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Technology Stocks : Qualcomm Moderated Thread - please read rules before posting -- Ignore unavailable to you. Want to Upgrade?

To: Clarksterh who wrote (23278)	6/1/2002 12:08:23 AM
From: pheilman_	Respond to of 196657

Clark, The E-OTD requires additional stationary receivers, just for location services, that don't carry traffic. These are the LMUs, the scheme must warm the hearts of network providers everywhere. To quote from the white paper you referenced: "Because E-OTD must interact with at least three base stations an utilize terrestrial measurement to derive a position estimate, the technology is vulnerable to accuracy degradation from multipath and signal reflections, and will fail completely in areas where there are too few BTSs, such as rural areas. This situation is worsened by the fact that, although BTSs are placed in specific spots to optimize communication efficiency, these spots may be poor choices for use in deriving position estimates. For example, an MS in a line with several BTSs can produce ambiguous results, so the technology may operate unreliably along linear road networks where this BTS configuration relative to the MS may be common." snaptrack.com In other words, it won't work along a road and multipath will confuse it. Of course Snaptrack has a strong bias against E-OTD. I still think the underlying bandwidth limitations should degrade the accuracy to an unacceptable level. Can't get accurate timing through a band limited channel. Gee, how ever will AT&T pass the testing? Paul