A bandpass signal with a bandwidth Bs is transmitted using a given frequency fc.
The modulated signal is received by the following receiver:
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(*LNA = Low-Noise Amplifier).
(LO generates A*cos(ωH*t) where ωH = ωC + ωIF).
They said in the notebook that this receiver is not good since it doesnt filter the mirror frequency fr
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What I dont get is where does this mirror frequency come from?
I'd be happy if you could explain it to me.
Thank you.