Re:5G Network end-to-end demonstration by Ericsson
by wbl on Thursday February 16, 2017 @03:27PM
(#13663281)
The Shannon-Hartley theorem is a harsh master. You cannot squeeze more then bandwidth times log 1+S/N through a radio link. You cannot have antenna gain beyond the diffraction limit. Power amplifiers have limited bandwidth.
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Re:5G Network end-to-end demonstration by Ericsson
by zanny on Saturday February 18, 2017 @01:56AM
(#13673906)
Which is exactly why the law is the limiting factor rather than physics.
We have the ability to programmatically build radios that can adjust bandwidth channels on demand, in fairly broad ranges. But because spectrum is treated as a commodity to be owned by private entities, nobody can utilize the potential of load balancing across all possible radio spectrum (both immediately and in macroscopic economic trends).
If we are stuck with the ~800mhz combined spectrum openly available today, of course we will continue to see incredible bottlenecks in congested wireless environments. But in practice there is about ~10ghz of practically usable spectrum for wireless data transfer, and you can fit a lot more channels in the low end.