The next big Wi-Fi standard is for sensing, not communication (2021)

Post by causi » Thu, Jan 13, 2022, 7:14 AM UTC

arijun wrote: post #127

causi wrote: post #72

Earlier quoted context omitted.

There's potential for visible-light networking but the Li-Fi people in particular are complete garbage. They claim visible light travels faster than radio waves and say Li-Fi is a hundred times faster than wi-fi but their thousand dollar router can only do 100Mb/s. They also rip off the Wi-Fi Alliance logo.

Which Li-fi people? AFAICT there are several groups, and li-fi.co (which I'll assume you're talking about) is less advertising for one specific group, and more advocating for the technology as a whole. > They claim visible light travels faster than radio waves I wasn't able to find it on the lifi website but seems like some poor copywriter got something wrong > their thousand dollar router can only do 100Mb/s Who's t…

Post by blurbleblurble » Sat, Jan 15, 2022, 12:54 AM UTC

Post by obmelvin » Tue, Jan 25, 2022, 8:05 PM UTC

tagoregrtst wrote: post #228

jagger27 wrote: post #221

Earlier quoted context omitted.

Yes, and? 5 and 6 GHz already struggle with thick walls (like those found between units in apartment buildings). Presence detection is one thing, but you can't see what I'm having for lunch through several walls with a single 2.4 GHz AP. 500 terahertz = 600 nm (visible light) 60 gigahertz = 5 mm 6 gigahertz = 50 mm 5 gigahertz = 60 mm 2.4 gigahertz = 125 mm

“Yes and” - Unless 2.4 and 5 GHz are taken off the standard, my router will see me through the walls. - At 60 GHz, if I have wifi, my router can see me - To make our concerns clear to you, even at 125 mm resolution, you can tell if I like my wife to drill my bottom with a strap on. Or you can tell if I piously say my prayers at night (something that is increasingly political). Or if the immigrant next door spanks his…