The New Qualcomm - write what you like thread. Message Board

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Pastimes : The New Qualcomm - write what you like thread.

QCOM 178.28

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3:59 PM EST

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To: Jon Koplik who wrote (2033)	8/30/2000 3:35:18 PM
From: S100	Read Replies (3) of 12242

Seems to be a minor error in the News article at the Korea Herald Snip Comparing the two systems, chip rate of W-CDMA is 4.097 Mcps, faster than 3.686 Mcps of CDMA2000. Snip koreaherald.co.kr This chip rate number is somewhat out of date. The WCDMA chip rate is 3.84 Mcps. It was changed quite a while ago due to FCC requirements. Snip A 10 ms radio frame is divided into 15 slots (2560 chip/slot at the chip rate 3.84 Mcps). snip See 25.201 V3.0.2 at quintillion.co.jp This site seems to have all of the WCDMA documents. V3.0.0 or higher are under change control and can be used to design a WCDMA system. The hardware specifications, 25.201 to 25.221 cover FDD and 25.221 to 25.224 cover TDD. These specifications are used to design the hardware, such as ASICs, and have been at V3 for several months. Go to quintillion.co.jp and check the documents at the bottom of the page. Snip 3) It has been shown in "IMT-2000 CDMA Chip Rate Selection," T1P1 Harmonization Ad Hoc, 98-024, August 19, 1998, Portland, OR, that even with a difficult-to-realize, complex filter, the 4.096 Mcps rate signal does not meet the FCC out of band emission requirement for a 5 MHz deployment. A 129-tap FIR filter was assumed for the WCDMA signal. The cdma2000 signal can meet the FCC requirements by using a 48-tap filter. Snip

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