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Technology Stocks : Qualcomm Incorporated (QCOM)
QCOM 174.01-0.3%Nov 14 9:30 AM EST
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To: Mika Kukkanen who wrote (19304)12/8/1998 12:21:00 PM
From: Valueman  Read Replies (2) of 152472
 
From QCOM's paper on 3G--note comment about this compromise chip rate:

The analysis for the 3.6864 Mcps based wideband CDMA system permits the deployment of five wideband CDMA carriers in a 20 MHz x 2 band allocation, with a minimum guard band of 250 kHz on either side of the band. The choice of a 4.096 Mcps chip rate on the other hand allows for only four wideband CDMA carriers in the same 20 MHz allocation, with no guard band at all. In fact, there is significant concern that provisioning four carriers will overlap the edges of the 20 MHz band, potentially causing interference in the adjacent band.

In countries where cdmaOne (TIA/EIA-95) deployments exist, the operators could mix the wideband channel with the standard band 1.25 MHz channels, enabling them to provide a greater mix of differentiated voice and data services. In the 15 MHz x 2 band allocation (used in Region 2 and under consideration for new allocations in some countries), choosing 3.6864 Mcps allows the operator to fit three wideband CDMA carriers and additional standard band CDMA carriers. Choosing 4.096 Mcps yields the capability to support at most three wideband carriers.

A "compromise" chip rate, 3.84 Mcps, has also been proposed. This change from 3.6864 Mcps is driven by the advocates of competitive disadvantage, and this change would achieve their goal without providing any technical advantage. Thus, it is not a compromise. The 3.6864 Mcps chip rate has true claim for acceptance in the converged standard because it builds on the 100 million or more CDMA subscribers expected by the time IMT-2000 services are offered commercially, currently targeted for 2002.

The choice of chip rate has also been incorrectly linked by some opponents of convergence to the issue of Intellectual Property Rights (IPR). This linkage is erroneous and misleading since the selection of the chip rate does not make QUALCOMM's IPR any more or less applicable. Dual chip-rate options have also been discussed to resolve the political issue of chip rate selection. A dual chip rate option unnecessarily complicates the implementation of the handset.

Conclusion: QUALCOMM urges the adoption of the 3.6864 Mcps as the single chip rate for the converged standard.
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