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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)10/21/1998 12:59:00 PM
From: Clarksterh  Read Replies (1) of 152472
 
Rajala - Comparison of D-AMPS vs CDMAOne capacity

I decided to go back through my Qualcomm documentation, and although I still could not find voice channels/carrier in the spec's, I did find a very interesting description in the Economic Report: Fixed Wireless Networks sent to me with the specs (teach me not to read all 200 pages of documentation):

"In mobile networks, CDMA capacity is usually 3 or 4 times greater than D-AMPS for a single site. When the users are fixed in a network, the capacity of CDMA is typically 6 or 7 times greater than D-AMPS for a single cell site. The cell capacity increases because fixed subscribers create a lower level of interference and a more stable power control environment than mobile users, allowing a greater number of users to coexist within a single RF carrier for CDMA WLL. In a mobile CDMA network from Qualcomm, 24 calls per sector per carrier are possible. In a fixed network, the capacity increases to 45 users per sector per carrier."

Note that this disagrees with QTelWatcher's documentation, but it is quite possible that things have been improved since I last did a survey (1 yr ago).

Clark

PS On the issue of range, 6 miles is probably a good conservative estimate. The Qualcomm documentation gives Urban=8.4 miles, Suburban = 23 miles and Rural = 34.5 miles.

PPS On the matter of spec's. I find it mildly annoying that the specs sent out are more a glossy brochure than a true spec, but Qualcomm is not alone in this. In fact, once I got Qualcomm to send me documentation they sent me much more complete documentation than anyone else (it might be possible to read into this that the other technologies aren't as willing to make economic comparisons). They even sent me a bunch of documentation in Russian <g>.
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