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UK Scientists Claim 1Tbps Data Speed Via Experimental 5G Technology
Mark.JUK writes A team of Scientists working at the University of Surrey in England claim to have achieved, via an experimental lab test, performance of 1Tbps (Terabit per second) over their candidate for a future 5G Mobile Broadband technology. Sadly the specifics of the test are somewhat unclear, although it's claimed that the performance was delivered by using 100MHz of radio spectrum bandwidth over a distance of 100 metres. The team, which forms part of the UK Government's 5G Innovation Centre, is supported by most of the country's major mobile operators as well as BT, Samsung, Fujitsu, Huawei, the BBC and various other big names in telecoms, media and mobile infrastructure. Apparently the plan is to take the technology outside of the lab for testing between 2016 and 2017, which would be followed by a public demo in early 2018. In the meantime 5G solutions are still being developed, with most in the early experimental stages, by various different teams around the world. Few anticipate a commercial deployment happening before 2020 and we're still a long way from even defining the necessary standard.
I think this busts the physics, unless I misunderstand completely. Paging Dr. Shannon...
Nope.
Think about baseband for a moment.
Let's say you hae a bandwidth of 100MHz.
You can basically change from 0v to 1v 100e6 times per second, giving 100Mbit/s.
But you can also introduce more symbols. If you have 10 voltage levels between 0 and 1 V you get 1Gbit /s.
What limits the number of symbols is noise. The datarate is symbol rate * bits per symbol. In the absence of noise, you can transmit an infinite amount of data in a 1Hz channel.
For non baseband signals, they generally use QAM to get symbols spanning the whole phase space around the centre frequency.
SJW n. One who posts facts.
Only 100 MHz, and using 100 MHz of spectrum. Most carriers in North America are lucky to have 10-20 MHz of contiguous spectrum, and maybe 40 MHz total usable spectrum in a specific area. Good luck finding 100 MHz of spectrum to use anywhere other than lab conditions.
Would be nice if they worked on increasing the number of bits that can be transferred per MHz of spectrum, instead of increasing the amount of spectrum required to send the bits.