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Could you please help me understanding how the null sub-carriers can be used to estimate the carrier frequency offset and thus performing frequency Synchronization at the receiver?

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That depends, but usually rough frequency correction in an OFDM receiver is done by simply looking at which carriers have significant energy, which don't; you can do that, for example, by comparing the sum of all non-null carriers' energies to that of all null-carrier energies, and shifting that around until the ratio maximizes. Pretty simple idea!

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  • $\begingroup$ " you can do that, for example, by comparing the sum of all non-null carriers' energies to that of all null-carrier energies ", could you clearify this section please? $\endgroup$ – user24907 Mar 15 '18 at 18:02
  • $\begingroup$ You take the energy of samples from the null carriers. You add them up. $\endgroup$ – Marcus Müller Mar 15 '18 at 19:39

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