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To: Bernard Levy who wrote (10418)	2/10/2001 8:27:54 PM
From: axial	Respond to of 12823

Hi, Bernard - "Several of the systems (VOFDM and the system proposed by Iospan) do not require LOS." And antenna diversity? Do they require multiple antennas to do non-LOS? What would minimum antenna spacing be at 10 GHz? At 2.4 GHz, how many meters apart? Nomadic usage? Mobile usage? Will MIMO-OFDM and V-OFDM overcome the problems of a bad fresnel zone, or would a repeater still be required? For the rural ISP, what are the tradeoffs? Transfer (sometimes), the costs of adequate transmission/reception to the user, or keep the CPE cost low, and go with repeaters? Regards, Jim

To: Bernard Levy who wrote (10418)	2/11/2001 2:18:04 AM
From: axial	Read Replies (1) \| Respond to of 12823

Emphasis added... "Troy Trenchard, director of product marketing at Cisco, believes that, despite the commonly used phrase, there is no such thing as non-line of sight. "Nobody can send a signal through a mountain. Whenever anybody says non-line of sight there's a layer below that" relating to power level, frequency shifting if there is reflection, what kind of service is being transmitted at what rate, and many other factors, he says. "We have the first shipping OFDM system that can handle obstruction which is near non-line of sight. We can go through foliage; we can reflect signals to get around obstructions." xchangemag.com