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How can I determine the frequency of a transmitted signal?

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chafah zachary
chafah zachary 2014-3-24
编辑： chafah zachary 2014-3-24
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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