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To: ftth who wrote (5338)	9/24/1999 7:39:00 AM
From: Dan B.	Respond to of 12823

<gg> Thanks Dave. <gg> May all technologies improve in the future. Surely that implies the risk or reward here. Dan B

To: ftth who wrote (5338)	9/24/1999 1:34:00 PM
From: Bernard Levy	Respond to of 12823

Dave and Dan: My 2 cents on your interesting exchange about the differences between wireless CDMA and SCDMA for cable: one subtle difference is that for wireless CDMA, the processing gain is achieved by letting new users join with the same power as existing users. This is because the medium does not impose any total power constraint. Unfortunately, cable has a total power constraint, so that as new users log on, existing users need to lower their power, which decreases the processing gain. Thus, noise immunity over congested SCDMA systems should fall well below what wireless CDMA can offer. On the other hand, I believe that TERN may be able to achieve slightly higher upstream transmission rates over HFC upgraded plants than over non-upgraded plants,. This would be done by spreading 32- or 64-QAM signals, instead of 16-QAM. However, I am not sure if a modulation order has been selected yet for DOCSIS 1.2. Yet, I expect DOCSIS 1.2 will not meet with much enthusiasm, since cable operators will probably be exhausted after the push towards 1.0 compliance. Best regards, Bernard Levy