New answers tagged sdr
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Software-defined radios do quadrature sampling: every sample is actually two, a real (in-phase) sample and an imaginary (quadrature) sample. That's why sampling rate is equal to the bandwidth.
You can't sample a signal with bandwidth 20 MHz at 4 MHz; doing so would introduce lots of aliasing. The maximum signal bandwidth you can sample at that rate is 4 MHz (...
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