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Maximum Practical Datalink Spectral Efficiency

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ogden:

--- Quote from: coppice on June 14, 2019, 11:42:47 am ---Did you miss "MIMO"?

--- End quote ---

Sorry? What you are talking about? - Fact that I did not retype "MIMO" mentioning 50bits/Hz E-band or what? If yes - then better delete your pointless post now, so I can delete this one.

ogden:

--- Quote from: TheUnnamedNewbie on June 14, 2019, 11:52:23 am ---https://www.ericsson.com/en/press-releases/2019/5/deutsche-telekom-and-ericsson-top-100gbps-over-microwave-link

I can't give you more on the other stuff since it is what I hear from certain industry partners I work with, without necessarily having official statements out there. I work in the millimeter-wave communication industry myself so I do not necessarily get a lot of information like this in public statements.

--- End quote ---

Thank you, very interesting info. Not so long time ago 1Gbs E-band was "big thing" :D Do you know something about "line of sight MIMO"? Is it so that antennas are so good that they just run 4 parallel cross-polarized beams w/o any actual MIMO DSP math in the modems?

coppice:

--- Quote from: ogden on June 14, 2019, 12:10:26 pm ---
--- Quote from: coppice on June 14, 2019, 11:42:47 am ---Did you miss "MIMO"?

--- End quote ---

Sorry? What you are talking about? - Fact that I did not retype "MIMO" mentioning 50bits/Hz E-band or what? If yes - then better delete your pointless post now, so I can delete this one.

--- End quote ---
The potential of MIMO, given enough room for the antennae, is so huge that 50 bits/Hz just takes effort, but little innovation, to achieve. So far MIMO has mostly been restricted in its effectiveness because the applications so far using it are mostly small devices.

TheUnnamedNewbie:

--- Quote from: ogden on June 14, 2019, 12:24:17 pm ---
--- Quote from: TheUnnamedNewbie on June 14, 2019, 11:52:23 am ---https://www.ericsson.com/en/press-releases/2019/5/deutsche-telekom-and-ericsson-top-100gbps-over-microwave-link

I can't give you more on the other stuff since it is what I hear from certain industry partners I work with, without necessarily having official statements out there. I work in the millimeter-wave communication industry myself so I do not necessarily get a lot of information like this in public statements.

--- End quote ---

Thank you, very interesting info. Not so long time ago 1Gbs E-band was "big thing" :D Do you know something about "line of sight MIMO"? Is it so that antennas are so good that they just run 4 parallel cross-polarized beams w/o any actual MIMO DSP math in the modems?

--- End quote ---

I'm not someone working on MIMO myself, but I have seen reports (again, unfortunately no official statement) of antennas with gain north of 45 dBi on both ends. Things like active stabilizing because the wind sway of the supports brings them out of alignment.

NiHaoMike:
I have managed to send 600Mbps through a single pair of telephone line a few hundred feet long using a $20 pair of hacked Homeplug adapters. Those adapters used 12V output amplifiers so there's quite a bit of room to further boost SNR while staying within the low voltage limit. (More for longer range than more bandwidth, so using a higher voltage is more interesting to telecommunications companies than hobbyists.)

--- Quote from: TheUnnamedNewbie on June 14, 2019, 03:34:35 pm ---I'm not someone working on MIMO myself, but I have seen reports (again, unfortunately no official statement) of antennas with gain north of 45 dBi on both ends. Things like active stabilizing because the wind sway of the supports brings them out of alignment.

--- End quote ---
Even a fairly small dish antenna like the ones used for residential satellite communications are on the order of 30dBi or more. The really big ones used for radio astronomy can do as much as 80dBi.
https://en.wikipedia.org/wiki/Parabolic_antenna#Gain

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