if I have an analog modulated signal with a DSBSC modulation (modulation index 100%) as an input in my receiver and I want to convert it to a sampled signal, do I need to demodulate the signal (with coherent detector) and then sample it ? Or the other way around?

I know that from the front end of the receiver you have an LNA, BPF, LO for getting the signal to the baseband, LPF and then is it sampling or demodulation?

  • $\begingroup$ What do you want to convert to a digital (more likely you meant a discrete-time sampled) signal? The modulated (high-frequency) signal as received? The modulating (low-frequency) signal? And how is the analog signal modulated onto the high-frequency carrier? AM DSB at less than 100% modulation? FM? PM? $\endgroup$ – Dilip Sarwate May 4 at 14:25
  • $\begingroup$ You can sample first and then demodulate digitally but you need to have an AD converter and processing system that's fast enough. $\endgroup$ – Hilmar May 4 at 14:51
  • $\begingroup$ Do a web search on "software defined radio". $\endgroup$ – TimWescott May 4 at 17:33

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