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Chinese Researchers Transmit 150 Mb/s Over Li-Fi

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October 27, 2013 7:14:39 PM

They use FPGA chip in wifi protocol transfer with that speed. I don't know that TI DSP can handle with that speed or not?
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October 27, 2013 7:19:45 PM

So someone is still on a Moon?
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October 27, 2013 7:31:33 PM

So now your telling me that i have to replace everything in my house that uses wi-fi to li-fi? Thanks for the warning...
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October 27, 2013 7:55:48 PM

I quite like the sound of this. LiFis greatest weakness sounds to me like it's greatest strength: the whole line-of-sight thing. WiFi as it is now is horrendously overcrowded, there are 53 different access point within range of my home, all sharing the same 11 channels, if one or more of my neighbors decides to watch netflix, guess what? - no more internet for you (basically I get kicked off and/or have virtually non existant transfer speeds). This is only on 2.4ghz mind you, 5ghz is virtually empty - but for how long? With line of sight, LiFi will have some hurdles to overcome, but, within ones own home, overcrowding shouldn't ever be a problem.
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October 27, 2013 7:59:55 PM

sean1357 said:
They use FPGA chip in wifi protocol transfer with that speed. I don't know that TI DSP can handle with that speed or not?


Anything that can be done on an FPGA can be done more efficiently as an ASIC. FPGAs are simply used to prototype logic (subject to the FPGA's own limitations) as it can be reconfigured simply by recompiling the design. This is useful for working out bugs before sending the design off for fabrication.
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October 27, 2013 8:11:02 PM

The problem with LiFi is exactly that. The use of light. Since it has line of sight restrictions, it will be extremely difficult, if not impossible to use in most locations.
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October 27, 2013 8:16:41 PM

I'm holding out for PiFi... because I like pie.
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October 27, 2013 8:18:14 PM

The material response time/scattering are the key challenges when it comes to laser transmission. I am far more impressed with NASA whopping 622 MB/s than the earthling 1 Gb/s...
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October 27, 2013 9:02:14 PM

So. Now we now need to utilize this with a fusion reactor as the EMI from a nuclear fusion reaction would mess with conventional hard wired or radio based data transfer. Then place this fusion reactor on the Tibetan plateau and power the Eurasian continent for the next 50 years.
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October 27, 2013 9:45:09 PM

Is it pronounced Lye-Fi? I'll just called it Leafy.
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October 27, 2013 10:01:58 PM

so it's slower and less practical than wifi.
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October 27, 2013 11:23:26 PM

tanjali said:
So someone is still on a Moon?


Probably streaming some porn.
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October 27, 2013 11:37:07 PM

would you like fri-ri with your li-fi?
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October 28, 2013 1:03:04 AM

The best application of this is you can use the LED's use in LiFi as room lighting same time.

The fast blinking of the data carrier frequency is well beyond human perception.
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October 28, 2013 1:16:12 AM

So what happen when someone is standing between your device and the router? Your Netflix suddenly turn to photobucket?
Well, we will need a lot of mirror in our house...
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October 28, 2013 2:48:26 AM

If only there were some sort of flexible, transparent, fiber cable that we could use to channel the light between the communicating devices...
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October 28, 2013 5:39:33 AM

deftonian said:
I'm holding out for PiFi... because I like pie.


Mmmmmm, this pumpkin pie is full of so much delicious information!

... How much pie to I need to eat to learn kung fu?
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October 28, 2013 5:50:05 AM

xiinc37 said:
I quite like the sound of this. LiFis greatest weakness sounds to me like it's greatest strength: the whole line-of-sight thing. WiFi as it is now is horrendously overcrowded, there are 53 different access point within range of my home, all sharing the same 11 channels, if one or more of my neighbors decides to watch netflix, guess what? - no more internet for you (basically I get kicked off and/or have virtually non existant transfer speeds). This is only on 2.4ghz mind you, 5ghz is virtually empty - but for how long? With line of sight, LiFi will have some hurdles to overcome, but, within ones own home, overcrowding shouldn't ever be a problem.


Not as many hurdles as you might think. There was a neat TED Talk (last year I think?) about using LED house lights as a transmitter of data throughout a home. The variation in light is so fast and subtle that you would never pick it up with your eyes, and it can operate at such low light that it can still work while in practical darkness.

The thought would be to get your router, plug an Ethernet port into some sort of power-line modulator, and then use special light-bulbs that have the capability to both send and receive signal. Or perhaps make a hybrid system where wifi is used for upstream communication and lifi is use for downstream communication which would make the light bulbs substantially cheaper, and get around the bulk of the traffic which congests apartment complexes.

Anywho, I still think wired networking is the way to go whenever possible. Wireless communication should be reserved for low bandwidth portable devices.
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October 28, 2013 5:57:25 AM

This tech will be useless for most applications aside from theoretical, same as using infrared for printing and data communications. It will be put into devices, no-one will use it. Only good thing is having your laptop and TV in communication if they can work out a way to send HDMI data using this. Line of sight limits this too much, at least the bandwidth is usable unlike what the infrared stuff was.
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October 28, 2013 7:27:14 AM

This uses LED room lighting so it would be using MIMO of course so there would be multiple data paths. You don't always have to point your remote directly at your device to make it work. For sure this is meant not replace WIFi or Bluetooth or anything else, unless they can figure out how to modulate sun/moonlight or streetlights.
Imagine the potential of any 'digital' light source carrying data - Car Lights, Store Signage, Traffic Lights - Not necessarily internet but application specific data.
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October 28, 2013 7:35:51 AM

I LOVE the line at the very end! Oh and by the way, NASA completely blows this story out of the water! Classic!
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October 28, 2013 10:16:16 AM

Moon, huh? How was the latency?
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October 28, 2013 10:33:24 AM

Correct me if I'm wrong.

Not exactly new. This is basically just optical-fiber technology but using air as medium?
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October 28, 2013 10:35:22 AM

testing
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October 28, 2013 11:32:18 AM

Correction: The article reads 622 MB/s to and from the moon using lasers. NASA actually only managed 622 MEGABITS per second, not MEGABYTES. If it were 622 MB/s, they would need a laser capable of switching on/off at least 5 billion times a second, that's with no error correction coding.

SOURCE: http://www.engadget.com/2013/10/24/nasa-llcd-data-trans...
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October 28, 2013 11:36:31 AM

childofthekorn said:
Moon, huh? How was the latency?


One way to the moon is 1.282 light seconds at average distance, so assuming things go at light speed without issues, about 3,000ms.
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October 28, 2013 2:53:22 PM

Wifi uses radiowaves, which is a kind of "light" itself.
Normally light is referred to ones in or near the visible spectrum. Li-fi seems much more supceptible to interference.
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October 28, 2013 3:17:16 PM

that doesn't sound practical. using light beams means it can't go through walls, which means you still have to use wires or wifi to get your internet around the house. so why not just use wires or wifi?
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October 29, 2013 12:52:11 AM

Pardon my stupidity, but LiFi needs line of sight but is secure. Cat 6/7 is blinding fast and doesn't need line of sight and is secure. It's a great concept but how many people are really going to use it? Does it work through thick glass say in a secure room with an infectious disease that you're not going to run a LAN cable in and the Wifi isn't penetrating?
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October 29, 2013 9:38:08 AM

Seeing this new technology, and learning that NASA transmitted 622MB/s!!! All the way to the fricken moon using lasers, gives me slight more hope for humanity.
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October 29, 2013 5:40:25 PM

um "" Maby they use mirror prizumes to bend the light to little mirror's around the house.
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October 29, 2013 5:42:19 PM

and the light has to be inadvisable or it will look like a disco ball room .good luck with that
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October 29, 2013 11:22:29 PM

mman74 said:
Pardon my stupidity, but LiFi needs line of sight but is secure. Cat 6/7 is blinding fast and doesn't need line of sight and is secure. It's a great concept but how many people are really going to use it? Does it work through thick glass say in a secure room with an infectious disease that you're not going to run a LAN cable in and the Wifi isn't penetrating?


You should know by now that you cannot have that mentality when it comes to technological advances. What seems impractical, useless, "never going to be used", could be the norm 10 years from now lol.
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