How can I determine the frequency of a transmitted signal?

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chafah zachary el 24 de Mzo. de 2014

Editada: chafah zachary el 24 de Mzo. de 2014

I am given the data file of a signal and asked to find using matlab:

i) The frequency of the transmitted signal.

ii) With help of simulation how can you distinguish the received signal from noise?

I can't figure it out.

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