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What is the minimum spectrum allocation required by W-CDMA?

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What is the minimum spectrum allocation required by W-CDMA?

(a) 5 MHz

(b) 20MHz

(c) 1.25 MHz

(d) 200 KHz

The question was asked during an interview.

Question is taken from 3G W-CDMA (UMTS) topic in portion Modern Wireless Communication Systems of Wireless/Mobile

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Right option is (a) 5 MHz

For explanation I would say: W-CDMA/UMTS requires a minimum spectrum allocation of 5 MHz. Using this bandwidth, it has the capacity to carry over 100 simultaneous voice calls. It is able to carry data at speeds up to 2 Mbps in its original format. 20 MHz is the bandwidth defined for LTE. CdmaOne uses a bandwidth of 1.25 MHz. GSM’s bandwidth is 200 KHz.

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