Re:5G researchers manage record connection speed
by femto on Wednesday February 25, 2015 @10:25PM
(#9111101)
It's a simulation [1]. The claim is that the technique is applicable to center frequencies below 6GHz and the 1Tbit/s used a bandwidth of 100MHz (for a spectral efficiency of 10^7 bit/s/Hz???). I'm guessing that whilst the technique might be applicable below 6Ghz, the 1TB/s rate isn't.
There are fundamental limits on the information capacity of an antenna using the EM spectrum [2], based on the surface area of the volume of space it occupies, in units of wavelength. (Related to the Holographic Principle?) I haven't done the calculation, to see if the claimed rate is within this limit, but a spectral efficiency of 10^7 bit/s/Hz is about 5 orders of magnitude beyond what others have reported (less than 100bit/s/Hz [3]). It will be interesting to see the details!
We’ve been finding the 1Tbps claim a little difficult to
digest and so have been prodding Professor Rahim
Tafazolli for further details, specifically a greater
clarification of how the performance was achieved.
According to Tafazolli, the new class of Detector (a
completely new approach) was tested through computer
simulations (these simulated a real mobile/wireless
environment) and were found to achieve the 1Tbps rate
claimed. In our view that’s quite a bit different from
conducting a practical test.
Next year Tafazolli said that his team would work to
implement this in a proper hardware/software platform and
test it in a real environment in the 5GIC outdoor testbed.
Hopefully they will be able to announce the performance in
2017."
There are fundamental limits on the information capacity of an antenna using the EM spectrum [2], based on the surface area of the volume of space it occupies, in units of wavelength. (Related to the Holographic Principle?) I haven't done the calculation, to see if the claimed rate is within this limit, but a spectral efficiency of 10^7 bit/s/Hz is about 5 orders of magnitude beyond what others have reported (less than 100bit/s/Hz [3]). It will be interesting to see the details!
[1] http://www.ispreview.co.uk/index.php/2015/02/university-of-s...
"UPDATE 25th Feb 2015
We’ve been finding the 1Tbps claim a little difficult to digest and so have been prodding Professor Rahim Tafazolli for further details, specifically a greater clarification of how the performance was achieved.
According to Tafazolli, the new class of Detector (a completely new approach) was tested through computer simulations (these simulated a real mobile/wireless environment) and were found to achieve the 1Tbps rate claimed. In our view that’s quite a bit different from conducting a practical test.
Next year Tafazolli said that his team would work to implement this in a proper hardware/software platform and test it in a real environment in the 5GIC outdoor testbed. Hopefully they will be able to announce the performance in 2017."
[2] http://arxiv.org/pdf/cs/0701055.pdf
[3] http://ieeexplore.ieee.org/xpl/articleDetails.jsp?reload=tru...