OpenBTS-UMTS
gnuradio
OpenBTS-UMTS | gnuradio | |
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1 | 22 | |
52 | 4,830 | |
- | 1.4% | |
0.0 | 9.4 | |
9 months ago | about 21 hours ago | |
C++ | C++ | |
GNU Affero General Public License v3.0 | GNU General Public License v3.0 only |
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OpenBTS-UMTS
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Japanese phone workarounds (or, the irony of using more tech for less)
- Literally building a mini cellphone network with something like OpenBTS or updated variant. I don't even know if this is legal and would probably electrocute myself or crash planes, but the idea of software defined radio is interesting. I remember reading a comment somewhere from a developer building an analog phone to cell convertor. They said if you could convert analog signal to cellphone/vice versa, it's theoretically possible to convert it to anything you want.
gnuradio
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Upsampling in Gnuradio is necessary?
In gr-dtv transmitter examples for Gnuradio, I see some times people use a resampler block before the RF hardware sink. Say our sampling rate is ~9.14Msps which satisfies the Nyquist criterion because our samples are complex numbers.
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Capturing FM using SDR
2.1. Thanks for that tip, I forgot that I was able to check the source code of the WBFM Receive block. As you have said, there are mostly the same. There are some differences between how values are picked. The WBFM Receive block would be a synonym of Quadrature demod => Fir Filter (decimation => Low pass filter) => FM Deemphasis. 2.3. My question there is why 10 and not 20 or 100. I understand that the idea is to reduce the sample rate asap, but what I don't understand is why those values were picked and how can I understand what would be the "correct" or "best" value. 2.4. I'm not fully understanding what you said. If I check the WB FM recieve source code the values that are supplied as the cutoff freq and transition width of the Low pass filter differ from the one of the example. The webfm would apply a sample rate / decimation / 2 - sample rate / decimation / 32 as a cutoff freq and a sample rate / decimation / 32 as a transition transition width. Calculating those values would end up in different that the ones supplied in this second example. Again, is there a rule of thumb to pick these values?.
- Hello everyone! I would like to install and run GNU Radio version 3.7.4 in order to follow along with The HackRF GNU Radio tutorial on greatscottgadgets.com/sdr/ but I can’t find prior releases to install. Can anyone help?
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Multi band gfsk demodulation with Nooelec RTL-SDR v5 SDR and gnu radio
Gaussian filter is used only on the tx side, so specifying bt in the receiver makes no sense. Take a look at gfsk mod/demod blocks implementation: https://github.com/gnuradio/gnuradio/blob/master/gr-digital/python/digital/gfsk.py
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What would you rewrite in Rust?
GNU Radio
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Is there a way to delay a signal in time-domain?
Here's the filter coefficients used for the GNU-Radio interpolator block to get you started. This is a 7th order interpolator (i.e., 8 FIR taps) with very good performance. Each "row" of the array sets the delay in steps of sample_time / 128.
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My grandpa is a huge HAM radio fan, so I showed him GNU Radio. Got this text the day he got back home.
From their README: “open-source software development toolkit that provides signal processing blocks to implement software radios.” https://github.com/gnuradio/gnuradio
- The future is now ... again
- GNU Radio
- GNU Radio – the Free and Open Software Radio Ecosystem
What are some alternatives?
srsRAN_4G - Open source SDR 4G software suite from Software Radio Systems (SRS) https://docs.srsran.com/projects/4g
PothosSDR - Pothos SDR windows development environment
unlock_security_module - Unlock Linux security module such as TOMOYO, MIYABI, FJSEC, KCLSM and so on.
SDRPlusPlus - Cross-Platform SDR Software
gqrx - Software defined radio receiver powered by GNU Radio and Qt.
Node RED - Low-code programming for event-driven applications
gr-aoa - GNU Radio package implementing MUSIC and root MUSIC angle of arrival algorithms with blocks necessary to provide phase synchronization of USRP devices
gnss-sdr - GNSS-SDR, an open-source software-defined GNSS receiver
sdrangel - SDR Rx/Tx software for Airspy, Airspy HF+, BladeRF, HackRF, LimeSDR, PlutoSDR, RTL-SDR, SDRplay RSP1 and FunCube
CubicSDR - Cross-Platform Software-Defined Radio Application