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yo3gjc
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802.11n 3x3 with 3SS

Thu Apr 19, 2012 2:33 am

Any plans to release point to point 450Mbps with a 3x3 with 3 Spatial Stream? Looking 4ward for this
Tnx
 
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dasiu
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Re: 802.11n 3x3 with 3SS

Sat Apr 28, 2012 11:37 am

Any plans for a triple polarization antenna? :twisted:
In free space, for outdoor links (in Line Of Sight scenario) the spatial streams are different polarizations :). That's the only way to send/receive 2 different signals on the same frequency. And you can have only two orthogonal (totally different from each other) polarizations - either two linear (one horizontal and one vertical) or two circular (one CW and one CCW). Any other polarization would be just a combination of those two.
So - physically, for an outdoor LOS radio link, only 2 streams can be used. In an indoor environment we have multipath propagation, and maaany different streams without using different polarizations (just the antennas shouldn't be too close, one wavelength margin is sufficient) - so we can do 3x3, 4x4, 5x5 etc. (if we have a powerful enough chipsets to do the space-time coding/decoding).
Hope you enjoyed the lecture ;).
 
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Re: 802.11n 3x3 with 3SS

Sat Apr 28, 2012 6:22 pm

The Atheros 3x3 chipset supports beamstearing, which I don't think is going to work with dual polarity.

I am looking for a 3x3 card myself for an experiment.

I think Compex makes one, but it is mini PCIe.
 
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czolo
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Re: 802.11n 3x3 with 3SS

Wed May 02, 2012 4:35 pm

Any plans to release point to point 450Mbps with a 3x3 with 3 Spatial Stream? Looking 4ward for this
Tnx
If you looking for something like this, maybe this will be interested for you:
http://www.cyberbajt.pl/cms.php?get=produkt,4334
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czolo
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Re: 802.11n 3x3 with 3SS

Wed May 02, 2012 4:42 pm

Any plans for a triple polarization antenna? :twisted:
In free space, for outdoor links (in Line Of Sight scenario) the spatial streams are different polarizations :). That's the only way to send/receive 2 different signals on the same frequency. And you can have only two orthogonal (totally different from each other) polarizations - either two linear (one horizontal and one vertical) or two circular (one CW and one CCW). Any other polarization would be just a combination of those two.
So - physically, for an outdoor LOS radio link, only 2 streams can be used. In an indoor environment we have multipath propagation, and maaany different streams without using different polarizations (just the antennas shouldn't be too close, one wavelength margin is sufficient) - so we can do 3x3, 4x4, 5x5 etc. (if we have a powerful enough chipsets to do the space-time coding/decoding).
Hope you enjoyed the lecture ;).
Look at LTE technology, there is MIMO 4x4 - so it's possible to have system with more than 2x2 in outdoor links.
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| http://wifi4eu.pl
| Innovation in WiFi
 
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czolo
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Re: 802.11n 3x3 with 3SS

Wed May 02, 2012 4:43 pm

The Atheros 3x3 chipset supports beamstearing, which I don't think is going to work with dual polarity.

I am looking for a 3x3 card myself for an experiment.

I think Compex makes one, but it is mini PCIe.
You can try this card:
Image
It's cheap card with AR9380 chip.
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coffeecoco
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Re: 802.11n 3x3 with 3SS

Wed May 02, 2012 4:44 pm

why cant i find the english version of that, i changed the site to english only but the product vanished

trying to work out what they done here
 
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czolo
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Re: 802.11n 3x3 with 3SS

Wed May 02, 2012 4:51 pm

why cant i find the english version of that, i changed the site to english only but the product vanished

trying to work out what they done here
I don't know why there is no information in english :/ Maybe ask them with e-mail.
I've found information about their 3x3 antenna:
http://www.cyberbajt.com/en/shop_item/3 ... o_3x3.html

Here is some sample, how this antenna can work:
You do not have the required permissions to view the files attached to this post.
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