Comment on Wifi 15 gigabytes per second — Researchers demo invention
n3m37h@sh.itjust.works 1 week ago
The triangle of compromise
Speed
Bandwidth
Range
You cant have all 3. Just like manufacturing
Speed and bandwidth are the same thing. Power is the other side of that triangle.
But that ignores encoding, and other tricks like signal shaping, frequency multiplexing, and all kinds of fun stuff. Wireless data transmission is complicated. For example: en.wikipedia.org/…/Quadrature_amplitude_modulatio…
Speed and bandwidth correlate but aren’t the same. Bandwidth is the amount of data that can pass through a medium and speed is the transmission rate. If you have a gig connection and one device, you can get close to gig speeds. If you have the same gig connection with 1000 devices saturating the medium, you aren’t likely to get gig speeds.
Sorry ment power, bandwidth, range
felixwhynot@lemmy.world 1 week ago
To be fair most wifi is used within homes or businesses these days so I would simply sacrifice range — as long as the minimum range is reasonable
ColeSloth@discuss.tchncs.de 1 week ago
The issue will be less about “range” and more about being able to go through a wall. Higher frequency makes for shorter radio waves that are closer together. The more this is done, the less it can go through solid objects and still be decipherable.
It’s like a sound wave. That big low frequency bass sound can shake your walls while playing from in your neighbors house. You can’t make out or hear a single word being sung, though. Frequency is too high to make it through to you.
This tech can be nicely used for wireless VR and maybe a couple other things that need to move data at super low latency at a local level, but beyond that, it will be kind of useless for anything over the next decade.
n3m37h@sh.itjust.works 1 week ago
5G mm wave can be blocked by paper ffs, range doesnt matter if a leaf can block the line of sight. Idk why we can use the low bandwidth long range 900-1200mhz and just use an array of atenna send out multiple channels to increase bandwidth. I’d prefer range over bandwidth I wont utilize
felixwhynot@lemmy.world 1 week ago
Tried to fact check this but I can’t find evidence that 5g can be blocked by paper. Looks like it’s in 24-28ghz and while it can be blocked with materials the density matters. So maybe like a few books thick of paper but not one sheet?
jj4211@lemmy.world 1 week ago
Note that this demo takes things over 100ghz. So the challenges associated with mmwave (and wigig) are even more.
n3m37h@sh.itjust.works 1 week ago
Was being hyperbolic m8. The human body will block mmwave