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Technology Stocks : Winstar Comm. (WCII) -- Ignore unavailable to you. Want to Upgrade?

To: Bernard Levy who wrote (4722)	3/26/1998 6:47:00 PM
From: Bernard Levy	Respond to of 12468

One thing I forgot to mention in my previous post is that at millimeter wave frequencies, it is possible to employ highly directional antennas, so that the bandwidth available in each cell can be reused for several sectors. Say, if the cell is divided into 4 sectors, and if 4 different antennas are used to transmit to each sector, the same frequency band might be usable in each of the 4 different sectors. However, this gives rise to inter-sector interferences.

To: Bernard Levy who wrote (4722)	3/27/1998 12:30:00 AM
From: SteveG	Read Replies (1) \| Respond to of 12468

Thanks for the "bookmark" response, Bernard. Several questions: -From a symposium, I understood (from a WCII speaker) that WCII's P-MP would actually INCREASE the bandwidth over their P-P. Is this possible by some mechanism other than that which you have described, or must I have misunderstood? -Isn't there a way to increase bandwidth by using a polarity shift, or is this the difference achieved (using phase shifted sine & cosine) between BPSK to QPSK? -Are there any techniques that might allow more efficient bandwidth use than QPSK? (such as OFDM or GSPK?) -In your comment on the need for efficient bandwidth management, what role do you see ATM and QoS techniques playing? ..especially in the instantiation of the proposed ITU-R B-ISDN network. And thanks again for your very clear description of use of bandwidth. Namaste- Steve