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Digital Communications question?
What is the difference between coherent and incoherent detection?
Yes, very helpful. So I'm guessing for what I am doing, (solving homework problems), for a narrow band signal, it means use the equivalent low-pass signal for the demodulation. Thanks.
1 Answer
- Robert_WLv 51 decade agoFavorite Answer
I'd prefer the terms non-coherent and demodulation.
The clearest difference is that non-coherent demodulation requires no knowledge of the carrier's characteristics. Amplitude detection of AM is one case. Just detect the carrier envelope & you're done.
Coherent detection requires the carrier or regeneration of the carrier to demodulate the signal. e.g. mixing a FM signal with an oscillator locked to the carrier freq will result in the modualton as the output "error" signal.
Does that help?
