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Technology Stocks : Qualcomm Incorporated (QCOM)
QCOM 174.01-0.3%Nov 14 9:30 AM EST
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To: JMD who wrote (13684)8/13/1998 5:44:00 PM
From: Clarksterh  Read Replies (1) of 152472
 
Marginally interesting article on US cell phone service in WSJ today (page B1). The author(s) tried each of the available technologies around the NYC area and found:

1) GSM provided the highest quality service, but with the least coverage.

2) CDMA provided the best split between availability and sound quality. The problems with the sound quality were, in general, slightly worse for the person listening to the user of the cell phone, but the user of the cell phone had occasional echo problems.

3) TDMA (IS-136) provided mediocre sound quality with the same type of echo problems as for CDMA. They also had some of the same asymmetry problems in voice quality as CDMA (i.e. the listener to a user of a cell phone experienced a little worse quality.) Finally, TDMA was the only service mentioned to have a problem with dropping calls.

4) iDEN (Nextel) provides service only in major metro areas, and the sound quality is pretty poor.

Clark

PS Although the asymmetry in sound quality for CDMA doesn't surprise me, the same asymmetry for IS-136 is unexpected (and I would take it with a grain of salt). Does anyone know how much less capacity the reverse link for CDMA has than the forward link (if any - there are a few more services (e.g. pager) on the forward link that may take up the extra capacity, although I tend to doubt it since they are pretty narrow bandwidth.) I.e. The forward link has 20x Amps, but the reverse is only 17x?
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