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Which among the following is not a disadvantage of using OFDM?

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Which among the following is not a disadvantage of using OFDM?

(a) Complex computation is necessary

(b) Sensitive to frequency offset

(c) High peak to average power ratio

(d) Low data rate

The question was asked in an interview for job.

This is a very interesting question from Next Generation Wireless Network in section Next Generation Wireless Network of Cognitive Radio

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The correct option is (a) Complex computation is necessary

The best explanation: OFDM requires only the computation of fast Fourier transform and inverse fast Fourier transform of the signal to be transmitted. However it requires the subcarriers to remain orthogonal and exhibits a large peak to average power ratio due to the presence of complex sinusoids in time domain OFDM signals.

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