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Which of the following scheme is used by Bluetooth?

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Which of the following scheme is used by Bluetooth?

(a) Frequency hopping TDD scheme

(b) Frequency hopping FDD scheme

(c) DSSS TDD scheme

(d) DSSS FDD scheme

This question was addressed to me during an online interview.

This is a very interesting question from Bluetooth and Personal Area Networks (PANs) in chapter Modern Wireless Communication Systems of Wireless/Mobile

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Right choice is (a) Frequency hopping TDD scheme

To explain I would say: Frequency hopping TDD (Time Division Duplexing) scheme is used by Bluetooth. Frequency hopping provides a form of multiple access among co-located devices in different piconets.

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