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Technology Stocks : Qualcomm Incorporated (QCOM)

QCOM 163.84

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To: Ramus who wrote (29405)	5/7/1999 11:21:00 AM
From: quidditch	Read Replies (1) of 152472

Walt: I had been wondering about Darrel's question too. Also, in your post to Bux (20261), you wrote (in the context of the "overlay" of CDMA on GSM): <...The method of modulation for instance is QPSK not MSK so W-CDMA in no way represents a directly compatible air interface for GSM. The compatibility is only in timesharing and certain other timing related issues. I might add that this is far different from IS-95 and CDMA-2000 compatibility. Where IS-95 protocol is a subset of 1XRTT in 3G and will integrate very smoothly with it. Afterall, it's CDMA to CDMA, not TDMA to CDMA. I know, you think that W-CDMA must be superior to CDMA-2000 in overlaying a GSM system. Sorry but not true. As I said W-CDMA proposes using a 1/2 capacity TDMA mode to overlay GSM systems. IS-95 has demonstrated overlay of GSM systems and the economics involved. This overlay would be a much more economically viable upgrade path for GSM operators looking to move up to 3G services.> If you have the time: In addition to W-CDMA's relatively inefficient use of the spectrum, wouldn't the "1/2 capacity TDMA mode to overlay" affect signal accuracy and/or spectrum efficiency, or is the spectrum usage inefficiency attributable to precisely this hybrid system? Also, could you explain how the TDMA "survives" (at least half-way) within the context of a CDMA air interface? Can PM if you wish. Btw, truly impressed with your mastery. Reading your posts referenced by JGoren shed new depth of meaning for me on the extent of the Ericy spin doctoring, arrogance and hubris. Regards and thank you. Steven

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