4 ms·
Researchers create super-efficient Wi-Fi
- sengstrom 11y agoWondering why the two passive devices have the same mac address...
- taterbase 11y agoNice catch, I haven't read the paper yet but I wonder if it belongs to the device generating the frequency.
- dogma1138 11y agoShouldn't since the passive devices build the packets the MAC is probably the same because it's they just copied the same exact fpga code on both devices. What wasn't clear and should be mentioned is that the active device doesn't have to transmit wifi at all it's just a source of random rf radiation at compatible frequencies since you craft packets by selective reflecting the signal.
- ptha 11y agoMentioned in the article is the passive bug the Soviets used for covert listening in the US embassy in Moscow. Impressive technology for 1945: https://en.wikipedia.org/wiki/The_Thing_%28listening_device%29 https://en.wikipedia.org/wiki/The_Thing_%28listening_device%...
- themadcreator 11y agoThe NSA ANT catalog of spy devices (leaked by Snowden) also includes cheap analog retro-reflectors: https://en.wikipedia.org/wiki/NSA_ANT_catalog https://en.wikipedia.org/wiki/NSA_ANT_catalog
- themadcreator 11y agoThis is pretty incredible, and congrats to the research team! But, could you please not use phrasing like "Reduces Power 10,000x". I don't think I'm the only that has an aversion to this: http://timesless.com/ http://timesless.com/
- thaumasiotes 11y agohttp://www.xkcd.com/169/ http://www.xkcd.com/169/ Get over yourself. In particular, your page of drivel goes wrong here: > "smaller than", "less than" etc. indicate subtraction, as in: 2 less than 10 is 8. Believe it or not, "smaller than" and "less than" are also used to refer to being smaller or lesser (go figure) in size or amount, as in "2 is less than 10".
- Angostura 11y agoThat's pretty rude. The poster was only asking for something that would improve clarity.
- thaumasiotes 11y ago> The poster was only asking for something that would improve clarity. This is not true. There is no issue of clarity if I say "the effect of losing a leg on quality-adjusted life years is four times smaller than the effect of smoking", or at least, no ambiguity about how the two numbers I'm thinking of relate to each other (numbers wholly invented). The poster was asking us to conform to his personal peeves.
- wongarsu 11y agoThat's a pretty simple special case of English language: if a reduction is indicated by a multiplicator greater one, the result is the same as multiplying by the multiplicative inverse of the number. So 10 reduced by factor 10,000 is clearly 10 * 1/10000 = 0.001.
- avian 11y agoWhile this is interesting work, I would say it's going into the wrong direction. It is simplifying the devices at the cost of less efficient use of the already crowded radio spectrum (the plugged-in device must transmit the carrier wave and the reflections from passive devices consume twice the spectrum due to mirror frequencies) Everyone else is going the other way: complicating devices to achieve higher spectrum efficiency. This approach might be sustainable for spy agencies, but I don't see how it could scale to mass deployment (especially with device densities predicted by IoT pundits these days).
- lucaspiller 11y agoThe same researchers released a video demonstrating the basics of this (though not with WiFi) a few years ago: https://www.youtube.com/watch?v=gX9cbxLSOkE https://www.youtube.com/watch?v=gX9cbxLSOkE https://homes.cs.washington.edu/~gshyam/Papers/amb.pdf https://homes.cs.washington.edu/~gshyam/Papers/amb.pdf
- stuaxo 11y agoWonder why they chose the UK "health lottery" - quite a small lottery, vs the UK National Lottery ?