GNU Radio is a free & open-source software development toolkit that provides signal processing blocks to implement software radios. It can be used with readily-available low-cost external RF hardware to create software-defined radios, or without hardware in a simulation-like environment. It is widely used in hobbyist, academic and commercial environments to support both wireless communications research and real-world radio systems.

GNU Radio applications are primarily written using the Python programming language, while the supplied performance-critical signal-processing path is implemented in C++ using processor floating-point extensions, where available. Thus, the developer is able to implement real-time, high-throughput radio systems in a simple-to-use, rapid-application-development environment.

While not primarily a simulation tool, GNU Radio does support development of signal processing algorithms using pre-recorded or generated data, avoiding the need for actual RF hardware.

GNU Radio is licensed under the GNU General Public License (GPL) version 3. All of the code is copyright of the Free Software Foundation.

Core Framework Core contents.
pmt Polymorphic Types.
gnuradio.blocks Processing blocks common to many flowgraphs.
gnuradio.analog Blocks and utilities for analog modulation and demodulation. Blocks and utilities for digital modulation and demodulation. Blocks to connect to audio sources (mic-in) and sinks (speaker-out) ports on a computer.
gnuradio.channels Blocks for channel models and related functions.
gnuradio.comedi Blocks and utilities for COMEDI devices
gnuradio.fec Blocks for forward error correction.
gnuradio.filter Filter blocks and related functions.
gnuradio.trellis Blocks and utilities for trellis coding and related.
gnuradio.wavelet Processing blocks for wavelet transforms.
gnuradio.fft Fourier-transform blocks and related functions.
gnuradio.gr_unittest GNU radio specific extension of unittest.
gnuradio.qtgui Provides a GUI interface using the QT backend.
gnuradio.wxgui Provides a GUI interface using the Wx backend.

Hardware Interfaces

gnuradio.uhd Provides source and sink blocks to interface with the UHD library.
gnuradio.fcd Provides a source block for the FunCube Dongle hardware.


gnuradio.plot_data Utility to help plotting data from files.
gnuradio.eng_notation Display numbers as strings using engineering notation.
gnuradio.eng_option Add support for engineering notation to optparse.OptionParser

Framework Extensions

gnuradio.atsc Blocks and utilities for ATSC (Advanced Television Systems Committee) module.
gnuradio.noaa Blocks and utilities for NOAA app.
gnuradio.pager The GNU Radio pager application.
gnuradio.video_sdl Blocks and utilities for Video SDL module
gnuradio.vocoder This is the gr-vocoder package.

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