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What is the difference between a coherent detector and a non coherent detector?

Answer:

1Answer


A coherent detector uses the knowledge of the phase of the carrier wave to demoduleate the signal.
it's simply a product device , which multiply the AM signal by a sinusoidal signal having the same carrier frequency , followed by a low pass filter ( LPF). The product will shift the AM signal to 0 Hz and double carrier frequency , and the LPF will eliminate the later component.








2ANSWER:




Coherent detection

inCoherent detection
requires carrier phase recovery at the receiver and hence, circuits to perform phase estimation.
Sources of carrier-phase mismatch at the receiver:
inPropagationtalking causes carrier-phase offset in the received signal.
inThe oscillators at the receiver which generate the carrier signal, are not usually phased locked to the transmitted carrier.


coherent detection: Huge need for a reference in phase with the received carrier
inLess complexity compared to incoherent detection at the price of higher error rate.



Coherent ( synchronous ) detection: in coherent detection , the local carrier generated at the receiver in phase locked with the carrier at transmitter .

Non coherent ( envelope ) detection : this type of detection does not need receiver carrier to be phase locked with transmitter carrier

Contributor: Prince
First answer by Ulfpip. Last edit by Prince Dahir. Contributor trust: 1 [recommend contributor recommended]. Question popularity: 20 [recommend question].

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