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Technology Stocks : LAST MILE TECHNOLOGIES - Let's Discuss Them Here
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To: Henk Wondergem who wrote (7113)5/26/2000 2:42:00 AM
From: Bernard Levy  Read Replies (2) of 12823
 
Hi Henk:

How much better is CDMA than TDMA? A loaded
question. For wireless voice communications,
I would say that CDMA tends to be better, but not
nearly as much as GG would claim. Advantages: a)
less susceptibility to multipath interference due
to the larger BW being used, b) more robustness to
narrowband interference, and c) more pleasant
degradation of service when the number of users becomes
large. The disadvantage is that chip complexity
is increased. In fact it will increase dramatically
if any of the multiuser CDMA receivers being discussed
by research types is ever implemented {they involve
essentially having each user decode the signals
of all the users-- a true nightmare that makes a
mockery of the original purpose of CDMA).

Note that there are major differences between wireless
CDMA and S-CDMA used by TERN. In the cable context,
total power is limited, so that as more users appear
the signal to noise ratio of existing users goes down
(I am talking here of heavy load situations), whereas
this is not the case in the wireless context.

So the CDMA/TDMA debate is medium dependent. Also,
using CDMA does not absolve companies from having
a sound business plan (exhibit #1: GSTRF, which will
probably be the first GG pick to go into Chapter 11).

Best regards,

Bernard Levy
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