Heads up thread - Jack made a new list for 3.650 topics specifically. On 9/12/09, Chuck Bartosch <ch...@clarityconnect.com> wrote: > Tom, > > 802.16d implementations can and do support diversity antennas on the > AUs. > > I don't know the definitive answer to the rest of the question. But I > do know that: > > (1) Clients in 802.16e can and do support diversity > > (2) The clients are supposed to be interoperable > > (3) I know of no clients that support diversity in 802.16d > > So, speculatively, the point might that 802.16e clients support > diversity and interoperate. > > You pick up at least a few db with client diversity antennas-though > not nearly enough to make up for the lower power regime you have to > operate in. > > Chuck > > > > On Sep 11, 2009, at 7:12 PM, Tom DeReggi wrote: > >> Patrick, >> >> Always great to see your list posts filled with good info. Responses >> inline... >> >>> The E standard does enable use of diversity, but it comes at a high >>> cost >>> and is of limited benefit for rural operators. The truth is that >>> diversity is designed to increase link budgets to support self- >>> install. >> >> Can you clarify? Are you saying D Spec does not support Diversity? >> Or that most D vendors focusing on price chose not to include >> implementation >> of it? >> >> Even most Wifi chipsets supports diversity. >> >> My understanding was D supported diversity, because the early Pre- >> Wimax >> Aperto supported all types of Diversity. >> Please clarify. >> >> I'd like to add... I'd like to see more FIXED products support >> Diversity at >> the AP. >> Trials have shown that Polarity diversity yielded much better >> results than >> Spacial diversity for NLOS. BUT, that data does not consider spectrum >> availabilty and congestion. >> Many Metro deployments can't afford to waste a polarity, with limited >> spectrum and lots of noise, and forced to abandon the idea of Polarity >> diversity. >> Spacial Diversity at teh AP is an enhancement that can be used >> without any >> trade-off other than Colo fees if can't avoid paying colo per antenna. >> Actually in newer MIMO designs Spacial Diversity on its own showed >> signficant improvements in range. >> This could becaome even more important in 3.65 with few channels. >> >>> Basically, each standard has its place, E is for people in 2.5 GHz >>> doing >>> self-install, like Clearwire, and we all know the low service >>> (especially low upstream) packages offered in Clearwire's service. >>> D is >>> better and cheaper for rural fixed operators, and especially for >>> public >>> safety video type networks and definitely for voice-centric users. >>> D is >>> better for enterprise, where many users sit behind the CPE. E is >>> better >>> for roaming individual users with modest expectations. >> >> I'd agree. And I'd agree "D" is most appropriate for most WISPs. >> >> I think the biggest factor in deciding though isn't technology specs? >> People want to pick the technology with the longest life span. >> Many WISPs might prefer D, but are afraid D might be discontinued >> sooner, >> since the big dollar might have followed E. >> Just like is happening right now. >> I think the number one factor that will lead WISPs to pick D is >> acknowledgement that Vendors understand and see the long term >> potential and >> MArket for D, so we can be confident about our vendors. >> So far, I think the primary vendors have done a good job showing their >> supprot for D. >> >> The other number 1 barrier to WiMax is price, so once again many >> have chosen >> D for price reasons. >> But that is a fake benefit, because technically there is no reason >> that E >> product couldn't be sold just as Cheap if it came down to it. >> If anything, E has the potential to drop to lower prices, because of >> economy >> of scale and diverse use for WiMax chipsets. >> >> So what I'm saying is... Wimax E is killing themselves by pricing >> their >> products to high. Right now D has the potential to regain its market >> share >> because its price advantage. >> However, one good way for E to protect its market share is to try and >> influence the discontinuation of D. >> Thus important to support the continued development of D. >> >> Tom DeReggi >> RapidDSL & Wireless, Inc >> >>> We'd like to hear your opinions, and if you like to discuss this >>> with us >>> while at 4G World, please drop me a note. >>> >>> Regards, >>> >>> Patrick Leary >>> Aperto Networks >>> >>> >>> Patrick Leary >>> Aperto Networks >>> 813.426.4230 mobile >>> >>> >>> -------------------------------------------------------------------------------- >>> WISPA Wants You! 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