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What is the chip rate of W-CDMA?

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What is the chip rate of W-CDMA?

(a) 1.2288 Mcps

(b) 3.84 Mcps

(c) 270.833 Ksps

(d) 100 Mcps

I got this question during an interview.

This intriguing question comes from 3G W-CDMA (UMTS) in portion Modern Wireless Communication Systems of Wireless/Mobile

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Correct answer is (b) 3.84 Mcps

The explanation is: W-CDMA uses a chip rate of 3.84 Mcps. Chip rate is the product of symbol rate and spreading factor. If the symbol rate is 960 Kbps and spreading factor is 4 for W-CDMA, then the chip rate is 3.84 Mcps. The chip rate for Cdma2000 and GSM are 1.2288 Mcps and 27.0833 Ksps respectively.

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