Brough, That’s correct, it’s absolutely NOT spatial diversity 4 stream MIMO (even though the chip can do this for other applications with more antennas). I typically refer to this “dual link” technology as frequency diversity. It is two sets of 2 streams that are channel separated but with a single coordinated MIMO baseband processor, sharing a common dual polarization antenna.
The direct benefits are: 1. Lower Power: Single baseband MIMO processor handling the 4 streams of processing, so it’s significantly less max power @ 20 Watt versus power hungry FPGAs or if we were to implement multiple discrete 2x2 chips 2. Load balancing: Dynamic load balancing of traffic across both channel sets so as interference/DFS hits one of the channel sets there’s only momentary reduction of bandwidth until a channel move can happen (and constant background spectrum analysis is pre-scanning for cleanest spectrum that has not been manually excluded by the user) 3. Improved interference immunity: It’s easier to find two smaller chunks of spectrum than one big one, and as you mentioned it is more robust with less probability of being hit by interference and losing the entire link in 2 x 20 MHz or 2 x 40 MHz modes, versus if it’s one larger single 80 MHz channel width. Cheers! Jaime Fink • Mimosa • Chief Product Officer 300 Orchard City Dr Ste 100 • Campbell • CA 95008 • www.mimosa.co<http://www.mimosa.co> This email may contain confidential and privileged material for the sole use of the intended recipient(s). Any review, use, distribution or disclosure by others is strictly prohibited. If you are not the intended recipient (or authorized to receive for the recipient), please contact the sender by reply email and delete all copies of this message. On Aug 11, 2014, at 1:50 PM, Brough Turner <[email protected]<mailto:[email protected]>> wrote: On 8/5/14 6:38 PM, Rubens Kuhl wrote: On Tue, Aug 5, 2014 at 9:49 AM, Gino Villarini <[email protected]<mailto:[email protected]>> wrote: http://www.mimosa.co/home/b5-page.html How to operate an outdoor radio with 4 spatial streams with dual-polarized antennas ? It seems I'm missing something... Rubens _______________________________________________ Wireless mailing list [email protected]<mailto:[email protected]> http://lists.wispa.org/mailman/listinfo/wireless Rubens, It appears they get their four independent streams using two polarities (H&V) of each of two channels (i.e. two different frequency bands). That should work, assuming correct channel state information (CSI) is fedback for each separate stream. Apparently Mimosa is using the Quantenna chips which are claimed to do just that, so this is very plausible (and very impressive!). Of course, this does mean finding more 5 GHz spectrum, but running two separate 40 MHz radios with MIMO is a more robust way to use 80 MHz of 5 GHz spectrum than running an 80 MHz channel directly. -- Thanks, Brough Brough Turner netBlazr Inc. – Free your Broadband! Mobile: 617-285-0433 Skype: brough netBlazr Inc.<http://www.netblazr.com/> | Google+<https://plus.google.com/102447512447094746687/posts?hl=en> | Twitter<https://twitter.com/#%21/brough> | LinkedIn<http://www.linkedin.com/in/broughturner> | Facebook<http://www.facebook.com/brough.turner> | Blog<http://blogs.broughturner.com/> | Personal website<http://broughturner.com/> _______________________________________________ Wireless mailing list [email protected]<mailto:[email protected]> http://lists.wispa.org/mailman/listinfo/wireless
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