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How much increase in spectral efficiency is provided by W-CDMA in comparison to GSM?

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How much increase in spectral efficiency is provided by W-CDMA in comparison to GSM?

(a) Two times

(b) Three times

(c) No increase

(d) Six times

This question was posed to me in an interview for internship.

This question is from 3G W-CDMA (UMTS) topic in division Modern Wireless Communication Systems of Wireless/Mobile

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Right answer is (d) Six times

To explain: W-CDMA can provide at least six times an increase in spectral efficiency over GSM at system level. Such a wider bandwidth is chosen to higher data rates as low as 8 kbps to as high as 2 Mbps on a single 5 MHz W-CDMA radio channel.

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