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Which of the following multiple access techniques are used by second generation cellular systems?

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Which of the following multiple access techniques are used by second generation cellular systems?

(a) FDMA/FDD and TDMA/FDD

(b) TDMA/FDD and CDMA/FDD

(c) FDMA/FDD and CDMA/FDD

(d) FDMA/FDD only

This question was addressed to me during an online exam.

I would like to ask this question from Second Generation (2G) Cellular Networks topic in chapter Modern Wireless Communication Systems of Wireless/Mobile

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The correct answer is (b) TDMA/FDD and CDMA/FDD

To explain: First generation cellular system used FDMA/FDD techniques. Second generation standards uses TDMA/FDD and CDMA/FDD multiple access techniques. 2G networks are digital.

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