4 ms·

> (though I still don't appreciate how this would practically be done to the existing hardware, and they apparently only simulated this with software-defined ra

by keeda 2y ago

> (though I still don't appreciate how this would practically be done to the existing hardware, and they apparently only simulated this with software-defined radio). It is my understanding that most modern baseband chips can effectively be considered "software defined radios", as most of the modulation/demodulation is performed by the firmware. While the researchers appear to have used a USRP (a dedicated SDR platform), it is conceivable their scheme could be accommodated in the firmware.

walterbell 2y ago
> most modern baseband chips can effectively be considered "software defined radios" Is there a comparably-priced SDR that could be used for WiFi data transmit/receive with GNUradio?
- keeda 2y ago
  I'm not sure what you are asking it should be comparably priced to, but USRPs are on the higher end of the cost spectrum. Caveat: my experience here is extremely limited, but at one point I too was looking into affordable GNURadio-compatible SDR hardware that could transmit and receive (as opposed to the RTL-SDRs that can only receive) and I came across options like HackRF and LimeSDR. However, knowledgeable people also pointed out that these cheaper options make tradeoffs in the RF hardware that make it harder to get reliable performance for non-trivial uses. Their opinion was that the time saved in working around those limitations was well worth the extra cost of a USRP.
  - stogot 2y ago
    Are there mapped communities if SDR folks who I can connect with and want to build off-grid networks? I’d be interested in pursuing this
  - femto 2y ago
    The BladeRF and ADALM-PLUTO are cheaper alternatives to the entry level (B2xx) USRPs. They use the same Analog Devices MIMO chip as the USRP, so are similar in capability.
- AleaImeta 2y ago
  As far as I know, transmitting and receiving Wi-Fi traffic will never be possible using GNUradio, because you cannot meet the maximum 16 microsecond latency for sending an acknowledgment after you decoded a packet successfully. It's possible with an FPGA-based software-defined radio though: https://github.com/open-sdr/openwifi https://github.com/open-sdr/openwifi

by keeda 2y ago

walterbell 2y ago

> most modern baseband chips can effectively be considered "software defined radios" Is there a comparably-priced SDR that could be used for WiFi data transmit/receive with GNUradio?

keeda 2y ago
I'm not sure what you are asking it should be comparably priced to, but USRPs are on the higher end of the cost spectrum. Caveat: my experience here is extremely limited, but at one point I too was looking into affordable GNURadio-compatible SDR hardware that could transmit and receive (as opposed to the RTL-SDRs that can only receive) and I came across options like HackRF and LimeSDR. However, knowledgeable people also pointed out that these cheaper options make tradeoffs in the RF hardware that make it harder to get reliable performance for non-trivial uses. Their opinion was that the time saved in working around those limitations was well worth the extra cost of a USRP.
- stogot 2y ago
  Are there mapped communities if SDR folks who I can connect with and want to build off-grid networks? I’d be interested in pursuing this
- femto 2y ago
  The BladeRF and ADALM-PLUTO are cheaper alternatives to the entry level (B2xx) USRPs. They use the same Analog Devices MIMO chip as the USRP, so are similar in capability.
AleaImeta 2y ago
As far as I know, transmitting and receiving Wi-Fi traffic will never be possible using GNUradio, because you cannot meet the maximum 16 microsecond latency for sending an acknowledgment after you decoded a packet successfully. It's possible with an FPGA-based software-defined radio though: https://github.com/open-sdr/openwifi https://github.com/open-sdr/openwifi