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Technology Stocks : Qualcomm Incorporated (QCOM)

QCOM 163.33

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To: engineer who wrote (29469)	5/9/1999 8:04:00 PM
From: Clarksterh	Read Replies (1) of 152472

Engineer - YOu should know that Walsh codes are only orthogonal if they are synchronous. the probolem is that the system assumptions break down when you got asynch Walsh codes. There are lots of different kinds of 'synchronous'. I do not believe W-CDMA is proposed to be asynch at the chipping or even bit level (they maintain synch at this level with the BS sending out bits to all users at the same time and thus orthogonality will be maintained). They only propose that the MT and BS do not need to maintain a link when there is no data being transmitted. CDMAOne, in contrast, maintains a low rate link at all times when 'connected' and thus does not need to relock with every new data burst. Note that this somewhat conjecture based on the W-CDMA spec (which, as Walt has said many times, is far from clear) and looking at GoldenBridge's documentation, but I think it is accurate. This scheme would allow them to save some fairly small amount of power and bandwidth for really bursty data like Web surfing, but at the expense of complexity and perhaps some loss of capacity for less bursty data like voice. FWIW. Clark

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