As I know, IQ demodulation (complex demodulation) consists of three steps:

  1. Down mixing

    X(complex demodulation)(t)=X(real signal)(t).{exp⁡[(-i2π(f_demodulation).t)]}

  2. low pass filtering

  3. decimation

would you please explain what consequence would effect the demodulation procedure by implementing down mixing conversion in step1?

As a second question, when do we use complex demodulation instead of regular methods for demodulating the signal to extract specific frequencies?



  • $\begingroup$ Your question is unclear. I suggest writing down the equations for the three steps, and for the change you propose. $\endgroup$ – MBaz Apr 10 '19 at 23:26
  • $\begingroup$ Thank you for your reply. I edited my question adding more details. $\endgroup$ – Mahsa_yazdanianasr Apr 13 '19 at 4:26

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