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sampling and frequency shift

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marwa mohamed
marwa mohamed 2020-8-5
I am generating a pulse signal with a very high freq and a long code length.
what i want to do is firstly to oversample this pulse signal (discrete signal) and see how this sampling will look like in frequency domain. my teacher said i can also use interp function for sampling the signal or upsample, but i still didnt get the difference between both.
then, i want to frequency shift this sampled signal by factor of 2e9, so i was thinking to multiply the signal by exp(-i*2*pi*2e9*t)
i would be grateful if someone can help me with this, since i am still confused about this.

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