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Technology Stocks : Qualcomm Incorporated (QCOM)

QCOM 163.33

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To: Ramus who wrote (29431)	5/8/1999 6:04:00 PM
From: quidditch	Read Replies (2) of 152472

Part II: Also, as I understand the dialogue on the matched filters/aynchronous signal issue--is the asynchronicity attributable precisely to the TDMA elements (burst of power/signal as part of time division), whereas CDMA mode is at a constant (and lower) power output and does not need that kind of filtering, or has TD nothing to do with this? Also, is the relative spectrum inefficiency of W-CDMA attributable to the hybridization of TD/CD, or for other reasons? (I read carefully the first para from your response to me, quoting the ETSI UTRA W-CDMA proposal to ITU. I would assume, but don't know, that CDMA2000 also has a maximum number of orthogonal [downlink] channels available and must use a certain number of those for control channels/system management. It's the last sentence of the quoted text of the proposal whose import escapes me: <The reason why the maximum number of channels in TDD is only 50% of that in FDD is the UL/DL sharing of one 5 MHz carrier in TDD."> Does this not occur in CDMA2000?). Anyhooo, I'm trying to expand my understanding. Sorry to bother you. Thank you. (PS, do you have the medved link?) Best regards. Steven

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