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Which of the following leads to evolution of 3G networks in CDMA systems?

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Which of the following leads to evolution of 3G networks in CDMA systems?

(a) IS-95

(b) IS-95B

(c) CdmaOne

(d) Cdma2000

This question was addressed to me in an international level competition.

I'm obligated to ask this question of Third Generation (3G) Wireless Networks in section Modern Wireless Communication Systems of Wireless/Mobile

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Correct choice is (d) Cdma2000

For explanation I would say: 3G evolution of CDMA system leads to cdma2000. It is based on the fundamentals of IS-95 and IS-95B. IS-95 is a 2G standard for CDMA systems. IS-95B is a CDMA system for 2.5G networks.

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