Isn't the spatial diversity technique you mentioned what's used on consumer grade MIMO routers (it uses one of the MIMO radios or another)? On the backhaul type radios (with 2x2) aren't both chains running concurrently?
Greg On Apr 27, 2010, at 7:29 PM, Patrick Cole wrote: > All poles have only have a limited level of seperation. Most horizonal > and vertical dual polarised antennas only have about 30 dB of seperation > between the poles. You will notice if you use two radios of similar > frequency on different poles of these antennas it does not work well > due to the limited seperation. > > The techniques used in MIMO radios do not require absolute seperation, > just enough spatial diversity for the DSP to be able to differentiate > the signals to a point. Different polarisation certainly achieves this > goal. You could use the same polarisation from three different antennas > and still get spatial diversity. Over longer distances though it becomes > harder to differentiate the signals which is why we tend to add the > different polarisation to different antennae to increase the diversity. > > Pat > > Tue, Apr 27, 2010 at 07:15:26PM -0400, Josh Luthman wrote: > > >> Wouldn't slant effect vertical and horizontal? >> >> On 4/27/10, Gino Villarini <g...@aeronetpr.com> wrote: >>> They have 3 pol antennas available >>> >>> Dual slant and vertical >>> >>> Sent from my Motorola Startac... >>> >>> >>> On Apr 27, 2010, at 5:35 PM, "Josh Luthman" >>> <j...@imaginenetworksllc.com> wrote: >>> >>>> It's a backup. >>>> >>>> On 4/27/10, Greg Ihnen <os10ru...@gmail.com> wrote: >>>>> On 2x2 MIMO they use V and H polarization. How do they do 3x3? >>>>> What's the >>>>> third polarization? >>>>> >>>>> Greg >>>>> >>>>> On Apr 27, 2010, at 4:08 PM, Cameron Kilton wrote: >>>>> >>>>>> They just called me and made me aware that they just received >>>>>> their FCC >>>>>> cert in 5.3 and 5.4 bands. >>>>>> >>>>>> They have a 3x3 MIMO PTP product. I'll probably get a test pair to >>>>>> play >>>>>> with. >>>>>> >>>>>> The bigger news, does this mean the FCC is going to start craking >>>>>> out >>>>>> the certs again.... yippy! >>>>>> >>>>>> >>>>>> -- >>>>>> >>>>>> Thanks, >>>>>> Cameron Kilton >>>>>> >>>>>> >>>>>> --- >>>>>> --- >>>>>> --- >>>>>> --- >>>>>> -------------------------------------------------------------------- >>>>>> WISPA Wants You! 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