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Technology Stocks : Qualcomm Incorporated (QCOM)
QCOM 174.80+0.3%Dec 5 9:30 AM EST
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To: Rajala who wrote (16857)10/22/1998 2:04:00 AM
From: freak.monster1  Read Replies (1) of 152472
 
>>Well 4 or 5 times
>>anyway (three times the number of users per base station plus
>>30%(estimated) fewer basestations because the decreased mobility
>>decreases the excess capacity needed in case users cluster).

>Oh dear.

>First of all, let's remember where the 3 x capacity advantage for
>WLL is supposed to come from: the reduced non-traffic signalling,
>such as power control etc. which is estimated to take 2/3 of CDMA1
>capacity (!) when it takes only between 1/8 and 1/16 of GSM
>capacity. We are talking about the same basic functions, nicht wahr?
>Do we all accept that CDMA1 eats bandwidth like a lewinsky with 10 x >more inefficient signalling than GSM?

Rajala, I don't know what you do or don't know about GSM, you
appear not to know much about CDMA. The capacity increase comes
from:

1. reduced near-far problem
2. stationary/psuedo stationary channel as opposed to fast
fading channel
3. no capacity loss due to mutliple sectors supporting
mulitple mobiles in soft hand-off.
4. All the above leads to much better power control, leading
to much less interference in an intereference limited system
(CDMA), which in turn leads to higher capacity.

Very little to do with signalling. In fact, WLL in CDMA
will most likely have almost identical signalling overhead (IS-95A/B).
I don't however know exactly what the capacity increase
will be. Engineer has posted some numbers.
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