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Which of the following the first 3G CDMA air interface?

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Which of the following the first 3G CDMA air interface?

(a) IS-95

(b) IS-95B

(c) Cdma2000 1xRTT

(d) CdmaOne

This question was addressed to me during an interview.

This intriguing question originated from 3G Cdma2000 in portion Modern Wireless Communication Systems of Wireless/Mobile

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The correct answer is (c) Cdma2000 1xRTT

To explain: Cdma2000 1xRTT is the first 3G air interface. Here, RTT stands for Radio Transmission Technology and 1x indicates that the bandwidth is one times that of the original CdmaOne channel. It is modulated on a single carrier.

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