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Technology Stocks : Winstar Comm. (WCII) -- Ignore unavailable to you. Want to Upgrade?

To: DownSouth who wrote (11645)	11/17/1999 2:30:00 PM
From: Bernard Levy	Read Replies (2) \| Respond to of 12468

Hi DownSouth: I do not see QCOM's CDMA HDR offering and CSCO's VOFDM as competing head to head. Here is why: QCOM's system will be operated out of a PCS block. Such blocks have from 15 to 25 MHz of bandwidth. 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 fixed configuration allows also higher order modulation, and in the case of VOFDM a high degree of space selectivity through the use of antenna arrays. So it is easy to see that the total information carrying capacity of VOFDM operating in the MMDS band will be much larger than HDR. So, QCOM's system will be highly flexible because of its support of mobility, but people using a wireless access solution from their homes will be better served by VOFDM. Best regards, Bernard Levy PS: I have better study the HDR system more closely. Wireless technology is moving too fast.