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Technology Stocks : The New Qualcomm - a S&P500 company

QCOM 178.26

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12:08 PM EST

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To: Bux who wrote (3740)	11/29/1999 8:47:00 PM
From: Clarksterh	of 13582

Bux - . How is this frequency division solution for multi-path interference differ from QCOM's other than that it's designed to work in a fixed environment. It seems very similar in the way it uses digital signal processing to combine multi-path signals. CDMA deals with multipath by 'knowing' what the relative delay is for each of the paths. OFDM doesn't know anything - it just leaves a gap big enough that there is no uncertainty which bit it is that the user is recieving at any given time. As for OFDM somehow being capable of mobile just because it is multipath resistant, the two have very very little to do with one another. CDMA is orthogonal in code, which is time dependent. OFDM is orthogonal in frequencies. Thus time mismatches in CDMA (as almost unavoidably happens on the link from users to basestations) hurt capacity. Same with frequency mismatches (i.e. Doppler shift for moving users or bounces off of moving targets) for OFDM. Clark

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