Spot on; in the case of the QB8100, the third pole does not add any additional carriers or throughput directly. It does serve to improve sensitivity/receive levels due to the spatial diversity. This will help increase throughput and reliability in noisy or multipath prone environments as Tom suggests.
Tue, Apr 27, 2010 at 09:40:47PM -0400, Tom DeReggi wrote: > No because... > > they may not all get used for Transmit and Receive. > > technically, for a well designed product using some sort of time space delay > as the mechanism for seperation, having pol diversity is not necessarilly > required, as polarity is not the technique to acheive seperation. > > It also is relevent to whether the goal is to have each antenna have the > same data to improve RSSI or different data to increase speed, as if it was > the same data, it would be fine to transmit all at once. > > I do not know how Proxim is using Pols. > > I'll also mention, regarding receive, there is a benefit to receiving on all > three with spatial diversity. Slant is only 1.5db of seperation from each of > teh otehr two pols. (45 degree off pol only yeilds 1.5db loss) If one side > transmits on both H and V, the other side would use multiple RX antennas as > mechanism to hear more reflection to combine into the signal for better > gain, and the Slant would hear both the Vert and Hor pols. So if the > Verticle got killed by multipath or some other RF barrier, and Horizontal > made it through, the Horizontal and Slant antennas would both optimally hear > the Horizontal singal within 1.5 DB, and be combined to assist gain. I do > not know that this method is the best use of 3x3, but it is one possible use > of 3 poles. > > . > > Tom DeReggi > RapidDSL & Wireless, Inc > IntAirNet- Fixed Wireless Broadband > > > ----- Original Message ----- > From: "Gino Villarini" <g...@aeronetpr.com> > To: "WISPA General List" <wireless@wispa.org> > Cc: "WISPA General List" <wireless@wispa.org> > Sent: Tuesday, April 27, 2010 5:36 PM > Subject: Re: [WISPA] Proxim QB 8150 > > > > 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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