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Which among the following is accomplished by sampling sub-Nyquist in wideband FFT spectrum sensing?

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Which among the following is accomplished by sampling sub-Nyquist in wideband FFT spectrum sensing?

(a) Reduction of complexity

(b) Improved signal detection

(c) Reduced power consumption

(d) Shorter time delay

I had been asked this question in an international level competition.

My enquiry is from Next Generation Wireless Network in section Next Generation Wireless Network of Cognitive Radio

1 Answer

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Correct choice is (d) Shorter time delay

Explanation: Time delay and interleaving time can be controlled by sampling sub-Nyquist and by using appropriate filters in wideband FFT spectrum sensing. The short delay simplifies compatibility with MAC layer timing.

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