On Mon, Aug 11, 2014 at 5:50 PM, Brough Turner <broughtur...@gmail.com> wrote:
> On 8/5/14 6:38 PM, Rubens Kuhl wrote: > On Tue, Aug 5, 2014 at 9:49 AM, Gino Villarini <g...@aeronetpr.com> > 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 > listWireless@wispa.orghttp://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. > > That's a nice way to do outdoor wireless, but that's not 4 spatial streams. To be spatial streams it needs to be in the "geometry" domain, not in the frequency domain or in the time domain. So I would not call it 4x4 MIMO. Rubens
_______________________________________________ Wireless mailing list Wireless@wispa.org http://lists.wispa.org/mailman/listinfo/wireless
