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

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Nov 14 9:30 AM EST

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To: Maurice Winn who wrote (3382)	11/18/1999 10:56:00 AM
From: RoseCampion	Read Replies (2) of 13582

Furthermore, the bandwidth efficiency (complexity of the modulation scheme) supported by mobile wireless is not that high (I have not looked at the details of the HDR system, but am assuming that it uses QPSK which carries 2 bits/Hz/sec). By comparison MMDS has 120MHz to work with. The professor has forgotten more about RF than I will ever know, but still,doesn't CDMA (specifically HDR and/or the WLL versions of CDMA2000) use something 'better' than QPSK for a modulation scheme, something that gives is considerably better than 2/bits/hz/sec? If so then his conclusions are not quite as one-sided vis-a-vis VOFDM's superiority over CDMA for WLL applications. Someone please correct me if I've got this wrong. -Rose-

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