For a OFDM signal, after DAC with 12.5Gsa/s sampling rate, what is the bandwith?  How to calculate?

If the OFDM signal with Hermitian symmetry, what is the bandwith? The Hermitian symmetry will reduce the bandwith?

For a OFDM signal with DAC sampling rate of 12.5Gsa/s, after ADC with 25Gsa/s, what is the bandwith? After down converter, what is the bandwith?

I'm very  confused by the  bandwith calcluation of the OFDM signal? How to calcluate the bandwith?

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