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BobY777
06-10-2005, 10:39 PM
Are any WISPs using MIMO technology?

That technology really does seem to work to give greater range, without the need for brute force power.

But it does need 3 antennas, I believe. For instance Belkin has a MIMO router, with 3 antennas. I believe Linksys does also (3 antennas).

I figured that with the need to have greater range, that a some WISPs must be using this technology.

MIMO seems to help out in places with obsticals and reflections. But probably wouldn't help out in line of sight situations.

That makes me wonder if the Wi-Fi Plus antennas (with multipolarity), operates similiar to MIMO.
golfnut
06-11-2005, 11:15 AM
Bob,

Keep in mind that you can't remove the antenna's on any MIMO products so it probably wouldn't work in a WISP situation.

MIMO should only be used for range and speed requirements indoors as a last resort.

Greg
BobY777
06-11-2005, 01:39 PM
Hi Greg:

Thanks for the post.

I know on the Belkin the antennas can't be removed, but I wonder if they can be removed on other manufacturer's MIMO products?

I don't think MIMO products have client to client isolation though, which would be needed in WISP operations...plus BW control, etc.

You mentioned that MIMO should be used indoors as a last resort. Why as a last resort?

That MIMO really works.

I have a next door neighbor who has a Belkin indoors. I have a 12 dBi antenna on my chimney (about 40 feet high)...using a 200 mW Senao.

When I drive my van about a block away, I can pick up the Belkin almost as strong as I can my AP...and mine is outside and running 200 mW. So that MIMO does seem to work...quite well. In a few locations, his Belkin is stronger then my AP.
golfnut
06-11-2005, 02:15 PM
Because of the technology, there aren't any MIMO products that have removable antenna's.

I mentioned last resort because we've seen some compatibility issues with client devices.

802.11n is not a standard yet...

Greg
ConnClark
06-13-2005, 11:05 AM
MIMO relies on specific spacing and timing of signal between the antennas. Since you can't ensure these specs will be maintained with an external antenna, an external antenna isn't an option.

have fun,

Conn Clark
keenanj
06-17-2005, 06:45 AM
The best bet for wisps is to use high power 200mW access points with directional or sector antennas. Mimo is a short range technology at this point.