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AnonTechie writes:
According to an article from The Register, a team from Stanford University has patented technology that could halve the bandwidth that a mobile provider needs.
Operating under the name Kumu Networks, they are showcasing tech which they claim would exactly double throughput. Radio equipment (such as mobile phones) would be able to send and receive on the same frequency through a process similar to noise-cancelling headphones; by knowing what a base station is transmitting it can cancel out the information from the very faint signal it receives.
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Radio Tech Could Halve Bandwidth Needs
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(Score: 4, Informative) by mcgrew on Thursday February 27 2014, @05:53PM
Always getting shit wrong. It isn't anything like noise-cancelling headphones. From the non-retarded link: "Wireless Full Duplex allows a radio to simultaneously transmit and receive overlapping signals using a single frequency channel." What it cancels is interference the device itself produces, not external noise.
Before now, your phone's transmitter and receiver operated on different frequencies which is how it gets full duplex (full duplex is send and receive at the same time, for those poor souls who got here by mistake). This allows full duplex on a single frequency. There's an abstract linked which presumably explains how they do it but I haven't read it yet.
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(Score: 1) by hubie on Thursday February 27 2014, @06:24PM
So are they claiming double-throughput because you would still use two frequencies, but use them each full duplex?
(Score: 1) by adolf on Thursday February 27 2014, @07:39PM
No. They're claiming to double spectral the efficiency of a single frequency by allowing a radio to both transmit and receive on a singular frequency, without the local transmitter desensing the local receiver.
Of course it could use multiple carriers -- just as anything else could, from RF to Ethernet. That's a different issue.
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(Score: 4, Interesting) by frojack on Thursday February 27 2014, @08:38PM
I don't thing El Reg got it very far from wrong.
Noise canceling headphones have mic outside the earpiece which picks up ambient noise, and plays the inverse wave form inside the headphone cup, but at reduced power so that they cancel out what ever penetrates the cup.
This does something similar, it feeds what it is transmitting into the receiver, and subtracts it from what the receiver "hears". Its close enough to the exact same thing for the layman's explanation, (other than it happens in the receiver, and its only canceling its own signal).
Of course for this to work, the handset has to do the same thing, otherwise its transmissions would drown out its ability to hear the tower. (Even if the tower is much more powerful, having your own transmitter mere millimeters away from your receiver is a problem no matter how little your transmit power is.
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