SR71 MIMO vers Mikrotik Atheros Nstream

[wispwest]

Hey does anyone know what would be best for backhaul with using only single antenna's on each side as to having to use dual? Right now we have a Mikrotik Atheros card pushing Nstream, which is 54Mbps x2, 108Mbps total. They also have an option called "Nstream Dual Slave", which, I suppose is like the MIMO, requiring DUAL antenna's. Which sucks if you have a lease on a tower only allowing a certain number of antenna's.

[WHT]

Will they let you put up a dual feed dish?

[wispwest]

I'm sure they wouldn't be able to tell the difference, we are using "3ft Parabolic Radomes". We are trying to use as as less frequencies as possible. There aren't a lot of channels open for use, we are hoping to use the 5.4Ghz frequencies. Dual antenna's on each side isn't neccessary, as we don't need more than the 54Mbps Nstream or 300Mbps MIMO anyways.

[UBNT-Mike.Ford]

Hello Wisp,

You could use SR71 with a dual polarity dish and achieve faster speeds then Nstreme with the same channel width. Will help you save channel space and push more data.

Thanks,

Mike

[wirelessrudy]

Hey does anyone know what would be best for backhaul with using only single antenna's on each side as to having to use dual? Right now we have a Mikrotik Atheros card pushing Nstream, which is 54Mbps x2, 108Mbps total. They also have an option called "Nstream Dual Slave", which, I suppose is like the MIMO, requiring DUAL antenna's. Which sucks if you have a lease on a tower only allowing a certain number of antenna's.

MT's Nstream is a complete different thing then MIMO. Read some docs on the different techniques.
MIMO will definitely improve throughputs at short distances and in high interference/signal reflections environments but it still has to prove it can outdo a properly configured PtP long range back haul link in the ´a´ band.

I would not bet on mimo for free air (fresnell!) backhauls.

If you take two dual polarity 5Ghz antenna's (2 antenna's in one housing, both connected to a radio at the same time) on both ends and use super channel (and if MT with nstream enabled, either on both separated, bonded channels, or on one dual nstream link) you can achieve throughputs in both direction MIMO won't easily beat..

I am waiting for the first success story on the wifi forums on MIMO for outdoor longrange backhaul links...
R.