopl/LDPC. Among a variety of improvements, this fork adds:

• The physical layer blocks required for a fully-fledged receiver.
• The flexible dvbs2-tx and dvbs2-rx command-line applications.
• A new BCH decoder implementation that is approximately 2.5x faster than the original (introduced in version 1.3.0)

License

The project is licensed under GPLv3 and was developed primarily for non-commercial research, experimentation, and education. Please feel free to contribute or get in touch to request features or report any problems.

User Guide

• Supported operation modes and limitations.
• Installation instructions.
• Usage instructions.

Main Authors

• Ahmet Inan
• Igor Freire
• Ron Economos

Further Information

• Igor Freire's talk at GRCon22: "gr-dvbs2rx: An Overview of the project state and path forward."