4 ms·

I would like anti-beamforming so I can create a wifi shadow and mess with people on my network.

• wnkrshm 4y ago
  You'd need to be connected to their wifi hardware to do that, since you wouldn't get interference between your beams and theirs without having two coherent sources.
• labcomputer 4y ago
  Already exists, it’s called MU-MIMO in the 802.11 world. Edit: Just to expand on this a bit… typically, the nulls of an antenna’s radiation pattern are sharper (in terms of dB per degree) than the peaks (and this is true for both phased arrays and traditional antennas). In other words, you can shape the beam to put one receiver in a very deep null while only slightly reducing the RSS at the other receiver. Do that for two beams at once, and each receiver gets (almost) as much power (from the intended beam) as they would if the beam were steered directly at it, while getting very little power from the other beam. Adding more elements to the TX side enables a greater number of and deeper nulls.
  • nemacol 4y ago
    Very interesting - I will do some reading on that. Thank you for the info!
• rasz 4y ago
  https://news.ycombinator.com/item?id=27133079 https://news.ycombinator.com/item?id=27133079 : https://ans.unibs.it/projects/csi-murder/ https://ans.unibs.it/projects/csi-murder/ enabled by https://github.com/open-sdr/openwifi https://github.com/open-sdr/openwifi Both partially funded by EU's Horizon2020 program. Openwifi talk at FOSDEM 2020 https://www.youtube.com/watch?v=8q5nHUWP43U https://www.youtube.com/watch?v=8q5nHUWP43U
  • nemacol 4y ago
    Very interesting. I will check out those links. Thank you. :D