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Which modulation scheme is used by Bluetooth?

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Which modulation scheme is used by Bluetooth?

(a) DQPSK

(b) MSK

(c) GFSK

(d) BPSK

I got this question during an interview for a job.

My question comes from Bluetooth and Personal Area Networks (PANs) topic in chapter Modern Wireless Communication Systems of Wireless/Mobile

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Best answer
Correct option is (c) GFSK

The best explanation: Bluetooth uses GFSK (Gaussian Frequency Shift Keying). When GFSK is used for Bluetooth modulation, the frequency of the carrier is shifted to carry the modulation. By doing this the Bluetooth modulation achieves a bandwidth of 1 MHz with stringent filter requirements to prevent interference on other channels.

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