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German Researchers Hit 40 Gbps On Wireless Link
judgecorp writes "German researchers from the Fraunhover and Karlsruhe institutes have achieved 40Gbps transfers over 1km using a wireless link. The new record raises the hope that point-to-point wireless could be used instead of expensive fibers in some rural broadband applications."
Partially thanks to transmitting between 200GHz and 280GHz.
Here's another obligatory question
3. How many Australian Luddites care about what's happening in Germany?
Enquiring minds want to know
What part of "point to point" did you not understand?
1. How the hell is this going to fare in a real world test where a metropolis of people oversaturates the frequency?
From the summary.
...used instead of expensive fibers in some rural broadband applications
The higher the frequency, the more like light. It is a highly directional transmission, so unless there is another source of 200-280GHz signals within a few degrees of the transmitter sending in the direction of the receiver, there's not going to be interference.
When somebody tells you that fiber is a waste of money, ask them if we should stop building those expensive roads as well, because we can all fly helicopters instead.
Wireless LAN access points send at less than 1W (much less, depending on the regulatory domain), which is eventually converted to heat. Your brain on the other hand turns more than 10W of chemical energy into waste heat and you have only that stupid comment to show for it.
Well, I'm sure you've heard that Adolf Hitler was an Australian!
Religion is what happens when nature strikes and groupthink goes wrong.
This band is not useful for long haul carriage due to atmospheric water vapor absorption. According to this chart, absorption between 200 and 280 GHz varies between 3 and 40 dB/km. That means at the low end only 50% of your signal is absorbed every km. At the high end, only 1/10,000th of your signal remains after each km.
this post speaks to similar issues including refraction.
Tiller's Rule: Never use a word in written form that you've only heard and never read. You will end up looking foolish.
A 1km range is next to nothing for rural Australian
For Texans, 1 mile is "neighbors" . . .
. . . 100 miles is "just down the road" . . .
. . . 1000 miles is "just down the road, aways" . . .
Heh, I know people in the US like to think Texas is big, but the truth of the matter is that the area of the state of Texas is just under 700 thousand sq km, while the area of the state of Western Australia is a bit over 2.5 million sq km.
That's about 3.5 Texii*.
* I know - Texii probably isn't the correct plural for Texas, but Texases just sounded wrong.
You can never know everything, and part of what you do know will always be wrong. Perhaps even the most important part.