Slashdot Mirror
Researchers Set World Record Wireless Data Transmission Rate of 6 GB/Sec Over 37 KM (sciencedaily.com)
An anonymous reader quotes a report from Science Daily: Transmitting the contents of a conventional DVD in under ten seconds by radio transmission is incredibly fast -- and a new world record in wireless data transmission. With a data rate of 6 Gigabit per second over a distance of 37 kilometers, a collaborative project with the participation of researchers from the University of Stuttgart and the Fraunhofer Institute for Applied Solid State Physics IAF exceeded the state of the art by a factor of 10. The extremely high data rates of 6 Gbit/s was achieved by the group through efficient transmitters and receivers at a radio frequency of 71-76 GHz in the so-called E band, regulated for terrestrial and satellite broadcasting. The circuits are based on two innovative transistor technologies developed and manufactured by the project partner Fraunhofer IAF. In the transmitter the broadband signals are amplified to a comparatively high transmission power of up to 1 W with the help of power amplifiers on the basis of the novel compound semiconductor gallium-nitride. A highly directive parabolic antenna emits the signals. Built into the receiver are low-noise amplifiers on the basis of high-speed transistors using indium-gallium-arsenide-semiconductor layers with very high electron mobility. They ensure the detection of the weak signals at high distance. The transmission of high quantities of data by radio over large distances serves a high number of important application areas: the next generation of satellite communication requires an ever-increasing data offload from earth observation satellites down to earth. Supplying the rural area and remote regions with fast Internet is possible as shown in the trial. Earlier this year, engineers at the University of Illinois were able to set a record for fiber-optic data transmission, transmitting 57Gbps of error-free data at room temperature.
GB/sec != Gb/sec -PCP
Pedantic? Yep!
Necessary technical detail? Yep!
How necessary? 8 times as necessary!
6 GB/s is fucking awesome!
6Gb/s, not as impressive.
"Helping to keep you two steps ahead of the Thought Police!"
If only that was the only unit issue. Still, that one was so bad that I was initially interested, until I read through the summary and saw the different notation. Too bad, lets revisit in 10 years.
6 Gbps is slightly different, like, 8 times as different.
If we are going to get pedantic, let's go all the way: The bit rate (little b) generally includes protocol overhead (framing, ECC, handshaking, etc), while the Byte rate (big B) generally refers to only actual data. So the difference is not a factor of 8, but usually around 10.
Pedantic? Yep!
Necessary technical detail? Yep!
How necessary? 8 times as necessary!
6 GB/s is fucking awesome!
6Gb/s, not as impressive.
But if Comcast was selling it as a service, they would cap you after 3 seconds of full bandwidth use.
I should use this sig to advertise my book ISBN-13 : 978-1501515132.
So by the time this is done, it will have about the same transfer rate as a USB2 flash drive.
The world's burning. Moped Jesus spotted on I50. Details at 11.
Ah, thanks, I thought DVDs were getting bigger there for a second...or 10 seconds I guess.
Strange things are afoot at the Circle-K.
Unfortunately capital-B meaning bytes is not universal in all industries. In telecom I can't think of any time you would measure a data rate in bytes, it's usually the bit rate and sometimes the symbol rate.
“Common sense is not so common.” — Voltaire
Pretty obvious from the article that this is a single antenna. Wait until this is transferred to an ASIC and has multiple antennas. It could reach up to 24Gb/sec possibly. Of course won't have the same distance, but won't be surprised if this scales to over 20Gb/sec indoors. This is HUGE breakthrough. Congrats to all those involved with this!
If you consider most people are probably getting a speed nearer 25mb/s for their DSL and 100-200mb/s for their home wifi, then 6Gb/s is still pretty impressive over that distance, even if it is not GB/s. This could be really good for a mesh network, where you could be sharing videos with neighbours in a rural community.
Jumpstart the tartan drive.
The units are all messed up, the record has to be in bytes because we have relatively inexpensive 100Gbps commercial systems today using 4x 25Gbps as the carrier, there's no way the best lab system is only 2x the cots rate.
There are 4 boxes to use in the defense of liberty: soap, ballot, jury, ammo. Use in that order. Starting now.
Hey? Did anyone else notice the headline is wrong?
Great so now you can blow through your entire year of data in like 14 seconds of transfer, and AT&T can charge you like $10K in overages in less time than it takes to dial up support. T-Mobile will of course still offer unlimited data provided you don't actually transfer any because that will 'endanger' the stability of their network and you will be disconnected, plus incur premature contract severance fees. Cricket will of course offer a budget plan geared towards seniors who won't know any better. Tracfone will be illegal because it will require a DNA sample to buy a phone or any minutes...
Note : The above was intended for the purpose of satire and should not be taken literally...
errr....umm...*whooosh* *whoosh* Is this thing on ?
There is quite a difference between sending data via fiber optics over 10,000 feet or wireless over more than 20 miles.
6Gb/sec could be very useful for providing broadband to rural areas.
const int one = 65536; (Silvermoon, Texture.cs)
SJW, n: "Someone I don't like, and by the way I'm a fuckwit" - AC
The spectrum used by it is unlicensed because it is absorbed by the air's oxygen, if you look it up it's one of the spikes oxygen has on a graph. Long distance might not work at all (there might be some slack at the upper or lower range).
If the link can survive rain or mist for something line of sight and across the street(s) we'll be lucky enough. I don't know. Good thing is fallback to 2.4 or 5.5 is pretty much built-in if that's of use.
No idea about the power use (mobile battery life). The immediate usefulness is shit tons of very local spectrum i.e. the conference room and the living room ; beaming 1080p60 and such (interactive desktop or display, not a video)
6Gbps is about 2TB / hr.
Just put a 3TB HDD (or lots of DVDs) on a car and drive to the destination in half and hour, and you've achieved more than double the bandwidth :-P
It's very impressive indeed. Wireless point to point at that frequency is magical. We used to think 5GHz was heady stuff when we were developing the 802.11 specs. That's p-mp, but still, the front end devices dictate what's possible.
I should use this sig to advertise my book ISBN-13 : 978-1501515132.
It looks in the press release ( http://www.iaf.fraunhofer.de/e... ) that they've got about a 0.6m dish diameter, so at 4mm wavelength that's about 50dB gain and 0.5 degree beamwidth. Match that at the Rx end for 100dB total antenna gain. Use the full 1W Tx power they claim to have. Suddenly you've got a lot of room for loss in the channel.
Oh, I'm sorry sir, I thought you were referring to me, Mr. Wensleydale.
But, in telecom do they capitalize it?
Verizon doesn't:
http://www.verizon.com/home/fi...
AT&T doesn't:
https://www.att.com/internet/
So, who uses B when they should use b?
APK likes to ask for responses to the same things over and over. Maybe he just likes the responses?
As far as I know CCITT uses Mb/s universally in their documents. Which is far more compelling than your AT&T and Verizon examples.
That was kind of the point I was making. I don't know about the T1 jacks you have seen, but I haven't ever seen one that was labeled with MB or frankly Mb. Everywhere I know of the telecoms industry understands the difference, and to avoid lawsuits they try to use Mb where it applies.
APK likes to ask for responses to the same things over and over. Maybe he just likes the responses?