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Technology Stocks : Qualcomm Incorporated (QCOM)

QCOM 161.26

-2.9%

2:10 PM EST

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To: Jon Koplik who wrote (13392)	8/6/1998 2:55:00 AM
From: Clarksterh	Read Replies (3) of 152472

John - Adaptive Array Antennae are not as weird as they sound. The way it would work in a cell phone system is that the 'normal' antennae you currently see on base stations would be replaced with something not much larger (if it is larger at all) but which was made up of lots of small antennae. The beam can then be directed any direction the equipment decides without moving the antenna at all. This is done by delaying the signals out of some small antennae more than for others. Similarly it is possible to know where each user is by using the slight delay in signal reception for one small antenna vs another. For a simple signal which is on all the time, and has its own frequency it is a simple matter to tie the two pieces of info together, and thereby 'point' the antenna (which is really an agglomeration of antennae). However it gets more difficult for a signal where all of the signals are right on top of one another (Among other things you need to be simultaneously 'pointing' it in many different directions.) Clark PS For those who decided too late in life that they really wanted to be a technogeek, the principle behind an adaptive array antenna is easy to demonstrate. Get a really flat baking sheet, and put it on a flat surface. Now fill it with 1/8" or so of water. Plunk two fingers into the water at the same time. The wave goes straight away from your fingers. Now delay one finger by a really small amount of time (e.g. 1/4 sec). Lo and behold, the wave moves away from your fingers at an angle. PPS Note that Adaptive Array Antenna are not really new technology except in the concept of cell systems. The military has been using them, especially for radar, for a long time.

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