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Which among the following is not a limitation of employing FFT?

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Which among the following is not a limitation of employing FFT?

(a) Wideband ADC is required

(b) Restriction on bandwidth

(c) Increased energy demand

(d) High delay

I had been asked this question during an interview for a job.

Origin of the question is Next Generation Wireless Network in division Next Generation Wireless Network of Cognitive Radio

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Correct option is (d) High delay

Easy explanation: FFT operation demands wideband ADC and extensive digital signal processing. The ADC imposes restrictions on the instantaneous bandwidth. The energy usage is increased due to the high amount of digital signal processing.

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